Quantum analogous spin states of ultrasonic guided waves

IF 3.8 2区 物理与天体物理 Q1 ACOUSTICS
Sourav Banerjee
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Abstract

In quantum mechanics, spin is a physical property that dominates the topological behaviors. While manifesting the spin states they reveal complex interaction of physical parameters in a topological media. The guided waves’ inherent spin states are made of real physical spin angular momentum from the superposition of elastic waves. Thus, here the elastic spin state that naturally manifests by the ultrasonic guided waves in an elastic wave guide is explained through quantum analogous perspective. Guided wave modes are the superposition of two longitudinally polarized and two transverse polarized elastic wave potentials propagating in diverging and converging pattern. Spin nature of transverse waves is well known. Spin nature of longitudinal waves is also recently being explored. However, due to the unique modal superposition of guided Rayleigh-Lamb wave modes the physical understanding of spin state is incomplete for the guided waves in a bounded media. Unlike only one hybrid spin states described in earlier works, guided waves may manifest total six with four well defined hybrid spin states explicitly derived and explained in this article. These six spin states play crucial role in the physics of spin-momentum locking of guided waves. Two spin states originated from the interaction of similar potentials and four hybris spin states originated from the interaction of potentials with different directions of wave vector and polarization vector, as emerged in guided waves. Understanding from fundamentals and exploiting the phenomena of spin-momentum locking in guided waves may have several applications in nondestructive evaluation.
超声导波的量子类似自旋态
在量子力学中,自旋是一种主导拓扑行为的物理特性。在表现自旋态时,它们揭示了拓扑介质中物理参数的复杂相互作用。导波的固有自旋态是由弹性波叠加的真实物理自旋角动量构成的。因此,这里通过量子类比的视角来解释超声导波在弹性波导中自然表现出的弹性自旋态。导波模式是以发散和收敛模式传播的两个纵向极化和两个横向极化弹性波势的叠加。横波的自旋性质是众所周知的。纵波的自旋性质最近也得到了探索。然而,由于导波雷利-兰姆波模式的独特模态叠加,对于有界介质中的导波,人们对自旋态的物理理解并不完整。与早期著作中描述的只有一种混合自旋态不同,导波可以表现出总共六种混合自旋态,其中四种定义明确的混合自旋态在本文中得到了明确的推导和解释。这六种自旋态在导波的自旋动量锁定物理学中起着至关重要的作用。两种自旋态源于相似电势的相互作用,四种混合自旋态源于波矢量和极化矢量方向不同的电势的相互作用,正如导波中出现的那样。从根本上理解和利用导波中的自旋动量锁定现象可能会在无损评估中得到一些应用。
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
Ultrasonics
Ultrasonics 医学-核医学
CiteScore
7.60
自引率
19.00%
发文量
186
审稿时长
3.9 months
期刊介绍: Ultrasonics is the only internationally established journal which covers the entire field of ultrasound research and technology and all its many applications. Ultrasonics contains a variety of sections to keep readers fully informed and up-to-date on the whole spectrum of research and development throughout the world. Ultrasonics publishes papers of exceptional quality and of relevance to both academia and industry. Manuscripts in which ultrasonics is a central issue and not simply an incidental tool or minor issue, are welcomed. As well as top quality original research papers and review articles by world renowned experts, Ultrasonics also regularly features short communications, a calendar of forthcoming events and special issues dedicated to topical subjects.
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