Dear All

Please make a note of Friday’s research seminar in your diaries. PLEASE NOTE THAT THE TIME AND VENUE ARE DIFFERENT FROM NORMAL – SEE BELOW!

Date: Friday 8th June

Who: Anders Sandvik, Boston University

Seminar type: Research Seminar

Time: 2pm

Where: Physics Annexe, CONFFERENCE ROOM, Room 407

Abstract:

Traditionally, quantum Monte Carlo simulations of spin hamiltonians have been carried out in the basis of the Sz eigenstates. Here Anders will discuss an alternative technique in which the ground state is projected out from a trial state in the valence bond basis. Thanks to the particular properties of the valence basis, this approach enables calculations of some quantities that are difficult to access with standard methods. In particular, triplet excitations at finite momentum can be studied. Their dispersion relation as well as matrix elements corresponding to the single-magnon peak in the dynamic structure factor can be calculated. Anders will present some results for 1D and 2D Heisenberg antiferromagnets.