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arXiv · 2004.05017

Steady state quantum transport through an anharmonic oscillator strongly coupled to two heat reservoirs

Tianqi Chen·Vinitha Balachandran·Chu Guo·Dario Poletti
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Abstract

We investigate the transport properties of an anharmonic oscillator, modeled by a single-site Bose-Hubbard model, coupled to two different thermal baths using the numerically exact thermofield based chain-mapping matrix product states (TCMPS) approach. We compare the effectiveness of TCMPS to probe the nonequilibrium dynamics of strongly interacting system irrespective of the system-bath coupling against the global master equation approach in Gorini-Kossakowski-Sudarshan-Lindblad form. We discuss the effect of on-site interactions, temperature bias as well as the system-bath couplings on the steady state transport properties. Last we also show evidence of non-Markovian dynamics by studying the non-monotonicity of the time evolution of the trace distance between two different initial states.

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Tianqi Chen, Vinitha Balachandran, Chu Guo, Dario Poletti. 2020-04-10. Steady state quantum transport through an anharmonic oscillator strongly coupled to two heat reservoirs. https://doi.org/10.1103/physreve.102.012155

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