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教学与研究领域

研究领域在介观物理与量子信息。

主讲固体理论。近期的研究兴趣为电子在介观体系输运过程中的量子行为，量子电子器件中的电学响应函数以及多电子体系量子态的演化。可控与非门在量子器件中的实现等。研究方法主要为散射矩阵理论和非平衡格林函数场论方法。

Zhao, Xue-An
Professor
Ph. D. (1999), Hong Kong Univ.

Interests and Activities:
Main research interests are quantum transport phenomena in mesoscopic system, particularly on the charge response of the system to oscillating external potential. Using scattering methods to investigate the ac conductance and weekly nonlinear conductance and the dispassive effects in coherent transportation. In the transport problem, use the density of states and the notion of partial density of states in real application of devices. Study quantum information in mesoscopic device and to explore useful controlled-not mechanism.

Selected publications:

1)"Tansmission, S-matrix and partial densities of states for ac transport through a resonant cavity with multileads"     Phys. Rev.  B  66(2002)045321  Xuean Zhao, Guo-jun Jin, Qi-nian Zhou and You-quan Li

2)"Role of the internal potential in current conservation and gauge-invariant low-frequency dynamic mesoscopic transport" Phys. Rev. B  64 (2001)085326  Xuean Zhao and Yi-Xin Chen

3)"ac conductance of a magnetic multilayer structure with internal potential"    Phys. Rev. B  68 (2003) 054407.  Jie Yao,  Xuean Zhao, Guojun Jin, and Yuqiang Ma

4) "Admittance of one-dimensional double-barrier resonant tunneling nanostructure"    Phys. Rev. B  65(2002)235315  W. Z. Shangguan, T. C. Au Yeung, Y. B. Yu,and Xuean Zhao

5) "Application of  Nonlinear Dynamical Admittance In Nanostructures",    J. Phys. D: Appl. Phys. 34(2001)1032  Xuean Zhao, T. C. Au Yeung.

6) "Spin filtering through multi-detal-magnetic-barrier structures"    Semicond. Sci. Technol. 19 (2004) 930  Yuhang Chen, Xuean Zhao, and You-Quan Li.

7)"Entanglement of two-qutrit system"    The European Physical Journal B 44 (2005)359   Guo-Qiang Zhu, Xuean Zhao, and You-Quan Li.

9)"Electrochemical capacitance of a leaky capacitor"    Phys. Rev. B 60, 6730 (1999). Xuean Zhao, Jian Wang and Hong Guo

10) "Nonlinear quantum capacitance" Appl. Phys. Lett. 74, 2887 (1999). Baigeng Wang, Xuean Zhao , Jian Wang and Hong Guo

11) "Berry phase and shot noise for spin-polarized and entangled electrons" Physics Letters A 360 (2007) 486–490 Pei Wang, Wei-hua Tang, Ding-hui Lu, Lixia Jiang, Xuean zhao

12) "Spin transmission in a series of magnetic barrier structure" Physica B 389 (2007) 281–287 Hai-jun Zhang, Wei-hua Tang, Xuean Zhao

13) "Nonvanishing spin Hall currents in the presence of mag1netic impurities" Phys. Rev. B 75, 075326 (2007) Pei Wang, You-Quan Li, and Xuean Zhao