Anomalous orbital structure in a spinel-perovskite interface

Yanwei Cao; Xiaoran Liu; Padraic Shafer; Srimanta Middey; Derek Meyers; Mikhail Kareev; Zhicheng Zhong; Jong Woo Kim; Philip J. Ryan; Elke Arenholz; Jak Chakhalian

doi:10.1038/npjquantmats.2016.9

Anomalous orbital structure in a spinel-perovskite interface

Yanwei Cao, Xiaoran Liu, Padraic Shafer, Srimanta Middey, Derek Meyers, Mikhail Kareev, Zhicheng Zhong, Jong Woo Kim, Philip J. Ryan, Elke Arenholz, Jak Chakhalian

School of Arts and Sciences, Physics & Astronomy

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

In all archetypical reported (001)-oriented perovskite heterostructures, it has been deduced that the preferential occupation of twodimensional electron gases is in-plane dxy state. In sharp contrast to this, the investigated electronic structure of a spinel-perovskite heterostructure γ-Al₂O₃/SrTiO₃ by resonant soft X-ray linear dichroism, demonstrates that the preferential occupation is in out-of-plane d_xz/d_yz states for interfacial electrons. Moreover, the impact of strain further corroborates that this anomalous orbital structure can be linked to the altered crystal field at the interface and symmetry breaking of the interfacial structural units. Our findings provide another interesting route to engineer emergent quantum states with deterministic orbital symmetry.

Original language	English (US)
Article number	16009
Journal	npj Quantum Materials
Volume	1
DOIs	https://doi.org/10.1038/npjquantmats.2016.9
State	Published - Aug 12 2016

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Anomalous orbital structure in a spinel-perovskite interface",

abstract = "In all archetypical reported (001)-oriented perovskite heterostructures, it has been deduced that the preferential occupation of twodimensional electron gases is in-plane dxy state. In sharp contrast to this, the investigated electronic structure of a spinel-perovskite heterostructure γ-Al2O3/SrTiO3 by resonant soft X-ray linear dichroism, demonstrates that the preferential occupation is in out-of-plane dxz/dyz states for interfacial electrons. Moreover, the impact of strain further corroborates that this anomalous orbital structure can be linked to the altered crystal field at the interface and symmetry breaking of the interfacial structural units. Our findings provide another interesting route to engineer emergent quantum states with deterministic orbital symmetry.",

author = "Yanwei Cao and Xiaoran Liu and Padraic Shafer and Srimanta Middey and Derek Meyers and Mikhail Kareev and Zhicheng Zhong and Kim, {Jong Woo} and Ryan, {Philip J.} and Elke Arenholz and Jak Chakhalian",

note = "Funding Information: We acknowledge numerous insightful theory discussions with Daniel Khomskii. J.C. was supported by the Gordon and Betty Moore Foundation EPiQS Initiative through Grant No. GBMF4534. Y.C., S.M. and M.K. were supported by the DOD-ARO under Grant No. 0402-17291. X.L. was supported by the Department of Energy Grant No. DE-SC0012375. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Publisher Copyright: {\textcopyright} The Author(s) 2016.",

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AU - Liu, Xiaoran

AU - Shafer, Padraic

AU - Middey, Srimanta

AU - Meyers, Derek

AU - Kareev, Mikhail

AU - Zhong, Zhicheng

AU - Kim, Jong Woo

AU - Ryan, Philip J.

AU - Arenholz, Elke

AU - Chakhalian, Jak

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PY - 2016/8/12

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N2 - In all archetypical reported (001)-oriented perovskite heterostructures, it has been deduced that the preferential occupation of twodimensional electron gases is in-plane dxy state. In sharp contrast to this, the investigated electronic structure of a spinel-perovskite heterostructure γ-Al2O3/SrTiO3 by resonant soft X-ray linear dichroism, demonstrates that the preferential occupation is in out-of-plane dxz/dyz states for interfacial electrons. Moreover, the impact of strain further corroborates that this anomalous orbital structure can be linked to the altered crystal field at the interface and symmetry breaking of the interfacial structural units. Our findings provide another interesting route to engineer emergent quantum states with deterministic orbital symmetry.

AB - In all archetypical reported (001)-oriented perovskite heterostructures, it has been deduced that the preferential occupation of twodimensional electron gases is in-plane dxy state. In sharp contrast to this, the investigated electronic structure of a spinel-perovskite heterostructure γ-Al2O3/SrTiO3 by resonant soft X-ray linear dichroism, demonstrates that the preferential occupation is in out-of-plane dxz/dyz states for interfacial electrons. Moreover, the impact of strain further corroborates that this anomalous orbital structure can be linked to the altered crystal field at the interface and symmetry breaking of the interfacial structural units. Our findings provide another interesting route to engineer emergent quantum states with deterministic orbital symmetry.

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Anomalous orbital structure in a spinel-perovskite interface

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