Impurity-induced Friedel oscillations in altermagnets and𝑝-wave magnets

IF 3.7 2区 物理与天体物理 Q1 Physics and Astronomy
Pavlo Sukhachov, Jacob Linder
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引用次数: 0

Abstract

We investigate the Friedel oscillations of the local density of states (LDOS) induced by a single impurity with both a spin-independent potential and an exchange coupling to the electrons in altermagnets and unconventional 𝑝-wave magnets. We identify features that make the Friedel oscillations and magnetization distinct from other materials with nontrivial spin texture such as Rashba metals. Because time-reversal symmetry is broken in altermagnets, both magnetic and nonmagnetic impurities lead to local magnetization with the spatial pattern that reflects the symmetry of the altermagnetic splitting. The period of the corresponding oscillations provides an alternative way to quantify the altermagnetic spin splitting and the shape of the altermagnetic bands. The LDOS pattern in 𝑝-wave magnets, which respect combined time-reversal and translation symmetries, is rich. It reveals anisotropy related directly to the spin splitting, but surprisingly also features LDOS oscillations with a doubled period in the proximity of the impurity. The latter effect is also observed in a Rashba metal with an exchange field and originates from the interplay of propagating and evanescent waves. The obtained results are instrumental for investigating altermagnets and unconventional 𝑝-wave magnets via tunneling probes.
变磁体和𝑝波磁体中杂质诱发的弗里德尔振荡
我们研究了由单一杂质诱导的局部态密度(LDOS)的弗里德尔振荡,该杂质同时具有与自旋无关的势能以及与改磁体和非常规𝑝波磁体中电子的交换耦合。我们发现了弗里德尔振荡和磁化与其他具有非对称自旋纹理的材料(如拉什巴金属)不同的特征。由于时间反转对称性在变磁体中被打破,磁性和非磁性杂质都会导致局部磁化,其空间模式反映了变磁体分裂的对称性。相应振荡的周期为量化改磁自旋分裂和改磁带的形状提供了另一种方法。𝑝波磁体的 LDOS 模式非常丰富,它尊重时间反转和平移对称性。它揭示了与自旋分裂直接相关的各向异性,但令人惊讶的是,在杂质附近还出现了周期加倍的 LDOS 振荡。在具有交换场的拉什巴金属中也观察到了后一种效应,它源于传播波和蒸发波的相互作用。获得的结果有助于通过隧道探针研究变磁体和非常规𝑝波磁体。
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来源期刊
Physical Review B
Physical Review B 物理-物理:凝聚态物理
CiteScore
6.70
自引率
32.40%
发文量
0
审稿时长
3.0 months
期刊介绍: Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter
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