Bulletin of the American Physical Society
2015 Annual Meeting of the APS Mid-Atlantic Section
Volume 60, Number 14
Friday–Sunday, October 23–25, 2015; Morgantown, West Virginia
Session C3: Majorana Nanowires |
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Chair: Tudor Stanesu, West Virginia University Room: Waterfront Hotel Salon E |
Sunday, October 25, 2015 9:24AM - 10:00AM |
C3.00001: Experimental subtleties and applications of Majorana modes to topological quantum computation. Invited Speaker: Jay Sau Majorana zero modes together topological superconductivity constitute one of the simplest routes to creating topologically protected degeneracy. What's most exciting is that there is already experimental evidence for such modes. In this talk, I will start by discussing subtleties that one must take into account when analyzing experiments promising for Majorana modes with an emphasis on the most recent experiments using STM, which promise Majorana modes [1,2]. I will then look forward into how one could go beyond the limitations of effectively "non-interacting" Majorana modes to create an Ising topological phase that can be used for topological quantum information processing [3]. [1] Dumitrescu et al. Phys. Rev. B 91, 094505 (2015) [2] Sau, Brydon, Phys. Rev. Lett. 115, 127003 (2015) [3] Barkeshli, Sau, arXiv:1509.07135 (2015). [Preview Abstract] |
Sunday, October 25, 2015 10:00AM - 10:12AM |
C3.00002: Differential Conductance in Semiconductor-Superconductor Hybrid Structures John Stenger, Tudor Stanescu We construct a theory for calculating the differential conductance in semiconductor-superconductor hybrid structures that accounts for both the current carried by quasiparticles in the bulk superconductor and the contributions due to proximity effects induced in the semiconductor. Starting with a Blonder-Tinkham-Klapwijk (BTK) type approach, we show that the superconductor degrees of freedom can be conveniently integrated out and replaced by an interface `Green function' determined by the properties of the superconductor and the original outgoing-wave boundary conditions corresponding to quasiparticle propagation. We find that the features present in the differential conductance are associated with both semiconductor and bulk superconductor spectral features, with a relative strength that depends on the parameters of the structure. We systematically investigate the dependence of the differential conductance on the parameters of the system, including coupling strength, semiconductor band occupancy, and barrier transparency, and correlate our findings with recent experimental measurements on proximity-coupled semiconductor wires. [Preview Abstract] |
Sunday, October 25, 2015 10:12AM - 10:48AM |
C3.00003: Search for additional signatures of Majorana fermions in semiconductor nanowires coupled to superconductors Invited Speaker: Sergey Frolov I will provide and update on the experiments in InSb nanowires coupled to superconductors. The talk will focus on tunneling experiments and the analysis of zero-bias peaks, induced gaps and methods of the preparation of clean transparent contacts between superconductors and semiconductors. Near term goals include the search for the closing of the topological superconducting gap, correlations between zero-bias features, phase diagrams of the topological states. [Preview Abstract] |
Sunday, October 25, 2015 10:48AM - 11:00AM |
C3.00004: Topological Nonsymmorphic Crystalline Superconductors Qing-Ze Wang, Chao-Xing Liu Topological superconductors possess a nodeless superconducting gap in the bulk and gapless zero energy modes, known as ``Majorana zero modes'', at the boundary of a finite system. In this work, we introduce a new class of topological superconductors, which are protected by nonsymmorphic crystalline symmetry and thus dubbed ``topological nonsymmorphic crystalline superconductors''. We construct an explicit Bogoliubov-de Gennes type of model for this superconducting phase in the D class and show how Majorana zero modes in this model are protected by glide symmetry. Furthermore, we generalize the classification of topological nonsymmorphic crystalline superconductors to the classes with time reversal symmetry, including the DIII and BDI classes, in two dimensions. Our theory provides a guidance to search for new topological superconducting materials with nonsymmorphic crystal structures. [Preview Abstract] |
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