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arXiv 2510.02452cond-mat.mtrl-scicond-mat.mes-hallcond-mat.str-el
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在$d$-波非磁性铁电体中的自旋极化工程

Spin polarization engineering in $d$-wave altermagnets

Georgetown University(乔治城大学);Max Planck Institute for the Physics of Complex Systems(马克斯·普朗克复杂系统物理研究所);Uppsala University(乌普萨拉大学);Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology(挪威科技大学物理系量子自旋电子学中心);Max Planck Institute for Chemical Physics of Solids(马克斯·普朗克固体化学物理研究所);Institute of Physics, Czech Academy of Sciences(捷克科学院物理研究所)

Mohsen Yarmohammadi, Marco Berritta, Marin Bukov, Libor Šmejkal, Jacob Linder, Peter M. Oppeneer

AI总结:

本研究通过多场方法在$d$-波非磁性铁电体中实现自旋极化的可调和可切换控制,利用光学驱动、栅极和电场诱导不同方向的自旋极化,并发现自旋和能带选择性掺杂诱导手性光学活性。

摘要:

非磁性铁电体(altermagnets)尽管净磁化为零,却仍能宿主非常规的自旋极化带,但控制其自旋结构仍具挑战性。我们提出一种多场方法,利用栅极、光学驱动和平面电场,来在$d$-波非磁性铁电体中工程化自旋极化,从而实现多方向可调和可切换的自旋极化。光学驱动诱导出平面外($z$)极化,而栅极和平面电场则通过Edelstein效应分别产生$x$-和$y$-极化,所有这些都可通过实验检测。我们进一步发现,自旋和能带选择性掺杂诱导出手性光学活性,这是非磁性铁电体独有的特征。我们的方法为非磁性铁电体的自旋极化全面控制提供了灵活的途径。

英文摘要:

Altermagnets host unconventional spin-polarized bands despite zero net magnetization, but controlling their spin structure remains challenging. We propose a multi-field approach to engineer spin polarization in $d$-wave altermagnets using gating, optical driving, and in-plane electric fields, which enable tunable and switchable polarizations along multiple directions. Optical driving induces out-of-plane ($z$) polarization, while gating and in-plane fields generate $x$- and $y$-polarizations via the Edelstein effect, all of which are experimentally detectable. We further find that spin- and band-selective doping induces chiral optical activity, a feature unique to altermagnets. Our approach provides a versatile route for full control of spin polarization in altermagnets.

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。

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