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Thursday Thursday, October 25 Observation of neutral modes in the fractional quantum Hall regime Moty Heiblum Current propagates in the fractional quantum Hall effect (FQHE) regime along the edges of the two-dimensional-electron gas (2DEG) via chiral edge modes with a chirality dictated by the applied magnetic field. Early predictions suggested the presence of counter propagating edge modes for some fractional states, the so called, hole-conjugate states, such as ½
Thursday [3] B. A. Bernevig, T. L. Hughes, and S. -C. Zhang, Science 314, 1757 (2006). [4] M. Konig et al., Science 318, 766 (2007). [5] C.-X. Liu et al., Phys. Rev. B 83, 035407 (2011). [6] D. Chevallier et al., Phys. Rev. B 82, 155318 (2010). [7] B. J. Overbosch and C. Chamon, Phys. Rev. B 80, 035319 (2009). [8] J. C. Y. Teo and C. L. Kane, Phys. Rev. B 79, 235321 (2009). [9] A. Strom and H. Johannesson, Phys. Rev. Lett. 102, 096806 (2009). [10] T. L. Schmidt, Phys. Rev. Lett. 107, 096602 (2011). _________________________________________________________________________ Spinful Majorana fermions and magnetoelectricity in junctions of 1D quantum wiresuperconductor heterostructures Panagiotis Kotetes 1 , A. Shnirman 2 , G. Schön 1 1 Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe 2 Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, 76128 Karlsruhe Recently, the interest in topological quantum computing has grown due to the appearance of promising platforms for realizing the long sought Majorana fermions. Among the proposals that seem suitable for engineering Majorana fermions, the most prominent involves a 1D semiconducting quantum wire in proximity to a bulk s-wave superconductor, where in addition a Zeeman field is applied. Here we investigate the Josephson effect in TNT and NTN junctions, consisting of topological (T) and normal (N) phases of semiconductorsuperconductor 1D heterostructures in the presence of a Zeeman field [1]. A key feature of our setup is that, in addition to the variation of the phase of the superconducting order parameter, we allow the orientation of the magnetic field to change along the junction. We find a novel magnetic contribution to the Majorana Josephson coupling that permits the Josephson current to be tuned by changing the orientation of the magnetic field along the junction. We also predict that a spin current can be generated by a finite superconducting phase difference, rendering these materials potential candidates for spintronic applications. Finally, this new type of coupling not only constitutes a unique fingerprint for the existence of Majorana fermions but also provides an alternative pathway for manipulating and braiding topological qubits in networks of wires. [1] P. Kotetes, A. Shnirman, G. Schön, arXiv:1207.2691.
Page 1 and 2: 2012 22 Octobre 27 Octobre WORKSHOP
Page 3 and 4: Afternoon Morning Timetable Monday
Page 5 and 6: 15h50 - 16h20 Coffee Break 16h20 -
Page 7 and 8: Monday Abstracts Monday, October 22
Page 9 and 10: Monday Single-Electron Tunneling an
Page 11 and 12: Tuesday Tuesday, October 23 Random-
Page 13 and 14: Tuesday the energy level spacings a
Page 15 and 16: Tuesday Electron refrigeration by n
Page 17: Wednesday [4] K. Saito, G. Benenti,
Page 21 and 22: Thursday Electronic standing waves
Page 23 and 24: Friday Nanoscale inhomogeneities in
Page 25 and 26: Friday Electron focusing in graphem
Page 27 and 28: Friday molecules. We explain the or
Page 29 and 30: Posters Posters Ab-initio study of
Page 31 and 32: Posters Nonclassical photon-pair pr

nanoelectronics - Institut d'Études Scientifiques de Cargèse (IESC)

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