Nonlinear Phenomena in Complex Systems, 2007, Vol.10, No.2, pp.196-198

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2007, Vol.10, No.2, pp.196-198

Aharonov-Bohm Billiard with Triangular Stopper: a Possible Quantum Rectifier.
S. Masuda and K. Nakamura

The conductance of an open circular dot which has a central triangular stopper(CTS) encircling the Aharonov-Bohm (AB) flux(Φ) is studied. AB oscillation in conductance fluctuations depends on the rotation angle() of CTS as well as on Fermi energy (E_F). For Fermi wavelength (λ_F) comparable to the linear dimension (l) of CTS, the AB oscillation is extremely sensitive to . In the special case of up-and-down (UD) symmetric case (=0⁰), there appears a pair of conductance plateaus around Φ/Φ₀ being integers and half-integers (Φ₀: flux quantum). Therefore UD-symmetric case results in the conductance segregation. Noting that the UD-symmetric case corresponds to the right-and-left(RL)-asymmetric dot, we propose a purely quantum-mechanical rectifier working at low temperature under the alternating AB fluxes synchronized with AC voltage.
Key words: Aharonov-Bohm dot, conductance plateaus, triangular stopper, quantum-mechanical rectifier

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