Phonon thermal transport in two-dimensional gallium nitride: Role of higher-order phonon–phonon and phonon–electron scattering

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-03-21 DOI:10.1063/5.0256246

Jianshi Sun, Xiangjun Liu, Yucheng Xiong, Yuhang Yao, Xiaolong Yang, Cheng Shao, Renzong Wang, Shouhang Li

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引用次数: 0

Abstract

Two-dimensional gallium nitride (2D-GaN) has great potential in power electronics and optoelectronics. Heat dissipation is a critical issue for these applications of 2D-GaN. Previous studies have shown that higher-order phonon–phonon scattering has extremely strong effects on the lattice thermal conductivity (κlat) of 2D-GaN, with the fourth-order interatomic force constants (4th-IFCs) calculated using experienced atomic displacement in the finite difference method. In this work, it is found that the 4th-IFCs of 2D-GaN are quite sensitive to atomic displacement in the finite difference method. The effects of the four-phonon scattering can be severely overestimated with non-convergent 4th-IFCs. The κlat from three-phonon scattering is reduced by 65.6% due to four-phonon scattering. The reflection symmetry allows significantly more four-phonon processes than three-phonon processes. It was previously thought the electron–phonon interactions have significant effects on the κlat of two-dimensional materials. However, the effects of electron–phonon interactions on the κlat of both n-type and p-type 2D-GaN at high charge carrier concentrations can be neglected due to the few phonon–electron scattering channels and the relatively strong four-phonon scattering.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.