Nonlinearity enhanced interfacial thermal conductance and rectification

Thingna, Juzar; He, Dahai; Wang, Jian‐Sheng; Li, Baowen

doi:10.1209/0295-5075/103/64002

Cited by 33 publications

(36 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A variant of the QSCPT; namely, the quantum selfconsistent mean field (QSCMF) approach [32], matches well with the QSCPT in the weak interfacial coupling limit considered in this work. The main difference between the QSCPT and QSCMF is that in the former we assume canonical averaging whereas in the latter a nonequilibrium average is taken.…”

Section: Model and Theorysupporting

confidence: 66%

See 1 more Smart Citation

Interfacial thermal transport with strong system-bath coupling: A phonon delocalization effect

Thingna

Cao

2018

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We study the effect of system-bath coupling strength on quantum thermal transport through the interface of two weakly coupled anharmonic molecular chains by using a quantum self-consistent phonon approach. The approach inherently assumes that the two segments (anharmonic molecular chains) are approximately in local thermal equilibrium with respect to the baths that they are connected to and transforms the strongly anharmonic system into an effective harmonic one with a temperature-dependent transmission. Despite the approximations, the approach is ideal for our setup, wherein the weak interfacial coupling guarantees an approximate local thermal equilibrium of each segment and short chain length (less than the phonon mean-free path) ensues from the effective harmonic approximation. Remarkably, the heat current shows a resonant to bi-resonant transition due to the variations in the interfacial coupling and temperature, which is attributed to the delocalization of phonon modes. Delocalization occurs only in the strong system-bath coupling regime and we utilize it to model a thermal rectifier whose ratio can be nonmonotonically tuned not only with the intrinsic system parameters but also with the external temperature.

show abstract

Section: Model and Theorysupporting

confidence: 66%

“…Furthermore, we ensure that each segment comprises only of a few atoms such that the mean-free path of the phonons, which is typically hundreds of atoms [30,31], is much longer than the segment length. Hence, QSCPT could be applied independently to the two segments without the need to deal with nonequilibrium averages [32].…”

Section: Model and Theorymentioning

confidence: 99%

Interfacial thermal transport with strong system-bath coupling: A phonon delocalization effect

Thingna

Cao

2018

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…In this work, is not included in (6). The conventional approach to solve phonon boundary scattering is composed of an indirect method and a direct method.…”

Section: Monte Carlo Methods Of Phonon Transportmentioning

confidence: 99%

“…In recent years, there have been many experimental and theoretical efforts invested in the development of SiC nanostructures [3][4][5]. Researchers [6][7][8] have proposed that thermal rectification effects are dependent on the size of the device and the asymmetric geometry. If phonons can be managed to transmit information as electrons and photons, thermal devices will also have more practical applications in phononic devices and the field of thermoelectric conversion.…”

Section: Introductionmentioning

confidence: 99%

Thermal Transport and Rectification Properties of Bamboo-Like SiC Polytypes Nanowires

Wang

2017

Journal of Nanomaterials

View full text Add to dashboard Cite

Bamboo-like SiC nanowires (NWs) have specific geometric shapes, which have the potential to suppress thermal conductivity by phonon boundary scattering. In this work, phonon transport behaviors in the 3C-SiC, 4H-SiC, and 6H-SiC crystal lattices are studied by the Monte Carlo (MC) method, including impurity scattering, boundary scattering, and Umklapp scattering. Phonon relaxation times for Umklapp (U) scattering for the above three SiC polytypes are calculated from the respective phonon spectra, which have not been reported in the literature. Diffuse boundary scattering and thermal rectification with different aspect ratios are also studied at different temperatures. It is found that the thermal conductivities of the bamboo-like SiC polytypes can be lowered by two orders of magnitude compared with the bulk values by contributions from boundary scattering. Compared with bamboo-like 4H-SiC and 6H-SiC NWs, 3C-SiC has the largest U scattering relaxation rate and boundary scattering rate, which leads to its lowest thermal conductivities. The thermal conductivity in the positive direction is larger than that in the negative direction because of its lower boundary scattering relaxation rate.

show abstract

“…To study the phonon transport across interface, the one-dimensional atomic junction model is an efficient choice, which uncovers the Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. phonon transport properties of the interface itself, including interfacial thermal conductance [23,24], phonon interference effect [25], nonlinear interaction [26], interfacial thermal rectification [27], etc. In addition, for the sake of high accuracy, it is better to combine the 1D atomic junction model with the scattering boundary method owing to the full consideration of the atomic details in actual interfacial structures.…”

Section: Introductionmentioning

confidence: 99%

Phonon quarters-wave loss

Xiong

Wang

2019

New J. Phys.

Self Cite

View full text Add to dashboard Cite

There has been a growing interest in the phase of phonon, due to the theoretical prediction (Phys. Rev. Lett. 115.11 (2015)) and the experimental observation (Science 359.6379 (2018)) of chiral phonons, which have different phases in different components. While half-wave loss is a well-known concept in optics, in this work, a series of plateaus of quarters-wave loss are first found for the reflected phonon across an interface by using an atomic junction model. These plateaus can be understood by the Smatrix in the system with time-reversal symmetry. If a phonon wave propagates from a low acousticimpedance material (or a low cutoff frequency material) to a higher one in the long-wave limit (or in the high frequency limit), a half-wave loss takes place for the reflected phonon; however, the plateau of half-wave loss for reflected phonon occurs in the whole frequency domain if phonon transfers to a material with a larger spring constant. Besides the half-wave loss, we also observe plateaus of quarterwave (three-quarters-wave) loss in long wave limit when the two leads with identical acoustic impedance are coupled by a weak (strong) coupling in comparison with the optimum thermal coupling. The quarters-wave loss for phonons can be applied to chiral phonon manipulation and other phononics devices.

show abstract

Nonlinearity enhanced interfacial thermal conductance and rectification

Cited by 33 publications

References 46 publications

Interfacial thermal transport with strong system-bath coupling: A phonon delocalization effect

Interfacial thermal transport with strong system-bath coupling: A phonon delocalization effect

Thermal Transport and Rectification Properties of Bamboo-Like SiC Polytypes Nanowires

Phonon quarters-wave loss

Contact Info

Product

Resources

About