Magnetically tunable Kondo-Aharonov-Bohm effect in a triangular quantum dot.
The role of discrete orbital symmetry in mesoscopic physics is manifested in a system consisting of three identical quantum dots forming an equilateral triangle. Under a perpendicular magnetic field, this system demonstrates a unique combination of Kondo and Aharonov-Bohm features due to an interplay between continuous [spin-rotation SU(2)] and discrete (permutation C3v) symmetries, as well as U(1) gauge invariance. The conductance as a function of magnetic flux displays sharp enhancement or complete suppression depending on contact setups.
Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
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Kuzmenko
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Kikoin
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Avishai