Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
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DOI：
10.1103/physrevlett.102.016601
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发表时间：
2009-01-09
影响因子：
8.6
通讯作者：
Inoue, J.
中科院分区：
文献类型：
--
作者：
Kontani, H.;Tanaka, T.;Inoue, J.
在过渡金属及其化合物中，除了普通的自旋和电荷电流外，轨道自由度还会产生轨道电流。我们揭示了在过渡金属中观察到的相当大的自旋和反常霍尔效应源于轨道霍尔效应（OHE）。为了阐明这些新颖的霍尔效应的起源，提出了一个简单的周期性 s-d 杂化模型作为通用模型。巨大的正 OHE 源自轨道阿哈罗诺夫-玻姆相位因子，并诱导与费米能级自旋轨道极化成正比的自旋霍尔电导率，在超过（少于）半填充的金属中为正（负）。
In transition metals and their compounds, the orbital degrees of freedom gives rise to an orbital current, in addition to the ordinary spin and charge currents. We reveal that considerably large spin and anomalous Hall effects observed in transition metals originate from an orbital Hall effect (OHE). To elucidate the origin of these novel Hall effects, a simple periodic s-d hybridization model is proposed as a generic model. The giant positive OHE originates from the orbital Aharonov-Bohm phase factor, and induces spin Hall conductivity that is proportional to the spin-orbit polarization at the Fermi level, which is positive (negative) in metals with more than (less than) half filling.