arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2008.07187cond-mat.mtrl-sci
收藏

(ZnSe-like)半导体混晶的声子配分及其压力诱导结构转变

Phonon-based partition of (ZnSe-like) semiconductor mixed crystals on approach to their pressure-induced structural transition

M. B. Shoker, O. Pagès, V. J. B. Torres, A. Polian, J. -P. Itié, G. K. Pradhan, C. Narayana, M. N. Rao, R. Rao, C. Gardiennet, G. Kervern, K. Strzałkowski, F. Firszt

摘要:

通用的1键:2模式渗滤型拉曼信号固有的常见的(A,B)C半导体混晶的锌(立方)结构的短键被利用作为一个敏感的介观,以探讨如何各种ZnSe为基础的系统从事他们的压力诱导结构转变(岩盐)在亚宏观尺度上的焦点ZnCdSe。拉曼双峰,区分AC-和BC-类环境的短键,是反应的压力:要么关闭(ZnBeSe,ZnSeS)或打开(ZnCdSe),这取决于硬化率的两个环境下的压力。II-VI族和III-V族混晶的分区相应地概述。特别感兴趣的是封闭的情况下,在该系统中共振稳定的过渡前在其例外点对应于一个虚拟的去耦,通过过阻尼,形成拉曼偶极子的两个振荡器。在这个极限下,短分子(作为次要分子)的链连接键沿着链冻结成刚性骨架。这揭示了合金化降低热导率的能力。

英文摘要:

The generic 1-bond:2-mode percolation type Raman signal inherent to the short bond of common (A,B)C semiconductor mixed crystals with zincblende (cubic) structure is exploited as a sensitive mesoscope to explore how various ZnSe-based systems engage their pressure-induced structural transition (to rock-salt) at the sub-macroscopic scale with a focus on ZnCdSe. The Raman doublet, that distinguishes between the AC- and BC-like environments of the short bond, is reactive to pressure: either it closes (ZnBeSe, ZnSeS) or it opens (ZnCdSe), depending on the hardening rates of the two environments under pressure. A partition of II-VI and III-V mixed crystals is accordingly outlined. Of special interest is the closure case, in which the system resonantly stabilizes ante transition at its exceptional point corresponding to a virtual decoupling, by overdamping, of the two oscillators forming the Raman doublet. At this limit, the chain-connected bonds of the short species (taken as the minor one) freeze along the chain into a rigid backbone. This reveals a capacity behind alloying to reduce the thermal conductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑