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Published on: November 11, 2013
Experimental demonstration of the time reversal Aharonov-Casher effect
Tobias Bergsten1, Toshiyuki Kobayashi, Yoshiaki Sekine
1NTT Basic Research Labs, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan.
Abstract:
We demonstrate the time reversal Aharonov-Casher (AC) effect in small arrays of mesoscopic semiconductor rings. By using an electrostatic gate we can control the spin precession rate and follow the AC phase over several interference periods. We show that we control the precession rate in two different gate voltage ranges; in the lower range the gate voltage dependence is strong and linear and in the higher range the dependence in almost an order of magnitude weaker. We also see the second harmonic of the AC interference, oscillating with half the period. We finally map the AC phase to the spin-orbit interaction parameter alpha and find it is consistent with Shubnikov-de Haas analysis.
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Basic Operations on Signals
Time Reversal mirrors a continuous-time signal about the vertical axis at t=0. This is achieved by substituting t with −t. For example, if a signal x(t) is considered, the time-reversed signal is x(−t). This operation can be graphically represented, showing the mirrored signal.
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