Directed transport in quantum Hall bilayers |
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Authors: | R. Khomeriki L. Tkeshelashvili T. Buishvili Sh. Revishvili |
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Affiliation: | 1. Department of Natural Sciences, Tbilisi State University, Chavchavadze ave. 3, Tbilisi, 0128, Georgia 2. Institut für Theoretische Festk?rperphysik, Universit?t Karlsruhe, 76128, Karlsruhe, Germany 3. Institute of Physics, Tamarashvili str. 6, Tbilisi, 0177, Georgia
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Abstract: | The pseudo-spin model for a double layer quantum Hall system with the total landau level filling factor ν=1 is discussed. In contrast to the “traditional” model where the interlayer voltage enters as a static magnetic field along pseudo-spin hard axis, taking into account the realistic experimental situation, in our model we interpret the influence of applied voltage as a source of additional relaxation process in the double layer system. We show that the Landau-Lifshitz equation for the considered pseudo-magnetic system well describes existing experimental data and reduces to the dc driven and damped sine-Gordon equation. As a result, the mentioned model predicts novel directed intra-layer transport phenomenon in the system. In particular, unidirectional intra-layer energy transport can be realized due to the motion of topological kinks induced by applied voltage. Experimentally this should be manifested as counter-propagating intra-layer inhomogeneous charge currents proportional to the interlayer voltage and total topological charge of the pseudo-spin system. |
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Keywords: | 73.43.Lp Collective excitations 05.45.Yv Solitons |
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