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      Inelastic transitions and counterflow tunneling in double-dot quantum ratchets

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      Author(s)
      Moldoveanu, V.
      Tanatar, Bilal
      Date
      2010
      Source Title
      Physical Review B - Condensed Matter and Materials Physics
      Print ISSN
      1098-0121
      Publisher
      The American Physical Society
      Volume
      82
      Issue
      20
      Pages
      205312-1 - 205312-7
      Language
      English
      Type
      Article
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      214
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      Abstract
      The ratchet regime of unbiased double quantum dots driven out of equilibrium by an independently biased nearby detector has been theoretically studied using the nonequilibrium Keldysh formalism and the random-phase approximation for the Coulomb effects. When the detector is suitably biased the energy exchange between the two systems removes the Coulomb blockade on the double dot via inelastic interdot tunneling. The energy detuning determines whether the current flows in the same direction as the driving current (positive flow) or in the opposite direction (electronic counterflow). In both cases the intradot transitions lead to negative-differential conductance. Besides the ratchet contribution to the current we also single out a Coulomb drag component.
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      http://hdl.handle.net/11693/22139
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevB.82.205312
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      • Department of Physics 2485
      • Nanotechnology Research Center (NANOTAM) 1125
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