November 2012 - Comp-phys-alps-users

how to retrieve output datas in DMRG
by Emanuele Levi 19 Nov '12

19 Nov '12

Dear ALPS users, I am running the DMRG algorithm with python. I don't understand where the energy/entropy/trunc. err. history is recorded. I would like to set up a way to create three different files with the history of these three quantities. Is there a way to do that? Many thanks. Kindest regards. -- Emanuele Levi emanuele.levi(a)gmail.com

2 1

Re: [ALPS-users] Dzyaloshinskii-Moriya Interaction and spinmc
by Synge Todo 18 Nov '12

18 Nov '12

Dear ALPS Developers and Users, Cc: Mojtaba Alaei If I remember correctly, there was a similar request several years ago. Does anyone have experience in implementing DM interaction in spinmc code? Best, Synge On 2012/11/16, at 1:55, mojtaba alaei <mojtaba.alaei(a)gmail.com> wrote: > Dear Dr. Synge Todo > > I want to implement Dzyaloshinskii-Moriya (DM) interaction in spinmc code. > Unfortunately I am not familiar with C++ and now I am reading C++ ( Normally I use Fortran). > But when I look at the code, it makes me dizzy, there is almost no comments and following the code > for me is really difficult. > > Could you please help me to do this? > If you only tell me where I should add the term of DM interaction, it will really help me. > > > Thanks in advanced > > Mojtaba Alaei

2 1

Calculation of Entropy
by Forwordom 15 Nov '12

15 Nov '12

Hi, ALPS users and developers I have two questions about calculation of entropy by using DMRG: (1)If I can calculate the entropy of system by DMRG and how to get final entropy data besides standard output in the screen? (2)What dependence of entropy on system's properties ? In other words if it is depend on gapped or gapless ,chain or quasi-1D system. I would be very grateful for your responce.

3 5

Brains Chen wants to share new pictures with you
by Brains Chen 06 Nov '12

06 Nov '12

1 0

Brains Chen wants to share new pictures with you
by Brains Chen 06 Nov '12

06 Nov '12

1 0

Alps-user
by konefvitbka53＠gmail.com 02 Nov '12

02 Nov '12

Hi all, whether it is possible to calculate in algorithms of worm and sse model with two-particle transfer, and calculate stiffness.

1 0

Maybe "honeycomb" definition is wrong in lattice lib (lattices.xml)
by kaveh edalat 01 Nov '12

01 Nov '12

Dear All I like to make a graphene bilayer. I wanted to use "honeycomb" definition in the lattice library but I found something strange! The strange thing is the definition of vertexes: <UNITCELL name="honeycomb" dimension="2"> <VERTEX><COORDINATE>0 0</COORDINATE></VERTEX> <VERTEX><COORDINATE>-0.288665771484375 0.5773468017578125</COORDINATE></VERTEX> ....... ...... </UNITCELL> I don't know how these two numbers "-0.288665771484375 0.5773468017578125" were generated ( they are near to "-1/(2*sqrt(3)), 1/sqrt(3)" !) I think if we suppose the vertex coordinate is defined according to the lattice vectors (.i.e. a1=[1 0], a2=[1/2 sqrt(3)/2]), then the correct numbers should be: "-1/3, 2/3" (-1/3*a1+2/3*a2). So the correct "UNITCELL" should be: <UNITCELL name="honeycomb" dimension="2"> <VERTEX><COORDINATE>0 0</COORDINATE></VERTEX> <VERTEX><COORDINATE>-1/3 2/3</COORDINATE></VERTEX> ....... ...... </UNITCELL> I checked the new "UNITCELL", and I found the lattice is more like to graphene. If I am wrong please correct me. Thanks Kaveh Edalat

1 0