Structural Phase Transitions in Crystals: Phonons as Higgs and Goldstone Excitations,Physica Status Solidi-Rapid Research Letters

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Structural Phase Transitions in Crystals: Phonons as Higgs and Goldstone Excitations
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-06-25 , DOI: 10.1002/pssr.202000265
Marco Vallone ₁

Affiliation

It has recently been indicated that optical and acoustic phonons can be identified with Higgs and Goldstone excitations of the crystal lattice arising from the spontaneous breaking of a global, continuous symmetry. Herein, this view is supported considering structural phase transitions induced by temperature, from the face‐centered‐cubic (fcc) phase of cobalt, and from the body‐centered‐cubic (bcc) phase of zirconium and titanium, to their hexagonal‐close‐packet (hcp) phase. The Higgs field potential is identified with the Ginzburg–Landau free energy difference calculated and available in the literature for the concerned structural phase transitions. In all the considered cases, the ensuing spontaneous symmetry breaking makes the optical phonon (identified with the Higgs mode) to arise only in the less symmetric hcp phase. This demonstrates Higgs excitations to be associated not only with quantum phase transitions, but also with structural phase transitions in natural crystals.

中文翻译：

晶体中的结构相变：声子作为希格斯和金石激发

最近已经表明，可以通过自发地破坏全局连续对称性而产生的晶格的希格斯和戈德斯通激发来识别光学和声学声子。在此，考虑到温度引起的结构相变（从钴的面心立方（fcc）相，锆和钛的体心立方（bcc）相到六方晶相），可以支持该观点。分组（hcp）阶段。希格斯场势可以通过金兹堡-兰道自由能差来确定，该差值可以通过计算得出，并可以从文献中获得，用于相关的结构相变。在所有考虑的情况下，随之而来的自发对称破坏使光子（以希格斯模式识别）仅在对称性较低的hcp相中出现。

更新日期：2020-06-25

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