Enhanced in-plane thermal conductivity of polar SrTiO3 by surface phonon polaritons within dual Reststrahlen band

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-07-21 DOI:10.1063/5.0280414

Tao Cheng, Huanhuan Zhao, Li Lin, Mingyi Ma, Linhua Liu, Jia-Yue Yang

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引用次数: 0

Abstract

As device miniaturization advances, efficient nanoscale heat dissipation becomes increasingly critical. Surface phonon polaritons (SPhPs) offer fast, long-range channels for thermal transport. Dual Reststrahlen band materials such as SrTiO3 provide a broader SPhPs-supporting frequency range (Δω) and greater potential for enhancing SPhPs-mediated thermal conductivity (κ), yet their underlying mechanisms remain elusive. Herein, we analytically solve the SPhPs dispersion relations to investigate the influence of dual Reststrahlen bands on κ of SrTiO3, considering the effects of dielectric asymmetry (Δε) between the top and bottom surfaces of the membrane, temperature, and doping. We find that the low-frequency Reststrahlen band contributes more than two orders of magnitude higher κ than that outside the bands. Moreover, elevated temperatures and heavy doping reduce κ due to increased optical losses and diminished lattice polarization, particularly within the low-frequency Reststrahlen band. These findings complement the current understanding of SPhPs-mediated heat transport and suggest an alternative strategy for thermal management in nanoscale systems.

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双Reststrahlen带表面声子极化子增强极性SrTiO3的面内热导率

随着器件小型化的发展，高效的纳米级散热变得越来越重要。表面声子极化子（SPhPs）为热传输提供了快速、长距离的通道。双Reststrahlen带材料如SrTiO3提供更宽的sphp支持频率范围（Δω）和更大的潜力，增强sphp介导的热导率（κ），但其潜在机制尚不清楚。本文考虑了薄膜上下表面介电不对称性（Δε）、温度和掺杂等因素的影响，解析求解了SPhPs色散关系，研究了双Reststrahlen带对SrTiO3 κ的影响。我们发现低频Reststrahlen频带的κ值比频带外的κ值高两个数量级以上。此外，由于光学损耗增加和晶格极化减弱，特别是在低频Reststrahlen波段内，温度升高和大量掺杂会降低κ。这些发现补充了目前对sphp介导的热传输的理解，并为纳米级系统的热管理提供了另一种策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.