- Comp-phys-alps-users - lists.phys.ethz.ch

linux and ALPS
by Bo-Nan JIANG 17 Mar '13

17 Mar '13

Hi,all We have a problem of choosing Linux operating system for our server. We want a system in which ALPS can work well and stably, but Ubuntu 12.04 is not very stable on our server. So, please give us a little advice that which kind of Linux system is suitable for ALPS? Bo-Nan Shanghai Institute of Fine and Optical Mechanics, C.A.S. -- Stay foolish,Stay hungry.

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conserved quantumnumber in spin_one_half of ALPS tutorials "dmrg-01-dmrg"
by Bo-Nan JIANG 16 Mar '13

16 Mar '13

Hi, all the parameter file of spin_one_half of ALPS tutorials mentioned is, LATTICE="open chain lattice" MODEL="spin" CONSERVED_QUANTUMNUMBERS="N,Sz" Sz_total=0 J=1 SWEEPS=4 NUMBER_EIGENVALUES=1 L=32 {MAXSTATES=100} but, in the MODEL "spin" in ALPS models.xml, no such quantum number "N" is defined. So the question is why there is a non-existing quantum number showing up in the CONSERVED_QUANTUMNUMBERS="N,Sz" ? Bo-Nan -- Stay foolish,Stay hungry.

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sparsediag in Kondo lattice
by Bo-Nan JIANG 16 Mar '13

16 Mar '13

Hi,all I am trying to sparsediag the Kondo lattice in ALPS, but the command line return "Called get_quantumnumber with illegal index". I feel that there may be a misunderstanding of the constraint in my code, but I just can not find it out now. So, dear users and developers please help me!!! The parameter file is, LATTICE="chain lattice" MODEL="Kondo lattice" LATTICE_LIBRARY="mylattices.xml" MODEL_LIBRARY="mymodels.xml" CONSERVED_QUANTUMNUMBERS="Sz" Sz_total=0 t=1 J=2 {L=4} the "Kondo lattice" code in mymodels.xml is almostly copied from the "Kondo lattice" code in ALPS models.xml, the "only" change I made (no changes of sitebasis, operators or hamiltonian) is adding a constraint of the total Sz (Sz_spin+Sz_fermion) to the BASIS as shown below: <BASIS name="Kondo lattice"> <SITEBASIS type="0" ref="fermion"/> <SITEBASIS type="1" ref="spin"/> <CONSTRAINT quantumnumber="Sz" value="Sz_total"/> </BASIS> The lattice in mylattices.xml is defined as: <LATTICES> <LATTICE name="chain lattice" dimension="1"> <PARAMETER name="a" default="1"/> <BASIS><VECTOR>a</VECTOR></BASIS> <RECIPROCALBASIS><VECTOR>2*pi/a</VECTOR></RECIPROCALBASIS> </LATTICE> <UNITCELL name="hf" dimension="1"> <VERTEX type="0"/> <VERTEX type="1"/> <EDGE type="0"><SOURCE vertex="1" offset="0"/><TARGET vertex="1" offset="1"/></EDGE> <EDGE type="1"><SOURCE vertex="1" offset="0"/><TARGET vertex="2" offset="0"/></EDGE> </UNITCELL> <LATTICEGRAPH name = "chain lattice"> <FINITELATTICE> <LATTICE ref="chain lattice"/> <PARAMETER name="L" default="4"/> <EXTENT size="L"/> <BOUNDARY type="periodic"/> </FINITELATTICE> <UNITCELL ref="hf"/> </LATTICEGRAPH> </LATTICES> where VERTEX type=0 stands for fermion and VERTEX type=1 stands for spin. Any advice is welcome! Bo-Nan -- Stay foolish,Stay hungry.

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Kondo lattice DMRG input file
by Bo-Nan JIANG 16 Mar '13

16 Mar '13

Hi,Matt This is the input parameter file with your ALPS Kondo lattice model, the DMRG parameters are chosen so that the calculation can finish in a short time, thus be easy to be debugged : --------------------------------INPUT PARAMETER FILE (FILE NAME my_parm)----------------------------------------- LATTICE_LIBRARY="my_lattices.xml" LATTICE="chain lattice" MODEL="Kondo lattice" mu=0 t=1 J=0.2 {L=32 SWEEPS=4 MAXSTATES=40 NUMBER_EIGENVALUES=2} -----------------------------END OF INPUT PARAMETER FILE--------------------------------- -----------------------------my_lattices.xml-------------------------------------------------------------- <LATTICES> <LATTICE name="chain lattice" dimension="1"> <PARAMETER name="a" default="1"/> <BASIS><VECTOR>a</VECTOR></BASIS> <RECIPROCALBASIS><VECTOR>2*pi/a</VECTOR></RECIPROCALBASIS> </LATTICE> <UNITCELL name="fermion" dimension="1"> <VERTEX type="0"/> <VERTEX type="1"/> <EDGE type="0"><SOURCE vertex="1" offset="0"/><TARGET vertex="1" offset="1"/></EDGE> <EDGE type="1"><SOURCE vertex="1" offset="0"/><TARGET vertex="2" offset="0"/></EDGE> </UNITCELL> <LATTICEGRAPH name = "chain lattice"> <FINITELATTICE> <LATTICE ref="chain lattice"/> <PARAMETER name="L" default="4"/> <EXTENT size="L"/> <BOUNDARY type="open"/> </FINITELATTICE> <UNITCELL ref="fermion"/> </LATTICEGRAPH> </LATTICES> -------------------------END OF my_lattices.xml---------------------------------------- -------------------------COMMAND LINE INPUT----------------------------------------- parameter2xml my_parm dmrg --write-xml my_parm.in.xml ------------------------END OF COMMAND LINE INPUT------------------------------- ERROR: site basis for type 2 not found. Hope you guys can find out what is going on. By the way, if I use wild card and my custom fermion code to reprogram Model="Kondo lattice" in the fashion of your ALPS Model="spin", the DMRG and ED both works. But the problem is with mu=0 t=1 and J=1, by DMRG, my custom Kondo Lattice model shows the gap = 0.21, with 10^-10 truncation error, while K.Ueda in Phys.Rev.B. 46, 3175 FIG.1 shows a energy gap smaller than 0.2 under the same parameter condition by ED. (BOTH HALF FILLING) I recheck my custom Kondo lattice model and find no obvious mistakes. And I do not know why, can you help me here, too? --------------------------INPUT FILE OF CUSTOM KONDO LATTICE MODEL------------------------------ LATTICE_LIBRARY="my_lattices.xml" LATTICE="chain lattice" MODEL_LIBRARY="my_models.xml" MODEL="Kondo lattice" CONSERVED_QUANTUMNUMBERS="N" N_total=128 MEASURE_LOCAL[local density]=n local_max0=2 local_min0=0 local_max1=1 local_min1=1 mu=0 t=1 J=1 {L=64 SWEEPS=10 MAXSTATES=500 NUMBER_EIGENVALUES=2} ------------------------CUSTOM KONDO LATTICE MODEL-------------------------- <MODELS> <SITEBASIS name="fermion"> <PARAMETER name="local_maximum" default="local_max"/> <PARAMETER name="local_max" default="2"/> <PARAMETER name="local_minimun" default="local_min"/> <PARAMETER name="local_min" default="0"/> <QUANTUMNUMBER name="N" min="local_minimum" max="local_maximum" type="fermionic"/> <QUANTUMNUMBER name="Sz" min="-N*(2-N)/2" max="N*(2-N)/2"/> <QUANTUMNUMBER name="Nup" min="(N+2*Sz)/2" max="(N+2*Sz)/2"/> <QUANTUMNUMBER name="Ndown" min="(N-2*Sz)/2" max="(N-2*Sz)/2"/> <OPERATOR name="Splus" matrixelement="1"> <CHANGE quantumnumber="Nup" change="1"/> <CHANGE quantumnumber="Ndown" change="-1"/> <CHANGE quantumnumber="Sz" change="1"/> </OPERATOR> <OPERATOR name="Sminus" matrixelement="1"> <CHANGE quantumnumber="Nup" change="-1"/> <CHANGE quantumnumber="Ndown" change="+1"/> <CHANGE quantumnumber="Sz" change="-1"/> </OPERATOR> <OPERATOR name="Sz" matrixelement="Sz"/> <OPERATOR name="c_down" matrixelement="1"> <CHANGE quantumnumber="Ndown" change="-1"/> <CHANGE quantumnumber="N" change="-1"/> <CHANGE quantumnumber="Sz" change="1/2"/> </OPERATOR> <OPERATOR name="cdag_down" matrixelement="1"> <CHANGE quantumnumber="Ndown" change="1"/> <CHANGE quantumnumber="N" change="1"/> <CHANGE quantumnumber="Sz" change="-1/2"/> </OPERATOR> <OPERATOR name="c_up" matrixelement="1"> <CHANGE quantumnumber="Nup" change="-1"/> <CHANGE quantumnumber="N" change="-1"/> <CHANGE quantumnumber="Sz" change="-1/2"/> </OPERATOR> <OPERATOR name="cdag_up" matrixelement="1"> <CHANGE quantumnumber="Nup" change="1"/> <CHANGE quantumnumber="N" change="1"/> <CHANGE quantumnumber="Sz" change="+1/2"/> </OPERATOR> <OPERATOR name="n" matrixelement="N"/> <OPERATOR name="n_up" matrixelement="(N+2*Sz)/2"/> <OPERATOR name="n_down" matrixelement="(N-2*Sz)/2"/> </SITEBASIS> <BASIS name="Kondo lattice"> <SITEBASIS ref="fermion"> <PARAMETER name="local_maximum" value="local_max#"/> <PARAMETER name="local_max#" value="local_max"/> <PARAMETER name="local_max" value="2"/> <PARAMETER name="local_minimum" value="local_min#"/> <PARAMETER name="local_min#" value="local_min"/> <PARAMETER name="local_min" value="0"/> </SITEBASIS> <CONSTRAINT quantumnumber="N" value="N_total"/>  </BASIS> <BONDOPERATOR name="exchange" source="x" target="y"> Sz(x)*Sz(y)+1/2*(Splus(x)*Sminus(y)+Sminus(x)*Splus(y)) </BONDOPERATOR> <BONDOPERATOR name="fermion_hop" source="x" target="y"> cdag_up(x)*c_up(y)+cdag_up(y)*c_up(x)+cdag_down(x)*c_down(y)+cdag_down(y)*c_down(x) </BONDOPERATOR> <HAMILTONIAN name="Kondo lattice"> <PARAMETER name="mu" default="0"/> <PARAMETER name="t" default="1"/> <PARAMETER name="J" default="1"/> <BASIS ref="Kondo lattice"/> <SITETERM type="0" site="i"> -mu*n(i) </SITETERM> <SITETERM type="1"> 0 </SITETERM> <BONDTERM type="0" source="i" target="j"> -t*fermion_hop(i,j) </BONDTERM> <BONDTERM type="1" source="i" target="j"> J*exchange(i,j) </BONDTERM> </HAMILTONIAN> </MODELS> --------------------------CHAIN LATTICE IN my_lattices.xml -------------------------------------- <LATTICES> <LATTICE name="chain lattice" dimension="1"> <PARAMETER name="a" default="1"/> <BASIS><VECTOR>a</VECTOR></BASIS> <RECIPROCALBASIS><VECTOR>2*pi/a</VECTOR></RECIPROCALBASIS> </LATTICE> <UNITCELL name="fermion" dimension="1"> <VERTEX type="0"/> <VERTEX type="1"/> <EDGE type="0"><SOURCE vertex="1" offset="0"/><TARGET vertex="1" offset="1"/></EDGE> <EDGE type="1"><SOURCE vertex="1" offset="0"/><TARGET vertex="2" offset="0"/></EDGE> </UNITCELL> <LATTICEGRAPH name = "chain lattice"> <FINITELATTICE> <LATTICE ref="chain lattice"/> <PARAMETER name="L" default="4"/> <EXTENT size="L"/> <BOUNDARY type="open"/> </FINITELATTICE> <UNITCELL ref="fermion"/> </LATTICEGRAPH> </LATTICES> ---------------------------------------END------------------------------------------------------- Best, Bo-Nan -- Stay foolish,Stay hungry.

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truncation error in DMRG
by Bo-Nan JIANG 16 Mar '13

16 Mar '13

Hi,all In DMRG, what does the sign of truncation error mean? In today's ALPS DMRG, I have got a negative truncation error, wow! So, I think what does a negative truncation error mean? the same as the positive one? Bo-Nan -- Stay foolish,Stay hungry.

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Re: [ALPS-users] Comp-phys-alps-users Digest, Vol 84, Issue 13
by Bo-Nan JIANG 16 Mar '13

16 Mar '13

First, Thanks a lot, Ryo. And second, I am still waiting the answer of DMRG error of Kondo lattice from Matthias, since I have sent you guys parameter file, lattice file and model file. Best, Bo-Nan 2013/3/15 <comp-phys-alps-users-request(a)lists.phys.ethz.ch> > Send Comp-phys-alps-users mailing list submissions to > comp-phys-alps-users(a)lists.phys.ethz.ch > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.phys.ethz.ch/listinfo/comp-phys-alps-users > or, via email, send a message with subject or body 'help' to > comp-phys-alps-users-request(a)lists.phys.ethz.ch > > You can reach the person managing the list at > comp-phys-alps-users-owner(a)lists.phys.ethz.ch > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Comp-phys-alps-users digest..." > > > Today's Topics: > > 1. Kondo lattice DMRG input file (Bo-Nan JIANG) > 2. the right way to define a harmonic trap (Bo-Nan JIANG) > 3. truncation error in DMRG (Bo-Nan JIANG) > 4. Question about simulation output (Prof. Dr. Thomas Pruschke) > 5. Re: the right way to define a harmonic trap (Ryo IGARASHI) > 6. TEBD in ALPS (Bo-Nan JIANG) > 7. Re: TEBD in ALPS (Ryo IGARASHI) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 15 Mar 2013 08:16:25 +0800 > From: Bo-Nan JIANG <bonanjiang(a)gmail.com> > To: "comp-phys-alps-users(a)lists.phys.ethz.ch" > <comp-phys-alps-users(a)lists.phys.ethz.ch> > Subject: [ALPS-users] Kondo lattice DMRG input file > Message-ID: > <CADqUQBPtKTLoVmWX-V7XRvNkgk= > dpYa4TQ-SgB+rJ4__Mb2JZA(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi,Matt > This is the input parameter file with your ALPS Kondo lattice model, the > DMRG parameters are chosen so that the calculation can finish in a short > time, thus be easy to be debugged : > > --------------------------------INPUT PARAMETER FILE (FILE NAME > my_parm)----------------------------------------- > > LATTICE_LIBRARY="my_lattices.xml" > LATTICE="chain lattice" > MODEL="Kondo lattice" > mu=0 > t=1 > J=0.2 > {L=32 > SWEEPS=4 > MAXSTATES=40 > NUMBER_EIGENVALUES=2} > > -----------------------------END OF INPUT PARAMETER > FILE--------------------------------- > > > > -----------------------------my_lattices.xml-------------------------------------------------------------- > > <LATTICES> > > <LATTICE name="chain lattice" dimension="1"> > <PARAMETER name="a" default="1"/> > <BASIS><VECTOR>a</VECTOR></BASIS> > <RECIPROCALBASIS><VECTOR>2*pi/a</VECTOR></RECIPROCALBASIS> > </LATTICE> > <UNITCELL name="fermion" dimension="1"> > <VERTEX type="0"/> > <VERTEX type="1"/> > <EDGE type="0"><SOURCE vertex="1" offset="0"/><TARGET vertex="1" > offset="1"/></EDGE> > <EDGE type="1"><SOURCE vertex="1" offset="0"/><TARGET vertex="2" > offset="0"/></EDGE> > </UNITCELL> > <LATTICEGRAPH name = "chain lattice"> > <FINITELATTICE> > <LATTICE ref="chain lattice"/> > <PARAMETER name="L" default="4"/> > <EXTENT size="L"/> > <BOUNDARY type="open"/> > </FINITELATTICE> > <UNITCELL ref="fermion"/> > </LATTICEGRAPH> > > </LATTICES> > > -------------------------END OF > my_lattices.xml---------------------------------------- > > > -------------------------COMMAND LINE > INPUT----------------------------------------- > > parameter2xml my_parm > > dmrg --write-xml my_parm.in.xml > > ------------------------END OF COMMAND LINE > INPUT------------------------------- > > ERROR: site basis for type 2 not found. Hope you guys can find out what is > going on. > > > > > By the way, if I use wild card and my custom fermion code to reprogram > Model="Kondo lattice" in the fashion of your ALPS Model="spin", the DMRG > and ED both works. But the problem is with mu=0 t=1 and J=1, by DMRG, my > custom Kondo Lattice model shows the gap = 0.21, with 10^-10 truncation > error, while K.Ueda in Phys.Rev.B. 46, 3175 FIG.1 shows a energy gap > smaller than 0.2 under the same parameter condition by ED. (BOTH HALF > FILLING) I recheck my custom Kondo lattice model and find no obvious > mistakes. And I do not know why, can you help me here, too? > > --------------------------INPUT FILE OF CUSTOM KONDO LATTICE > MODEL------------------------------ > > LATTICE_LIBRARY="my_lattices.xml" > LATTICE="chain lattice" > MODEL_LIBRARY="my_models.xml" > MODEL="Kondo lattice" > CONSERVED_QUANTUMNUMBERS="N" > N_total=128 > MEASURE_LOCAL[local density]=n > local_max0=2 > local_min0=0 > local_max1=1 > local_min1=1 > mu=0 > t=1 > J=1 > {L=64 > SWEEPS=10 > MAXSTATES=500 > NUMBER_EIGENVALUES=2} > > > ------------------------CUSTOM KONDO LATTICE > MODEL-------------------------- > > <MODELS> > <SITEBASIS name="fermion"> > <PARAMETER name="local_maximum" default="local_max"/> > <PARAMETER name="local_max" default="2"/> > <PARAMETER name="local_minimun" default="local_min"/> > <PARAMETER name="local_min" default="0"/> > <QUANTUMNUMBER name="N" min="local_minimum" max="local_maximum" > type="fermionic"/> > <QUANTUMNUMBER name="Sz" min="-N*(2-N)/2" max="N*(2-N)/2"/> > <QUANTUMNUMBER name="Nup" min="(N+2*Sz)/2" max="(N+2*Sz)/2"/> > <QUANTUMNUMBER name="Ndown" min="(N-2*Sz)/2" max="(N-2*Sz)/2"/> > <OPERATOR name="Splus" matrixelement="1"> > <CHANGE quantumnumber="Nup" change="1"/> > <CHANGE quantumnumber="Ndown" change="-1"/> > <CHANGE quantumnumber="Sz" change="1"/> > </OPERATOR> > <OPERATOR name="Sminus" matrixelement="1"> > <CHANGE quantumnumber="Nup" change="-1"/> > <CHANGE quantumnumber="Ndown" change="+1"/> > <CHANGE quantumnumber="Sz" change="-1"/> > </OPERATOR> > <OPERATOR name="Sz" matrixelement="Sz"/> > <OPERATOR name="c_down" matrixelement="1"> > <CHANGE quantumnumber="Ndown" change="-1"/> > <CHANGE quantumnumber="N" change="-1"/> > <CHANGE quantumnumber="Sz" change="1/2"/> > </OPERATOR> > <OPERATOR name="cdag_down" matrixelement="1"> > <CHANGE quantumnumber="Ndown" change="1"/> > <CHANGE quantumnumber="N" change="1"/> > <CHANGE quantumnumber="Sz" change="-1/2"/> > </OPERATOR> > <OPERATOR name="c_up" matrixelement="1"> > <CHANGE quantumnumber="Nup" change="-1"/> > <CHANGE quantumnumber="N" change="-1"/> > <CHANGE quantumnumber="Sz" change="-1/2"/> > </OPERATOR> > <OPERATOR name="cdag_up" matrixelement="1"> > <CHANGE quantumnumber="Nup" change="1"/> > <CHANGE quantumnumber="N" change="1"/> > <CHANGE quantumnumber="Sz" change="+1/2"/> > </OPERATOR> > <OPERATOR name="n" matrixelement="N"/> > <OPERATOR name="n_up" matrixelement="(N+2*Sz)/2"/> > <OPERATOR name="n_down" matrixelement="(N-2*Sz)/2"/> > </SITEBASIS> > > <BASIS name="Kondo lattice"> > <SITEBASIS ref="fermion"> > <PARAMETER name="local_maximum" value="local_max#"/> > <PARAMETER name="local_max#" value="local_max"/> > <PARAMETER name="local_max" value="2"/> > <PARAMETER name="local_minimum" value="local_min#"/> > <PARAMETER name="local_min#" value="local_min"/> > <PARAMETER name="local_min" value="0"/> > </SITEBASIS> > <CONSTRAINT quantumnumber="N" value="N_total"/> >  > </BASIS> > > <BONDOPERATOR name="exchange" source="x" target="y"> > Sz(x)*Sz(y)+1/2*(Splus(x)*Sminus(y)+Sminus(x)*Splus(y)) > </BONDOPERATOR> > > <BONDOPERATOR name="fermion_hop" source="x" target="y"> > > > cdag_up(x)*c_up(y)+cdag_up(y)*c_up(x)+cdag_down(x)*c_down(y)+cdag_down(y)*c_down(x) > </BONDOPERATOR> > > <HAMILTONIAN name="Kondo lattice"> > <PARAMETER name="mu" default="0"/> > <PARAMETER name="t" default="1"/> > <PARAMETER name="J" default="1"/> > <BASIS ref="Kondo lattice"/> > <SITETERM type="0" site="i"> > -mu*n(i) > </SITETERM> > <SITETERM type="1"> > 0 > </SITETERM> > <BONDTERM type="0" source="i" target="j"> > -t*fermion_hop(i,j) > </BONDTERM> > <BONDTERM type="1" source="i" target="j"> > J*exchange(i,j) > </BONDTERM> > </HAMILTONIAN> > > </MODELS> > > --------------------------CHAIN LATTICE IN my_lattices.xml > -------------------------------------- > > <LATTICES> > > <LATTICE name="chain lattice" dimension="1"> > <PARAMETER name="a" default="1"/> > <BASIS><VECTOR>a</VECTOR></BASIS> > <RECIPROCALBASIS><VECTOR>2*pi/a</VECTOR></RECIPROCALBASIS> > </LATTICE> > <UNITCELL name="fermion" dimension="1"> > <VERTEX type="0"/> > <VERTEX type="1"/> > <EDGE type="0"><SOURCE vertex="1" offset="0"/><TARGET vertex="1" > offset="1"/></EDGE> > <EDGE type="1"><SOURCE vertex="1" offset="0"/><TARGET vertex="2" > offset="0"/></EDGE> > </UNITCELL> > <LATTICEGRAPH name = "chain lattice"> > <FINITELATTICE> > <LATTICE ref="chain lattice"/> > <PARAMETER name="L" default="4"/> > <EXTENT size="L"/> > <BOUNDARY type="open"/> > </FINITELATTICE> > <UNITCELL ref="fermion"/> > </LATTICEGRAPH> > > </LATTICES> > > > ---------------------------------------END------------------------------------------------------- > > Best, > Bo-Nan > > -- > Stay foolish,Stay hungry. >

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Nearest Neighbor Correlation function
by Billa 15 Mar '13

15 Mar '13

Hi all, I have been trying to set up a classical Monte Carlo simulation with a square lattice Heisenberg model. I am interested in measuring nearest neighbor correlation functions of the type <S^z _i S^z _(i+1)>. How can I define such a measurement? I saw in the ALPS DMRG tutorial that correlation measurements can be set up by inserting the MEASURE_CORRELATIONS command into the parameter file, however this does not seem to work for the Heisenberg model. How can I produce measurements of <S^z _i S^z _(i+1)> type correlators? As a related question, where can I see how the Heisenberg model is defined in ALPS? I found definitions of the Ising, spin and various other models in the models.xml file, but there was no reference to Heisenberg. Finally, in the tutorials on classical Monte Carlo the employed update procedure is referenced as 'cluster'. Which cluster update algorithm is used in alps precisely? I couldn't find this info in the documentation. Thanks in advance for all replies! Billa

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the right way to define a harmonic trap
by Bo-Nan JIANG 15 Mar '13

15 Mar '13

Hi,all I am confused about how to define a harmonic trap in ALPS, shall I add it directly to the SITETERM as follows? <SITETERM type="0" site="i"> <PARAMETER name="x" value="i"/> -mu*n(i)+V*n(i)*(x-L/2)*(x-L/2) </SITETERM> where parameters mu and V, operator n(i) are defined in my_models.xml but, L the length of lattice is defined in a separate independent file my_lattices.xml. Is this kind of definition of harmonic trap OK in ALPS? Bo-Nan -- Stay foolish,Stay hungry.

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TEBD in ALPS
by Bo-Nan JIANG 15 Mar '13

15 Mar '13

Hi, all I install the ALPS 2.1 in Windows XP, and find the TEBD function disable. So, I search the C:\Progam File\ALPS\bin\ , there are dmrg.exe, dmft.exe, but just no tebd.exe, I want to know why and how to fix this problem up. Bo-Nan -- Stay foolish,Stay hungry.

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Re: [ALPS-users] Comp-phys-alps-users Digest, Vol 84, Issue 11
by Bo-Nan JIANG 14 Mar '13

14 Mar '13

Hi, Matthias this is the custom lattice I am using: -------------------------------------my_lattices.xml---------------------------------------------------------------------- <LATTICES> <LATTICE name="chain lattice" dimension="1"> <PARAMETER name="a" default="1"/> <BASIS><VECTOR>a</VECTOR></BASIS> <RECIPROCALBASIS><VECTOR>2*pi/a</VECTOR></RECIPROCALBASIS> </LATTICE> <UNITCELL name="fermion" dimension="1"> <VERTEX type="0"/> <VERTEX type="1"/> <EDGE type="0"><SOURCE vertex="1" offset="0"/><TARGET vertex="1" offset="1"/></EDGE> <EDGE type="1"><SOURCE vertex="1" offset="0"/><TARGET vertex="2" offset="0"/></EDGE> </UNITCELL> <LATTICEGRAPH name = "chain lattice"> <FINITELATTICE> <LATTICE ref="chain lattice"/> <PARAMETER name="L" default="4"/> <EXTENT size="L"/> <BOUNDARY type="periodic"/> </FINITELATTICE> <UNITCELL ref="fermion"/> </LATTICEGRAPH> </LATTICES> ------------------------------------end of my_lattices.xml------------------------------------------------------------------- Bo-Nan 2013/3/13 <comp-phys-alps-users-request(a)lists.phys.ethz.ch> > Send Comp-phys-alps-users mailing list submissions to > comp-phys-alps-users(a)lists.phys.ethz.ch > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.phys.ethz.ch/listinfo/comp-phys-alps-users > or, via email, send a message with subject or body 'help' to > comp-phys-alps-users-request(a)lists.phys.ethz.ch > > You can reach the person managing the list at > comp-phys-alps-users-owner(a)lists.phys.ethz.ch > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Comp-phys-alps-users digest..." > > > Today's Topics: > > 1. "Kondo Lattice" model in ALPS (Bo-Nan JIANG) > 2. question about fermion model (Bo-Nan JIANG) > 3. Re: question about fermion model (Matthias Troyer) > 4. Re: "Kondo Lattice" model in ALPS (Matthias Troyer) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 13 Mar 2013 08:48:42 +0800 > From: Bo-Nan JIANG <bonanjiang(a)gmail.com> > To: "comp-phys-alps-users(a)lists.phys.ethz.ch" > <comp-phys-alps-users(a)lists.phys.ethz.ch> > Subject: [ALPS-users] "Kondo Lattice" model in ALPS > Message-ID: > < > CADqUQBOJNvgOfDGkTY3GUPbu9sAieKzNEJ3xeuDb67v0vDDvZw(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi, ALPS developers and users > > When I did DMRG with the "Kondo lattice" model in ALPS lib, the computer > returned error: > "Site basis for type 2 not found and no default exists." > I do not know whether it is the problem of my code or the ALPS model > itself, so dear developer, is this "Kondo lattice" model in your lib being > tested by DMRG? If it is not, can you test it and tell my whether it works? > (take you five minutes most) Thus, I can make up my mind whether I should > find other way of coding or continue debuging this code which returns > problem. This is really a big help! > > Bo-Nan > > -- > Stay foolish,Stay hungry. >

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