Bulletin of the American Physical Society
APS March Meeting 2013
Volume 58, Number 1
Monday–Friday, March 18–22, 2013; Baltimore, Maryland
Session G2: Invited Session: Superconductivity in Topological Insulators |
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Sponsoring Units: DCMP Chair: Nitin Samarth, Pennsylvania State University Room: Ballroom II |
Tuesday, March 19, 2013 11:15AM - 11:51AM |
G2.00001: High-temperature superconductivity in topological insulators Invited Speaker: Alex Hayat Interest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive Majorana fermion. However, all previously studied structures were based on low-T$_{\mathrm{c}}$ materials. We have produced high-temperature superconductivity in topological insulators Bi$_2$Se$_3$ and Bi$_2$Te$_3$ via proximity to Bi$_2$Sr$_2$CaCu$_2$O$_{\mathrm{8+\delta}}$, using our new mechanical bonding technique. We have shown proximity-induced superconductivity up to a temperature of at least 80K -- an order of magnitude higher than any previous observations. We have also demonstrated hybrid high-Tc-superconductor-semiconductor tunnel junctions combining Bi$_2$Sr$_2$CaCu$_2$O$_{\mathrm{8+\delta}}$ with graphite, with bulk semiconductors and with semiconductor quantum wells. Our approach provides a simple method of constructing high-T$_{\mathrm{c}}$ tunnel junctions which can conceptually facilitate tunneling spectroscopy studies of novel materials. [Preview Abstract] |
Tuesday, March 19, 2013 11:51AM - 12:27PM |
G2.00002: Topological superconductivity in IV-VI semiconductors Invited Speaker: Liang Fu |
Tuesday, March 19, 2013 12:27PM - 1:03PM |
G2.00003: The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films Invited Speaker: Jin-Feng Jia |
Tuesday, March 19, 2013 1:03PM - 1:39PM |
G2.00004: Gate-tuned superconducting transport at the surface of a topological insulator Invited Speaker: Alberto Morpurgo |
Tuesday, March 19, 2013 1:39PM - 2:15PM |
G2.00005: Majorana Bound States and Disclinations in Topological Crystalline Superconductors Invited Speaker: Jeffrey Teo We prove a topological criterion for the existence of zero-energy Majorana bound-state on a disclination, a rotation symmetry breaking point defect, in topological crystalline superconductors (TCS). We first establish a complete topological classification of TCS using the Chern invariant and a few integral rotation invariants. By analytically and numerically studying disclinations, we algebraically deduce a Z$_2$-index that identifies the parity of the number of Majorana zero-modes at a disclination. Surprisingly, we also find weakly-protected Majorana fermions bound at the corners of superconductors with trivial Chern and weak invariants. [Preview Abstract] |
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