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Title: Efficient numerical method for evaluating normal and anomalous time-domain equilibrium Green's functions in inhomogeneous systems

Journal Article · · Physical Review. B

In this work we develop EPOCH (equilibrium propagator by orthogonal polynomial chain), a computationally efficient method to calculate the time-dependent equilibrium Green's functions, including the anomalous Green's functions of superconductors, to capture the time evolution in large inhomogeneous systems. The EPOCH method generalizes the Chebyshev wave-packet propagation method from quantum chemistry and efficiently incorporates the Fermi-Dirac statistics that is needed for equilibrium quantum condensed matter systems. The computational cost of EPOCH scales only linearly in the system degrees of freedom, generating an extremely efficient algorithm also for very large systems. We demonstrate the power of the EPOCH method by calculating the time evolution of an excitation near a superconductor–normal metal interface in two and three dimensions, capturing transmission as well as normal and Andreev reflections.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Swedish Research Council (SRC); European Union (EU); Knut and Alice Wallenberg Foundation
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1825439
Report Number(s):
LA-UR--20-23078
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Finite bulk Josephson currents and chirality blockade removal from inter-orbital pairing in magnetic Weyl semimetals text January 2019
Effects of momentum-dependent quasiparticle renormalization on the gap structure of iron-based superconductors text January 2019
Bulk odd-frequency pairing in the superconducting Su-Schrieffer-Heeger model text January 2020
Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions text January 2020