1. Correlation functions from tensor network influence functionals: The case of the spin-boson model.
- Author
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Nguyen, Haimi, Ng, Nathan, Lindoy, Lachlan P., Park, Gunhee, Millis, Andrew J., Kin-Lic Chan, Garnet, and Reichman, David R.
- Subjects
STATISTICAL correlation ,MATRIX multiplications ,FUNCTIONALS ,EQUILIBRIUM - Abstract
We investigate the application of matrix product state (MPS) representations of the influence functionals (IFs) for the calculation of real-time equilibrium correlation functions in open quantum systems. Focusing specifically on the unbiased spin-boson model, we explore the use of IF-MPSs for complex time propagation, as well as IF-MPSs for constructing correlation functions in the steady state. We examine three different IF approaches: one based on the Kadanoff–Baym contour targeting correlation functions at all times, one based on a complex contour targeting the correlation function at a single time, and a steady state formulation, which avoids imaginary or complex times, while providing access to correlation functions at all times. We show that within the IF language, the steady state formulation provides a powerful approach to evaluate equilibrium correlation functions. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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