Level Spectroscopy in Quantum Antiferromagnets Using Monte Carlo Simulations
The low-energy spectrum of antiferromagnets reveal valuable information
about the nature of the phase or phase transition in such systems. I review
the recent works done in collaboration with Suwa and Sandvik
[Phys. Rev. B 92, 195145 (2015), Phys. Rev. B 94, 144416 (2016)]
on how to probe the dispersion of the excitations in a
variety of SU(2) symmetric S=1/2 spin systems using
quantum Monte-Carlo methods.
Various applications are discussed in both one and two
dimensions, which include probing the critical excitations for
conventional and unconventional quantum critical points. In
the latter case, the excitation spectrum is highly unusual and has
additional gapless modes and possible emergent symmetries
which are not present otherwise.
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Copyright (c) 2018 Arnab Sen
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