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arXiv · 1205.3483

Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas

Lawrence W. Cheuk·Ariel T. Sommer·Zoran Hadzibabic·Tarik Yefsah·Waseem S. Bakr·Martin W. Zwierlein
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Abstract

The coupling of the spin of electrons to their motional state lies at the heart of recently discovered topological phases of matter. Here we create and detect spin-orbit coupling in an atomic Fermi gas, a highly controllable form of quantum degenerate matter. We reveal the spin-orbit gap via spin-injection spectroscopy, which characterizes the energy-momentum dispersion and spin composition of the quantum states. For energies within the spin-orbit gap, the system acts as a spin diode. To fully inhibit transport, we open an additional spin gap, thereby creating a spin-orbit coupled lattice whose spinful band structure we probe. In the presence of s-wave interactions, such systems should display induced p-wave pairing, topological superfluidity, and Majorana edge states.

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Lawrence W. Cheuk, Ariel T. Sommer, Zoran Hadzibabic, Tarik Yefsah, Waseem S. Bakr, Martin W. Zwierlein. 2012-05-15. Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas. https://doi.org/10.1103/physrevlett.109.095302

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