Thermal balance and quantum heat transport in nanostructures thermalized by local Langevin heat baths

TL;DR

This paper investigates quantum heat transport in nanostructures using a self-consistent thermal bath model with Langevin heat baths, bridging ballistic and diffusive regimes and deriving a comprehensive thermal current formula.

Contribution

It introduces a unified approach to model quantum heat transfer in nanostructures with self-consistent baths, enabling transparent thermalization and phonon transport analysis.

Findings

Transition from ballistic to diffusive phonon transport with increasing bath coupling

Derivation of a thermal current formula combining Caroli and Landauer-Büttiker limits

Effective modeling of thermalization and acoustic matching in nanostructures

Abstract

Modeling of thermal transport in practical nanostructures requires making trade-offs between the size of the system and the completeness of the model. We study quantum heat transfer in a self-consistent thermal bath setup consisting of two lead regions connected by a center region. Atoms both in the leads and in the center region are coupled to quantum Langevin heat baths that mimic the damping and dephasing of phonon waves by anharmonic scattering. This approach treats the leads and the center region on same footing and thereby allows for a simple and physically transparent thermalization of the system, enabling also perfect acoustic matching between the leads and the center region. Increasing the strength of the coupling reduces the mean free path of phonons and gradually shifts phonon transport from ballistic regime to diffusive regime. In the center region, the bath temperatures are determined self-consistently from the requirement of zero net energy exchange between the local heat bath and each atom. By solving the stochastic equations of motion in frequency space and averaging over noise using the general fluctuation-dissipation relation derived by Dhar and Roy [J. Stat. Phys. 125, 801 (2006)], we derive the formula for thermal current, which contains the Caroli formula for phonon transmission function and reduces to the Landauer-B\"uttiker formula in the limit of vanishing coupling to local heat baths.