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Applied Physics 2026
节线半金属中的Imbert-Fedorov位移
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Abstract:
我们研究结线半金属(nodal-line semimetal, NLSM)电子在阶跃势垒界面上的散射所产生的Imbert-Fedorov (IF)横向位移。考虑含质量项Δ的两带有效模型，其法向动量由界面势垒决定。由于其特殊的轮胎形费米面，从而在反射端出现两束反射波。我们分别采用(1) 波包中心方法与(2) 基于Berry曲率的半经典方法计算各反射束的IF位移，并给出两种方法在绝热散射条件下的等价性。
We investigate the Imbert-Fedorov (IF) transverse shift arising from the scattering of electrons in a nodal-line semimetal (NLSM) at a step-like potential barrier interface. We consider an effective two-band model with a mass term Δ, where the in-plane momentum is conserved while the normal momentum is determined by the interfacial barrier. Owing to the characteristic torus-like Fermi surface of NLSMs, two reflected beams can emerge on the reflection side. We calculate the IF shift for each reflected beam using (1) the wave-packet center (stationary-phase) approach and (2) a semiclassical approach based on Berry curvature, and demonstrate the equivalence of the two methods in the adiabatic scattering regime. This framework provides a unified starting point for systematically exploring how the mass term and incident energy control the IF shift through numerical parameter scans.
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