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Theory of Two-Dimensional Nonlinear Spectroscopy for the Kitaev Spin Liquid
Wonjune Choi1, Ki Hoon Lee2,3, Yong Baek Kim1
1Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.
Abstract:
Unambiguous identification of fractionalized excitations in quantum spin liquids has been a long-standing issue in correlated topological phases. Conventional spectroscopic probes, such as the dynamical spin structure factor, can only detect composites of fractionalized excitations, leading to a broad continuum in energy. Lacking a clear signature in conventional probes has been the biggest obstacle in the field. In this work, we theoretically investigate what kinds of distinctive signatures of fractionalized excitations can be probed in two-dimensional nonlinear spectroscopy by considering the exactly solvable Kitaev spin liquids. We demonstrate the existence of a number of salient features of the Majorana fermions and fluxes in two-dimensional nonlinear spectroscopy, which provide crucial information about such excitations.
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