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(a)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(a)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(a)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
>>>
>>>
>>
>>
>
>