Experimental realization of two-dimensional synthetic spin-orbit coupling in ultracold Fermi gases
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AbstractSpin-orbit coupling (SOC) is central to many physical phenomena, including fine structures of atomic spectra and topological phases in ultracold atoms. Whereas, in general, SOC is fixed in a system, laser-atom interaction provides a means to create and control synthetic SOC in ultracold atoms(1). Despite significant experimental progress in this area(2-8), two-dimensional (2D) synthetic SOC, which is crucial for exploring two-and three-dimensional topological phases, is lacking. Here, we report the experimental realization of 2D SOC in ultracold K-40 Fermi gases using three lasers, each of which dresses one atomic hyperfine spin state. Through spin-injection radiofrequency (rf) spectroscopy(4), we probe the spin-resolved energy dispersions of the dressed atoms, and observe a highly controllable Dirac point created by the 2D SOC. These results constitute a step towards the realization of new topological states of matter.
All Author(s) ListHuang LH, Meng ZM, Wang PJ, Peng P, Zhang SL, Chen LC, Li DH, Zhou Q, Zhang J
Journal nameNature Physics
Volume Number12
Issue Number6
Pages540 - +
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics; Physics, Multidisciplinary

Last updated on 2020-25-10 at 01:56