Sy-reflection is a symmetry, and thus there is always the y-reflected state as well which has the same energy.
For the Sy-Sy correlations you can just measure S+ - S+, S+ - S- and S- - S- correlations and calculate it from the, without the need for complex arithmetic
Matthias
On Jan 14, 2009, at 12:56 PM, zhian asadzadeh wrote:
Dear I don't think so, when we increase the field this is true. and for tow point correlations <Sy Sy>, I need to define Sy. Thanks Zhian
On Thu, Jan 15, 2009 at 12:20 AM, Matthias Troyer troyer@phys.ethz.ch wrote: Then <Sy> should be 0 by symmetry
On Jan 14, 2009, at 12:48 PM, zhian asadzadeh wrote:
Hi I have an isotropy in Z direction, and the field is in X direction Thanks Zhian
On Thu, Jan 15, 2009 at 12:15 AM, Matthias Troyer <troyer@phys.ethz.ch
wrote:
Is the transverse field in the x or y direction?
On Jan 14, 2009, at 12:43 PM, zhian asadzadeh wrote:
Hi
My model doesn't conserve U(1) symmetry. My model is spin chain in transverse magnetic field. if we want to define the Sy we must use complex number i, so can we define complex number in Model.XML file?
Thanks, Zhian
On Wed, Jan 14, 2009 at 9:54 PM, Matthias Troyer <troyer@phys.ethz.ch
wrote:
Does your model conserve SU(2) or U(1) symmetry? In that case the expectation value is 0. Otherwise you should be able to measure it
Matthias
On 30 Dec 2008, at 04:33, zhian asadzadeh wrote:
Hi Dears
Can i measure the expectation value of the y component of Spin operator (Sy)?( in DMRG )
Thanks
Zhian