Current-Induced Orbital Magnetization in Chiral Crystals

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  • らせん結晶における電流が誘起する軌道磁化
  • ラセン ケッショウ ニ オケル デンリュウ ガ ユウキ スル キドウ ジカ

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Abstract

<p>We theoretically study current-induced orbital magnetization in a chiral crystal, an orbital version of the Edelstein effect, using a simple tight-binding model of helical crystals. The induced magnetizations are opposite for right-handed and left-handed helices. We propose an analogy between the current-induced orbital magnetization and an Ampere field in a solenoid in classical electrodynamics. In order to quantify this effect, we define a dimensionless parameter from the response coefficient relating a current density with an orbital magnetization. This dimensionless parameter can be regarded as a number of turns within a unit cell when the crystal is regarded as a solenoid, and it represents how “chiral” the crystal is. We show that a Weyl semimetal with all the Weyl nodes close to the Fermi energy can have a large value of this dimensionless parameter, which can exceed that of a classical solenoid.</p>

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  • Butsuri

    Butsuri 72 (12), 872-877, 2017-12-05

    The Physical Society of Japan

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