Abstract
We study the electron transmission tuned by quantum gate in an Aharonov-Casher (AC) ring. Transmission probability is obtained as a function of the normalized textured electric fields and Fermi energy. We find that modulating electron wavefunction in the stub can drastically affects electron transmission through the ring system. As Fermi energy crosses every eigenenergy of the isolated stub, the phases of both anomalous and periodic oscillations of the AC conductance generally have abrupt change by π. On two sides of several special Fermi energies, both anomalous and periodic oscillations have no abrupt phase change and are in phase. The detailed characteristics of the anomalous oscillations are dependent on the difference between the tilt angle of the spin and that of textured electric field. By modulating external magnetic field applied to the stub, we present AC oscillations of spin-polarized conductance within adiabatic limit.
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Project supported by the Science Foundation of Shanghai Municipal Commission of Education (96AJ05)
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Shi, Ym., Xu, SY., Chen, Hd. et al. Transmission modulated by quantum gate in aharonov-casher ring. J. of Shanghai Univ. 3, 274–278 (1999). https://doi.org/10.1007/s11741-999-0003-x
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DOI: https://doi.org/10.1007/s11741-999-0003-x