Strain Tunable Interface States at the LaAlO<sub>3</sub>/SrTiO<sub>3</sub> Interface
ORAL
Abstract
The LaAlO3/SrTiO3 (LAO/STO) interface exhibits novel emergent phenomena, including metal-insulator transition, strong Rashaba spin-orbit coupling[1] (SOC), and electron pairing without superconductivity[2]. These properties can usually be modified by gating and temperature. Here we introduce an additional knob of mechanical strain through a homemade amplified strain cell, which is equipped with a high-precision capacitance sensor and can continuously tune the LAO/STO interface to a strain as large as 1.5% at 1.5K. Accordingly, we observe a large tunability on carrier density, mobility, spin-orbit coupling, and electron correlations. Further combined with a milli-Kelvin atomic force microscope, our platform is promising to explore strain tunable behaviors in real space and by quantum transport at oxide interfaces.
*This work is supported by the National Natural Science Foundation of China under grant No. NSFC 11874054 and the University of Science and Technology of China under Grant No. WK3540000003, KY2030000160 and YD3540002001.
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Publication: [1] A. D. Caviglia. et al., Tunable Rashba Spin-Orbit Interaction at Oxide Interfaces. Phys. Rev. Lett. 104, 126803
[2] G. Cheng. et al., Electron pairing without superconductivity. Nature 521, 196-199 (2015).
Presenters
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Mengke Ha
- University of Science and Technology of China