Phase switching in a voltagebiased AharonovBohm interferometer
Vadim I. Puller^{1} and Yigal Meir^{1,2}
^{1}Department of Physics, BenGurion University of the Negev, Beer Sheva 84105, Israel
^{2}The Ilse Katz Center for Meso and Nanoscale Science and Technology, BenGurion University, Beer Sheva 84105, Israel
(Received 12 December 2007; revised 24 February 2008; published 18 April 2008)
A^{ }recent experiment [M. Sigrist et al., Phys. Rev. Lett. 98, 036805^{ }(2007)] reported switches between 0 and in the phase^{ }of AharonovBohm (AB) oscillations of the twoterminal differential conductance through^{ }a twodot ring with increasing voltage bias. Using a simple^{ }model, where one of the dots contains multiple interacting levels,^{ }these findings are explained as a result of transport through^{ }the interferometer being dominated at different biases by quantum dot^{ }levels of different â€œparitiesâ€ (i.e., the sign of the overlap^{ }integral between the dot state and the states in the^{ }leads). The redistribution of electron population between different levels with^{ }bias leads to the fact that the number of switching^{ }events is not necessarily equal to the number of dot^{ }levels, in agreement with experiment. For the same reason, switching^{ }does not always imply that the parity of levels is^{ }strictly alternating. Lastly, it is demonstrated that the correlation between^{ }the first switching of the phase and the onset of^{ }the inelastic cotunneling, as well as the sharp (rather than^{ }gradual) change of phase when switching occurs, give reason to^{ }think that the present interpretation of the experiment is preferable^{ }to the one based on electrostatic AB effect.
Â©2008 The American Physical Society
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