In-plane anisotropy in two-dimensional electron gas at LaAlO_3/SrTiO_3(110) interface |
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Affiliation: | Department of Physics, Beijing Normal University, Beijing 100875, China |
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Abstract: | A systematic study of the two-dimensional electron gas at LaAlO3/SrTiO3(110) interface reveals an anisotropy along two specific directions, [001] and [111]. The anisotropy becomes distinct for the interface prepared under high oxygen pressure with low carrier density. Angular dependence of magnetoresistance shows that the electron confinement is stronger along the [111] direction. Gate-tunable magnetoresistance reveals a clear in-plane anisotropy of the spin-orbit coupling, and the spin relaxation mechanism along both directions belongs to D'yakonov-Perel' (DP) scenario. Moreover, in-plane anisotropic superconductivity is observed for the sample with high carrier density, the superconducting transition temperature is lower but the upper critical field is higher along the [111] direction. This in-plane anisotropy could be ascribed to the anisotropic band structure along the two crystallographic directions. |
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Keywords: | oxide interfaces two-dimensional electron gas anisotropy |
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