报告题目: |
Enhanced Rashba spin-orbit interaction in transition metal oxide heterostructure |
报告人: |
Suk Bum Chung |
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Seoul National University
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报告时间: |
2016-01-07 10:30 |
报告地点: |
Conference Hall 322, Science Building, Tsinghua University |
主办单位: |
高等研究院 |
简介: |
An intriguing feature of the two-dimensional electron gas (2DEG) emerging at the transition metal oxide surface is the Rashba spin-orbit interaction, the momentum-dependent spin splitting due to the broken inversion symmetry and atomic spin-orbit coupling. Although a large Rashba splitting is generally desirable for both scientific studies and practical applications, it has not been understood how we can maximally enhance this splitting. Here, we present a promising route to realize significant Rashba-type band splitting using a thin film heterostructure. Based on first-principles methods and analytic model analyses, a tantalate monolayer on BaHfO$_3$ is shown to host two-dimensional bands %with %considerable band splittings, originating from Ta $t_{2g}$ states with strong Rashba spin splittings at both the band minima and saddle points. An important factor in this enhanced splitting is the significant $t_{2g}$-$e_g$ interband coupling, which can generically arise when the inversion symmetry is maximally broken in the 2DEG on a transition metal oxide surface. Our results could be useful in realizing topological superconductivity at oxide surfaces. |
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