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Specular Andreev Reflection In The Interface Of A Two-Dimensional Semiconductor With Rashba Spin-Orbit Coupling And A D-Wave Superconductor, Bo Lv, C Zhang, Zhongshui Ma
Specular Andreev Reflection In The Interface Of A Two-Dimensional Semiconductor With Rashba Spin-Orbit Coupling And A D-Wave Superconductor, Bo Lv, C Zhang, Zhongshui Ma
Faculty of Engineering - Papers (Archive)
We reveal that the recently discovered specular Andreev reflection (SAR) [C. W. J. Beenakker, Phys. Rev. Lett. 97, 067007 (2006)] can occur in semiconductors where the spin-orbit coupling is finite. We demonstrate this finding in the hybrid of a two-dimensional electron gas with Rashba spin-orbit coupling and a superconductor. In the limit of low density or a strong spin-orbit coupling, specular Andreev reflection is finite. We also show that unit electron-hole conversion is possible in a specular Andreev reflection due to the different topological structures of the equal-energy surface between electrons and holes. The SAR in the semiconductor is determined …
Structural Dependent Ultrafast Electron-Phonon Coupling In Multiferroic Bifeo 3 Films, Zuanming Jin, Yue Xu, Zhengbing Zhang, Gaofang Li, Xian Lin, Guohong Ma, Zhenxiang Cheng, Xiaolin Wang
Structural Dependent Ultrafast Electron-Phonon Coupling In Multiferroic Bifeo 3 Films, Zuanming Jin, Yue Xu, Zhengbing Zhang, Gaofang Li, Xian Lin, Guohong Ma, Zhenxiang Cheng, Xiaolin Wang
Faculty of Engineering - Papers (Archive)
The electronic energy relaxation of polycrystalline BiFeO3 films is studied using ultrafast pump-probe spectroscopy. After photo-excitation with femtosecond laser pulses, the relaxation of hot electrons is identified to decay with two different characteristic times. The fast process is attributed to scattering of electrons with lattice-vibration modes, and the slow one is corresponding to the spin-lattice thermalization. The electron-phonon coupling is characterized by the second moment of the Eliashberg function, khx2i. Due to the structural strain and symmetry breaking, the electron-phonon interaction strength of tetragonal BiFeO3 films is larger than that of rhombohedral counterparts