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Chiral Rashba Spin Textures in Ultra-Cold Fermi Gases



Ian B. Spielman, Jay Sau, Rajdeep Sensarma, Stephen Powell, Sankar Das Sarma


Spin-orbit coupling is an important ingredient in many recently discovered phenomena such as the spin-Hall effect and topological insulators. Of particular interest is topological superconductivity, with its potential application in topological quantum computation. The absence of disorder in ultra-cold atomic systems make them ideal for quantum computation applications, however, the spin-orbit (SO) coupling schemes proposed thus far are experimentally impractical owing to large spontaneous emission rates in the alkali fermions. In this paper, we develop a scheme to generate Rashba SO coupling with a low spontaneous emission extension to a recent experiment. We show that this scheme generates a Fermi surface spin texture for 40K atoms, which is observable in time-of-flight measurements. The chiral spin texture, together with conventional s-wave interactions leads to topological superconductivity and non-Abelian Majorana quasiparticles.
Physical Review B


Bose Einstein Condensation, quantum phase transitions


Spielman, I. , Sau, J. , Sensarma, R. , Powell, S. and Das, S. (2011), Chiral Rashba Spin Textures in Ultra-Cold Fermi Gases, Physical Review B, [online], (Accessed April 20, 2024)
Created April 21, 2011, Updated November 10, 2018