scholarly journals Defect-Engineered Heat Transport in Graphene: A Route to High Efficient Thermal Rectification

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Weiwei Zhao ◽  
Yanlei Wang ◽  
Zhangting Wu ◽  
Wenhui Wang ◽  
Kedong Bi ◽  
...  
Keyword(s):  
Heat Transport ◽  
Thermal Rectification ◽  
High Efficient

Heat controlling in the mass-graded harmonic lattices with double-well on-site potential

2018 ◽  
Vol 32 (20) ◽  
pp. 1850217
Author(s):  
Peng Kong ◽  
Zhengzheng Wei ◽  
Tao Hu ◽  
Yi Tang
Keyword(s):  
Molecular Dynamics ◽  
Heat Flux ◽  
Power Spectrum ◽  
Molecular Dynamics Simulations ◽  
Heat Transport ◽  
Nonequilibrium Molecular Dynamics ◽  
Thermal Rectification ◽  
Average Temperature ◽  
New Type ◽  
Dynamics Simulations

Using nonequilibrium molecular dynamics simulations, we investigate thermal rectification in mass-graded lattices with a new type on-site potential which has a physical picture of the double-well. By adjusting the ratio of harmonic on-site potential and anharmonic on-site potential, we could obtain the optimal heat transport and the best thermal rectification. In addition, we observe the reversal thermal rectification by changing the ratio of on-site potential and analyzes the mechanism of thermal rectification through the power spectrum. At last, we also study the heat flux and thermal rectification in a different case of average temperature and mass gradient.

Thermal Rectification Characteristics of Graphene Nanoribbons of Asymmetric Geometries

MRS Advances ◽  
2016 ◽  
Vol 2 (1) ◽  
pp. 15-20
Author(s):  
T. Iwata ◽  
K. Shintani
Keyword(s):  
Molecular Dynamics ◽  
Heat Transport ◽  
Density Of States ◽  
Graphene Nanoribbons ◽  
Longitudinal Direction ◽  
Nonequilibrium Molecular Dynamics ◽  
Phonon Density ◽  
Rectification Ratio ◽  
Phonon Density Of States ◽  
Thermal Rectification

ABSTRACTThe rectification of heat in graphene nanoribbons (GNRs) of asymmetric geometries is investigated by means of nonequilibrium molecular dynamics (NEMD). Two kinds of geometries of GNRs are addressed; a trapezoidal or T-shaped step is inserted halfway through a GNR in its longitudinal direction. The thermal conductivities (TCs) of the GNRs in the two longitudinal directions, forward and backward, are calculated making their width and temperature change. It is revealed that the thermal rectification ratio (TRR) of T-shaped GNRs are larger than those of trapezoidal GNRs and that the characteristics of heat transport in such asymmetric GNRs can be understood by considering the local phonon density of states (DOSs).

Heat Transport Through a Solid-Liquid Interface System and its Thermal Rectification Phenomena by Molecular Dynamics Simulations

2014 ◽  
Author(s):  
Feng Yuan ◽  
Liang Xin-Gang
Keyword(s):  
Heat Transfer ◽  
Molecular Dynamics ◽  
Heat Transport ◽  
Liquid System ◽  
Atomic Mass ◽  
Liquid Interfaces ◽  
Thermal Rectification ◽  
The Asymmetry ◽  
Solid Liquid ◽  
Solid Walls

Solid-liquid interfaces widely exist in microdevices, it is necessary to study the heat transfer mechanism through solid-liquid interfaces. We compose a sandwich structure of solid-liquid system. The liquid is argon and the solid has FCC structure with different atomic mass. Heat transfer and rectification are investigated by molecular dynamics method. The effect of wettability of liquid argon is found to be essential to heat transport at solid-liquid interfaces. Asymmetric mass distribution affects the heat flux through the system. Thermal rectification is produced when the atomic mass of virtual solid walls differs. The asymmetry of interfacial thermal resistances between liquid and solid is observed, as well as the thermal rectification when the depth of potential well of virtual solid walls change. The larger the asymmetry is, the more obvious the thermal rectification is.

Controlling heat transport in the spin-chain system with multi-spin interaction and external field

2017 ◽  
Vol 31 (22) ◽  
pp. 1750209
Author(s):  
Xiu-Xing Zhang ◽  
Guo-Wen Zhang
Keyword(s):  
External Field ◽  
Heat Transport ◽  
Temperature Difference ◽  
Spin Chain ◽  
Spin Interaction ◽  
Physical Origin ◽  
Thermal Rectification ◽  
System Parameters ◽  
Chain System ◽  
Mean Temperature

The heat currents and thermal rectification in a non-equilibrium spin-chain system with multi-spin interaction and external field are investigated. The influence of system parameters, including mean temperature, temperature difference, external field and multi-spin interaction, on heat currents and thermal rectification are studied. We show that the magnitude of heat currents and thermal rectification can be controlled by varying these parameters. Particularly, by increasing the intensity of multi-spin interaction and external field, two kinds of blockade phenomena can be observed, i.e. the thermal blockade and the energy blockade. Besides, the physical origin of thermal rectification and the blockade phenomena are explored. In addition, the present results may provide a useful approach to the controlling of heat currents when there exists multi-spin interaction in the system.

scholarly journals The qutrit as a heat diode and circulator

2021 ◽  
Author(s):  
Israel Díaz ◽  
Rafael Sanchez
Keyword(s):  
Heat Transport ◽  
Level System ◽  
Quality Factors ◽  
Thermal Rectification ◽  
Heat Flows ◽  
Superconducting Circuit ◽  
Heat Leakage ◽  
Heat Transport Properties ◽  
Ideal Diode ◽  
Resonant Transitions

Abstract We investigate the heat transport properties of a three-level system coupled to three thermal baths, assuming a model based on superconducting circuit implementations. The system-bath coupling is mediated by resonators which serve as frequency filters for the different qutrit transitions. Taking into account the finite quality factors of the resonators, we find thermal rectification and circulation effects not expected in configurations with perfectly-filtered couplings. Heat leakage in off-resonant transitions can be exploited to make the system work as an ideal diode where heat flows in the same direction between two baths irrespective of the sign of the temperature difference, as well as a perfect heat circulator whose state is phase-reversible.

scholarly journals Effect of Inter-System Coupling on Heat Transport in a Microscopic Collision Model

Entropy ◽  
2021 ◽  
Vol 23 (4) ◽  
pp. 471
Author(s):  
Feng Tian ◽  
Jian Zou ◽  
Lei Li ◽  
Hai Li ◽  
Bin Shao
Keyword(s):  
Heat Transport ◽  
Thermal Environment ◽  
Interaction Strength ◽  
Quantum Correlations ◽  
Environment Interaction ◽  
Rectification Effect ◽  
Thermal Rectification ◽  
Collision Model ◽  
System Environment ◽  
System Coupling

In this paper we consider a bipartite system composed of two subsystems each coupled to its own thermal environment. Based on a collision model, we mainly study whether the approximation (i.e., the inter-system coupling is ignored when modeling the system–environment interaction) is valid or not. We also address the problem of heat transport unitedly for both excitation-conserving system–environment interactions and non-excitation-conserving system–environment interactions. For the former interaction, as the inter-system interaction strength increases, at first this approximation gets worse as expected, but then counter-intuitively gets better even for a stronger inter-system coupling. For the latter interaction with asymmetry, this approximation gets progressively worse. In this case we realize a perfect thermal rectification, and we cannot find an apparent rectification effect for the former interaction. Finally and more importantly, our results show that whether this approximation is valid or not is closely related to the quantum correlations between the subsystems, i.e., the weaker the quantum correlations, the more justified the approximation and vice versa.

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