On Mon, Mar 2, 2009 at 2:30 PM,
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Today's Topics:
1. Operator difinition (zhian asadzadeh)
2. Re: Operator difinition (Adrian E. Feiguin)
----------------------------------------------------------------------
Message: 1
Date: Sun, 1 Mar 2009 15:37:58 +0330
From: zhian asadzadeh <zhian.asadzadeh@gmail.com>
Subject: [ALPS-users] Operator difinition
To: comp-phys-alps-users@phys.ethz.ch
Message-ID:
<89e5d6760903010407m44b1729raa91afa47e962e18@mail.gmail.com>
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Hi Dear,
Thank you very much for your consideration. yes my model mixes states with
different Sz.
let me know DMRG works with complex vectors or not? and Can I change the
basis which DMRG works in it?
Thanks a lot
Mohammad.
On Sun, Mar 1, 2009 at 2:30 PM,
<comp-phys-alps-users-request@phys.ethz.ch>wrote:
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> Today's Topics:
>
> 1. Operator definition (zhian asadzadeh)
> 2. Re: Operator definition (Adrian E. Feiguin)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 28 Feb 2009 15:11:34 +0330
> From: zhian asadzadeh <zhian.asadzadeh@gmail.com>
> Subject: [ALPS-users] Operator definition
> To: comp-phys-alps-users@phys.ethz.ch
> Message-ID:
> <89e5d6760902280341r7ca16b5fm506e562c4f043c64@mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi All,
>
> I am using DMRG for my problem, I need to calculate expectation value of Y
> component of Spin operator (Sy) , As a result, I need to define it in the
> model.xml file. How I can define it? I tried with
> Sy(i)=1/(2*sqrt(-1))*(Splus(i)-Sminus(i)), but I got incorrect results. I
> will be very appreciate if someone could help me?
>
> Thank you very much,
> Mohammad.
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> ------------------------------
>
> Message: 2
> Date: Sat, 28 Feb 2009 11:32:00 -0800
> From: "Adrian E. Feiguin" <afeiguin@kitp.ucsb.edu>
> Subject: Re: [ALPS-users] Operator definition
> To: comp-phys-alps-users@phys.ethz.ch
> Message-ID: <49A99130.2040704@kitp.ucsb.edu>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi Mohammad,
>
> You are missing the imaginary unit in the definition. In any case, DMRG
> at the moment does not work with complex numbers.
> You would have to measure Splus and Sminus, and then combine the results.
> But all this only makes sense assuming that your Hamiltonian already
> mixes states with different Sz. What model are you studying?
>
> Saludos,
> <ADRIAN>
>
> zhian asadzadeh wrote:
> > Hi All,
> >
> > I am using DMRG for my problem, I need to calculate expectation value
> > of Y component of Spin operator (Sy) , As a result, I need to define
> > it in the model.xml file. How I can define it? I tried with
> > Sy(i)=1/(2*sqrt(-1))*(Splus(i)-Sminus(i)), but I got incorrect
> > results. I will be very appreciate if someone could help me?
> >
> > Thank you very much,
> > Mohammad.
> >
>
>
>
> End of Comp-phys-alps-users Digest, Vol 36, Issue 1
> ***************************************************
>
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------------------------------
Message: 2
Date: Sun, 01 Mar 2009 10:03:49 -0800
From: "Adrian E. Feiguin" <afeiguin@kitp.ucsb.edu>
Subject: Re: [ALPS-users] Operator difinition
To: comp-phys-alps-users@phys.ethz.ch
Message-ID: <49AACE05.1000104@kitp.ucsb.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I'm affraid you can't work with complex numbers, yet. Probably next
version will, we are working on it.
zhian asadzadeh wrote:
> Hi Dear,
>
> Thank you very much for your consideration. yes my model mixes states
> with different Sz.
> let me know DMRG works with complex vectors or not? and Can I change
> the basis which DMRG works in it?
>
> Thanks a lot
> Mohammad.
>
> On Sun, Mar 1, 2009 at 2:30 PM,
> <comp-phys-alps-users-request@phys.ethz.ch
> <mailto:comp-phys-alps-users-request@phys.ethz.ch>> wrote:
>
> Send Comp-phys-alps-users mailing list submissions to
> comp-phys-alps-users@phys.ethz.ch
> <mailto:comp-phys-alps-users@phys.ethz.ch>
>
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>
> https://webmail.phys.ethz.ch/mailman/listinfo/comp-phys-alps-users
> or, via email, send a message with subject or body 'help' to
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> <mailto:comp-phys-alps-users-request@phys.ethz.ch>
>
> You can reach the person managing the list at
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>
> 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. Operator definition (zhian asadzadeh)
> 2. Re: Operator definition (Adrian E. Feiguin)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 28 Feb 2009 15:11:34 +0330
> From: zhian asadzadeh <zhian.asadzadeh@gmail.com
> <mailto:zhian.asadzadeh@gmail.com>>
> Subject: [ALPS-users] Operator definition
> To: comp-phys-alps-users@phys.ethz.ch
> <mailto:comp-phys-alps-users@phys.ethz.ch>
> Message-ID:
>
> <89e5d6760902280341r7ca16b5fm506e562c4f043c64@mail.gmail.com
> <mailto:89e5d6760902280341r7ca16b5fm506e562c4f043c64@mail.gmail.com>>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi All,
>
> I am using DMRG for my problem, I need to calculate expectation
> value of Y
> component of Spin operator (Sy) , As a result, I need to define it
> in the
> model.xml file. How I can define it? I tried with
> Sy(i)=1/(2*sqrt(-1))*(Splus(i)-Sminus(i)), but I got incorrect
> results. I
> will be very appreciate if someone could help me?
>
> Thank you very much,
> Mohammad.
> -------------- next part --------------
> An HTML attachment was scrubbed...
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> https://webmail.phys.ethz.ch/pipermail/comp-phys-alps-users/attachments/20090228/dbb5fcf5/attachment.html
>
> ------------------------------
>
> Message: 2
> Date: Sat, 28 Feb 2009 11:32:00 -0800
> From: "Adrian E. Feiguin" <afeiguin@kitp.ucsb.edu
> <mailto:afeiguin@kitp.ucsb.edu>>
> Subject: Re: [ALPS-users] Operator definition
> To: comp-phys-alps-users@phys.ethz.ch
> <mailto:comp-phys-alps-users@phys.ethz.ch>
> Message-ID: <49A99130.2040704@kitp.ucsb.edu
> <mailto:49A99130.2040704@kitp.ucsb.edu>>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi Mohammad,
>
> You are missing the imaginary unit in the definition. In any case,
> DMRG
> at the moment does not work with complex numbers.
> You would have to measure Splus and Sminus, and then combine the
> results.
> But all this only makes sense assuming that your Hamiltonian already
> mixes states with different Sz. What model are you studying?
>
> Saludos,
> <ADRIAN>
>
> zhian asadzadeh wrote:
> > Hi All,
> >
> > I am using DMRG for my problem, I need to calculate expectation
> value
> > of Y component of Spin operator (Sy) , As a result, I need to define
> > it in the model.xml file. How I can define it? I tried with
> > Sy(i)=1/(2*sqrt(-1))*(Splus(i)-Sminus(i)), but I got incorrect
> > results. I will be very appreciate if someone could help me?
> >
> > Thank you very much,
> > Mohammad.
> >
>
>
>
> End of Comp-phys-alps-users Digest, Vol 36, Issue 1
> ***************************************************
>
>
End of Comp-phys-alps-users Digest, Vol 36, Issue 2
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