Spectroscopy and complex-time correlations using minimally entangled typical thermal states
arxiv(2024)
摘要
Tensor network states have enjoyed great success at capturing aspects of
strong correlation physics. However, obtaining dynamical correlators at
non-zero temperatures is generically hard even using these methods. Here, we
introduce a practical approach to computing such correlators using minimally
entangled typical thermal states (METTS). While our primary method directly
computes dynamical correlators of physical operators in real time, we propose
extensions where correlations are evaluated in the complex-time plane. The
imaginary time component bounds the rate of entanglement growth and strongly
alleviates the computational difficulty allowing the study of larger system
sizes. To extract the physical correlator one must take the limit of purely
real-time evolution. We present two routes to obtaining this information (i)
via an analytic correlation function in complex time combined with a stochastic
analytic continuation method to obtain the real-time limit and (ii) a hermitian
correlation function that asymptotically captures the desired correlation
function quantitatively without requiring effort of numerical analytic
continuation. We show that these numerical techniques capture the
finite-temperature dynamics of the Shastry-Sutherland model - a model of
interacting spin one-half in two dimensions.
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