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Title: Spectral gaps of two- and three-dimensional many-body quantum systems in the thermodynamic limit
We present an expression for the spectral gap, opening up new possibilities for performing and accelerating spectral calculations of quantum many-body systems. We develop and demonstrate one such possibility in the context of tensor network simulations. Our approach requires only minor modifications of the widely used simple update method and is computationally lightweight relative to other approaches. We validate it by computing spectral gaps of the 2D and 3D transverse-field Ising models and find strong agreement with previously reported perturbation theory results. Published by the American Physical Society2024  more » « less
Award ID(s):
2403609
PAR ID:
10575044
Author(s) / Creator(s):
; ; ; ;
Publisher / Repository:
American Physical Society
Date Published:
Journal Name:
Physical Review Research
Volume:
6
Issue:
2
ISSN:
2643-1564
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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