期刊
ADVANCED ELECTRONIC MATERIALS
卷 7, 期 3, 页码 -出版社
WILEY
DOI: 10.1002/aelm.202001120
关键词
field effect; multiband transport; oxide interfaces
资金
- projects QUANTOX (QUANtum Technologies with 2D-OXides) of QuantERA ERA-NET Cofund in Quantum Technologies within 10th European Unions Horizon 2020 Programme [731473]
- MIUR PRIN 2017 [PRIN 20177SL7HC TOP-SPIN]
- Universita di Genova through the Fund for promoting European projects
This study investigates the irreversible effects of an applied electric field on the magnetotransport properties of LaAlO3/SrTiO3 conducting interfaces, with a focus on their multiband character. It is found that filling and depletion of the two bands follow very similar patterns in crystalline and amorphous samples, at least in qualitative terms, despite significant differences in carrier densities and mobilities.
In this work, the irreversible effects of an applied electric field on the magnetotransport properties of LaAlO3/SrTiO3 conducting interfaces are investigated, with focus on their multiband character. Samples of different types, namely with either crystalline or amorphous LaAlO3 overlayer, are studied. The two-band analysis highlights the similarity of the electronic properties of crystalline and amorphous interfaces, regardless much different carrier densities and mobilities. Furthermore, filling and depletion of the two bands follow very similar patterns, at least in qualitative terms, in the two types of samples. In agreement with previous works on crystalline interfaces, it is observed that an irreversible charge depletion takes place after application of a first positive back gate voltage step. Such charge depletion affects much more, in relative terms, the higher and three-dimensional d(yz), d(zx) bands than the lower and bidimensional d(xy), driving the system through the Lifshitz transition from two-band to single band behavior. The quantitative analysis of experimental data evidences the roles of disorder, apparent in the depletion regime, and temperature. Noteworthy, filling and depletion of the two bands follow very similar patterns in crystalline and amorphous samples, at least in qualitative terms, regardless much different carrier densities and mobilities.
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