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Your search keyword '"SPIN polarization"' showing total 2 results
2 results on '"SPIN polarization"'

1. Identification of topological superconductivity in magnetic impurity systems using bulk spin polarization

Author

Kristofer Björnson, Mahdi Mashkoori, Saurabh Pradhan, Jonas Fransson, and Annica M. Black-Schaffer

Subjects
FOS: Physical sciences, Boundary (topology), 02 engineering and technology, Topology, 01 natural sciences, Superconductivity (cond-mat.supr-con), MAJORANA FERMIONS, Impurity, Condensed Matter::Superconductivity, 0103 physical sciences, Bound state, Topological order, 010306 general physics, Physics, Superconductivity, majorana fermions, Spin polarization, Condensed Matter - Superconductivity, 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik, topological superconductivity, 021001 nanoscience & nanotechnology, Condensed Matter Physics, states, MAJORANA, STATES, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Den kondenserade materiens fysik, Magnetic impurity
Abstract

Magnetic impurities on the surface of spin-orbit coupled but otherwise conventional superconductors provide a promising way to engineer topological superconductors with Majorana bound states as for boundary modes. In this work, we show that the spin-polarization in the interior of both one-dimensional impurity chains and two-dimensional islands can be used to determine the topological phase, as it changes sign exactly at the topological phase transition. This offers an independent probe of the topological phase, beyond the zero-energy Majorana bound states appearing at the boundaries of the topological region., 9 pages, 13 figures

Published
2020

2. Parity violation and new physics in superconductors.

Author

Hong, Deog Ki

Subjects
*ELECTROWEAK interactions, *SUPERCONDUCTORS, *ANDREEV reflection, *PHYSICS, *SPIN polarization, *NEUTRINO mass, *MAJORANA fermions
Abstract

We propose a new method, using the Andreev reflection at superconductors, to measure parity violation induced by the standard electroweak theory, which in turn constrains the possible parity-violating effects of new physics. The weak neutral currents induce parity-violating, marginal effective operators, though quite tiny, in superconductors. We estimate their effects on superconducting gaps and propose a method to measure the parity-violation from the spin polarization effect, when electrons or holes get Andreev-reflected at the interface between normal metal and a superconductor. Such polarization effects might be comparable to the atomic parity violation and thus naturally give an interesting bound on certain models of new physics, that couples to electrons, such as Majorana mass of active neutrinos or doubly charged Higgs. [ABSTRACT FROM AUTHOR]

Published
2020
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