[ALPS-users] DMRG measurements of observables with support only on some lattice sites

[Axel Gagge]

Hello all,


I am working with DMRG for a model where the unit cell consists of two lattice sites of different types (one is a boson mode while the other is a two-level/spin 1/2). Now, I want to measure say the expectation value <Sz> of my ground state on all the spin sites - how can I do this in ALPS? If I use MEASURE_LOCAL, ALPS tries to compute the expectation value of Sz for the boson sites and crashes.


MEASURE_LOCAL_AT seems like the reasonable thing to work with, but does it also work for expectation values?


Best regards,

Axel

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.phys.ethz.ch/pipermail/comp-phys-alps-users/attachments/20170509/57793810/attachment.html>