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Title: Wave function methods for canonical ensemble thermal averages in correlated many-fermion systems

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/5.0022702· OSTI ID:1774553

We present a wave function representation for the canonical ensemble thermal density matrix by projecting the thermofield double state against the desired number of particles. Furthermore, the resulting canonical thermal state obeys an imaginary-time evolution equation. Starting with the mean-field approximation, where the canonical thermal state becomes an antisymmetrized geminal power (AGP) wave function, we explore two different schemes to add correlation: by number-projecting a correlated grand-canonical thermal state and by adding correlation to the number-projected mean-field state. As benchmark examples, we use number-projected configuration interaction and an AGP-based perturbation theory to study the hydrogen molecule in a minimal basis and the six-site Hubbard model.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Welch Foundation
Grant/Contract Number:
FG02-09ER16053; SC0001474
OSTI ID:
1774553
Alternate ID(s):
OSTI ID: 1668438
Journal Information:
Journal of Chemical Physics, Vol. 153, Issue 12; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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