Volume 138, Number 6, June 2022
|Number of page(s)||7|
|Section||Condensed matter and materials physics|
|Published online||07 July 2022|
High room temperature mobility in Al2O3/SrTiO3 heterostructures
1 Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Department of Physics, Tianjin University - Tianjin 300354, China
2 School of Material Science and Engineering, Hebei University of Technology - Tianjin 300130, China
3 School of Science, Tianjin University of Technology - Tianjin, 300384, China
4 State Key Laboratory of Infrared Physics, Chinese Academy of Sciences, Shanghai Institute of Technical Physics Shanghai 200083, China
(a) email@example.com (corresponding author)
Received: 28 November 2021
Accepted: 31 May 2022
Al2O3/SrTiO3 heterostructures have attracted wide attention because of high electron mobility at cryogenic temperatures. But very low room temperature mobility (typically less than 12 cm2V−1s−1) limits its potential application. Here, the Al2O3/SrTiO3 heterostructures are successfully prepared by the low-cost magnetron sputtering. We observed that room temperature mobility is gradually enhanced on increasing electron concentration, and a maximum of 41.1 cm2V−1s−1 is obtained. This can be attributed to the high electron concentration due to the longitudinal optical phonon scattering. Our findings not only offer a route to improve room temperature mobility of the SrTiO3-based heterostructures but also provide a new experimental method for fabricating Al2O3/SrTiO3 heterostructures.
© 2022 EPLA
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