Influence of phonon focusing on the anisotropy of the drag thermopower in single-crystalline nanowires based on noble metals

IF 2.9 3区物理与天体物理 Q3 NANOSCIENCE & NANOTECHNOLOGY

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-05-23 DOI:10.1016/j.physe.2025.116298

I.I. Kuleyev, I.G. Kuleyev

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引用次数: 0

Abstract

We have investigated the influence of phonon focusing on the electron-phonon drag and thermopower in Au-, Ag-, and Cu-based nanowires at low temperatures. Also, we have examined the role of quasi-longitudinal and quasi-transverse phonons, as well as shear waves in the drag thermopower of the nanostructures. The anisotropy of the lattice drag thermopower, thermal conductivity, and phonon mean free paths in noble metal-based nanowires is analyzed in the Knudsen phonon gas flow regime. In this case, the drag thermopower of nanowires follows the temperature dependence

α_{drag} \sim T^{4}

, with a dominant contribution of the slow quasi-transverse t₂-mode for all heat flux directions. It is shown that, under conditions of competition between boundary and volume mechanisms of phonon relaxation, the anisotropy of the drag thermopower in Ag crystals decreases monotonically as the cross-section of nanowires increases and disappears when the cross-section is

D > 10^{2}

μm.

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声子聚焦对贵金属单晶纳米线拖曳热能各向异性的影响

我们研究了低温条件下声子聚焦对金、银、铜纳米线中电子-声子阻力和热功率的影响。此外，我们还研究了准纵向和准横向声子以及剪切波在纳米结构的拖拽热能中的作用。在Knudsen声子气体流动条件下，分析了贵金属纳米线中晶格阻力、热功率、导热系数和声子平均自由程的各向异性。在这种情况下，纳米线的拖拽热功遵循与温度相关的α拖拽~ T4模式，在所有热流方向上都以慢速准横向t2模式为主。结果表明，在声子弛豫的边界机制和体积机制相互竞争的条件下，银晶体中拖阻热能的各向异性随着纳米线截面的增大而单调减小，当纳米线截面为102 μm时消失。

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来源期刊

Physica E-low-dimensional Systems & Nanostructures 物理-纳米科技

CiteScore

7.30

自引率

6.10%

发文量

356

审稿时长

65 days

期刊介绍： Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, novel quantum states of matter such as topological insulators, and Weyl semimetals. Both theoretical and experimental contributions are invited. Topics suitable for publication in this journal include spin related phenomena, optical and transport properties, many-body effects, integer and fractional quantum Hall effects, quantum spin Hall effect, single electron effects and devices, Majorana fermions, and other novel phenomena. Keywords: • topological insulators/superconductors, majorana fermions, Wyel semimetals; • quantum and neuromorphic computing/quantum information physics and devices based on low dimensional systems; • layered superconductivity, low dimensional systems with superconducting proximity effect; • 2D materials such as transition metal dichalcogenides; • oxide heterostructures including ZnO, SrTiO3 etc; • carbon nanostructures (graphene, carbon nanotubes, diamond NV center, etc.) • quantum wells and superlattices; • quantum Hall effect, quantum spin Hall effect, quantum anomalous Hall effect; • optical- and phonons-related phenomena; • magnetic-semiconductor structures; • charge/spin-, magnon-, skyrmion-, Cooper pair- and majorana fermion- transport and tunneling; • ultra-fast nonlinear optical phenomena; • novel devices and applications (such as high performance sensor, solar cell, etc); • novel growth and fabrication techniques for nanostructures