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Band-Order Anomaly ...
Band-Order Anomaly at the gamma-Al2O3/SrTiO3 Interface Drives the Electron-Mobility Boost
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- Chikina, Alla (författare)
- Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.;Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus, Denmark.
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- Christensen, Dennis, V (författare)
- Tech Univ Denmark, Dept Energy Convers & Storage, DK-2800 Lyngby, Denmark.
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- Borisov, Vladislav (författare)
- Uppsala universitet,Materialteori,Goethe Univ Frankfurt Main, Inst Theoret Phys, D-60438 Frankfurt, Germany.
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- Husanu, Marius-Adrian (författare)
- Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.;Natl Inst Mat Phys, Magurele 077125, Romania.
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- Chen, Yunzhong (författare)
- Tech Univ Denmark, Dept Energy Convers & Storage, DK-2800 Lyngby, Denmark.;Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
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- Wang, Xiaoqiang (författare)
- Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
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- Schmitt, Thorsten (författare)
- Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
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- Radovic, Milan (författare)
- Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
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- Nagaosa, Naoto (författare)
- RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan.;Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan.
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- Mishchenko, Andrey S. (författare)
- RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan.
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- Valenti, Roser (författare)
- Goethe Univ Frankfurt Main, Inst Theoret Phys, D-60438 Frankfurt, Germany.
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- Pryds, Nini (författare)
- Tech Univ Denmark, Dept Energy Convers & Storage, DK-2800 Lyngby, Denmark.
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- Strocov, Vladimir N. (författare)
- Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
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Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland;Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus, Denmark. Tech Univ Denmark, Dept Energy Convers & Storage, DK-2800 Lyngby, Denmark. (creator_code:org_t)
- 2021-03-04
- 2021
- Engelska.
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Ingår i: ACS Nano. - : American Chemical Society (ACS). - 1936-0851 .- 1936-086X. ; 15:3, s. 4347-4356
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https://uu.diva-port... (primary) (Raw object)
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Abstract
Ämnesord
Stäng
- The rich functionalities of transition-metal oxides and their interfaces bear an enormous technological potential. Its realization in practical devices requires, however, a significant improvement of yet relatively low electron mobility in oxide materials. Recently, a mobility boost of about 2 orders of magnitude has been demonstrated at the spinel-perovskite gamma-Al2O3/SrTiO3 interface compared to the paradigm perovskite-perovskite LaAlO3/SrTiO3 interface. We explore the fundamental physics behind this phenomenon from direct measurements of the momentum-resolved electronic structure of this interface using resonant soft-X-ray angle-resolved photoemission. We find an anomaly in orbital ordering of the mobile electrons in gamma-Al2O3/SrTiO3 which depopulates electron states in the top SrTiO3 layer. This rearrangement of the mobile electron system pushes the electron density away from the interface, which reduces its overlap with the interfacial defects and weakens the electron-phonon interaction, both effects contributing to the mobility boost. A crystal-field analysis shows that the band order alters owing to the symmetry breaking between the spinel gamma-Al2O3 and perovskite SrTiO3. Band-order engineering, exploiting the fundamental symmetry properties, emerges as another route to boost the performance of oxide devices.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- transition-metal oxides
- heterostructures
- photoelectron spectroscopy
- electronic band structure
- electron-phonon interactions
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Chikina, Alla
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Christensen, Den ...
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Borisov, Vladisl ...
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Husanu, Marius-A ...
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Chen, Yunzhong
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Wang, Xiaoqiang
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Schmitt, Thorste ...
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Radovic, Milan
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Nagaosa, Naoto
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Mishchenko, Andr ...
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Valenti, Roser
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Pryds, Nini
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Strocov, Vladimi ...
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