Thermal rectifying effect in macroscopic size

Hu, Bambi; He, Dahai; Yang, Lei; Zhang, Yong

doi:10.1103/physreve.74.060201

Cited by 65 publications

(59 citation statements)

References 23 publications

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“…[54], and it can be explained based on Eqs. (43) and (48): The system can rectify heat when the statistics of the baths and the subsystem differ, with spatial asymmetries included. Furthermore, our analytical expressions of Sec.…”

Section: Simulationsmentioning

confidence: 99%

Two-level system in spin baths: Non-adiabatic dynamics and heat transport

Segal

2014

The Journal of Chemical Physics

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We study the non-adiabatic dynamics of a two-state subsystem in a bath of independent spins using the non-interacting blip approximation, and derive an exact analytic expression for the relevant memory kernel. We show that in the thermodynamic limit, when the subsystem-bath coupling is diluted (uniformly) over many (infinite) degrees of freedom, our expression reduces to known results, corresponding to the harmonic bath with an effective, temperature-dependent, spectral density function. We then proceed and study the heat current characteristics in the out-of-equilibrium spin-spin-bath model, with a two-state subsystem bridging two thermal spin-baths of different temperatures. We compare the behavior of this model to the case of a spin connecting boson baths, and demonstrate pronounced qualitative differences between the two models. Specifically, we focus on the development of the thermal diode effect, and show that the spin-spin-bath model cannot support it at weak (subsystem-bath) coupling, while in the intermediate-strong coupling regime its rectifying performance outplays the spin-boson model.

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Section: Simulationsmentioning

confidence: 99%

Two-level system in spin baths: Non-adiabatic dynamics and heat transport

Segal

2014

The Journal of Chemical Physics

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“…Since the thermal rectifier based on Morse potential has been proposed [4], many thermal rectifiers have been revealved in various structures. For example, the thermal diode by coupling two nonlinear lattices [1,5], the asymmetric nanotubes and graphene [2,[6][7][8], anharmonic graded mass crystals [9,10] and a spin-boson nanojunction model [11]. Inspired by these theoretical studies, Chang and co-workers have produced a microscopic solid-state thermal rectifier based on carbon nanotubes [12].…”

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confidence: 99%

Thermal rectification in thickness-asymmetric graphene nanoribbons

Zhong¹,

Huang²,

Deng³

et al. 2011

Applied Physics Letters

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Thermal rectification in thickness asymmetric graphene nanoribbons connecting single-layer with multi-layer graphene is investigated by using classical nonequilibrium molecular dynamics. It is reported that the graphene nanoribbons with thickness-asymmetry have a good thermal rectification. The thermal rectification factor depends on temperature as well as the thickness-ratio of the two-segment. Our results provide a direct evidence that the thermal rectifier can be achieved in a nanostructure crossing two-and three-dimension.

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“…Assuming the materials they use maintain a constant thermal conductivity thermal rectification will not occur. In 2006 Hu et al proposed a design for a macroscale thermal rectifier based on the same mechanism that has been discussed in this section [36]. They use non-equilibrium molecular dynamics (NEMD) simulations to demonstrate the rectifying behavior of a system of quartz and diamond.…”

Section: Temperature Dependence Of Thermal Conductivity At Interfacesmentioning

confidence: 99%

A review of thermal rectification observations and models in solid materials

Roberts

Walker

2011

International Journal of Thermal Sciences

325

283

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Thermal rectification is a phenomenon in which thermal transport along a specific axis is dependent upon the sign of the temperature gradient or heat current. This phenomenon offers improved thermal management of electronics as size scales continue to decrease and new technologies emerge by having directions of preferred thermal transport. For most applications where thermally rectifying materials could be of use they would need to exhibit one direction with high thermal conductivity to allow for efficient transport of heat from heat generating components to a sink and one direction with low conductivity to insulate the temperature and heat flux sensitive components. In the process of understanding and developing these materials multiple mechanisms have been found which produce thermally rectifying behavior and much work has been and is being done to improve our understanding of the mechanisms and how these mechanisms can be used with our improved ability to fabricate at the nanoscale to produce efficient materials which have high levels of thermal rectification.

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Thermal rectifying effect in macroscopic size

Cited by 65 publications

References 23 publications

Two-level system in spin baths: Non-adiabatic dynamics and heat transport

Two-level system in spin baths: Non-adiabatic dynamics and heat transport

Thermal rectification in thickness-asymmetric graphene nanoribbons

A review of thermal rectification observations and models in solid materials

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