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

Cheuk, Lawrence; Sommer, Ariel; Hadzibabic, Zoran; Yefsah, Tarik; Bakr, Waseem; Zwierlein, Martin

doi:10.1103/physrevlett.109.095302

Cited by 940 publications

(1,214 citation statements)

References 34 publications

Supporting

Mentioning

1,199

Contrasting

Unclassified

Order By: Relevance

“…Most experimental studies of spin-orbit coupling with ultracold atoms used two hyperfine ground states coupled by a two-photon Raman spin flip process [9][10][11][21][22][23][24] . All previous studies with bosons used 87 Rb [9][10][11] .…”

mentioning

confidence: 99%

A stripe phase with supersolid properties in spin–orbit-coupled Bose–Einstein condensates

Lee

Huang

et al. 2017

Nature

540

443

View full text Add to dashboard Cite

One such system is a Bose-Einstein condensate with spin-orbit coupling, which has a supersolid stripe phase 5-8 . Despite several recent studies of this system 9-11 , which studied the miscibility of the spin components 5 , the presence of stripes has not been detected. Here we report the direct observation of the predicted density modulation of the stripe phase using Bragg reflection. Our work establishes a system with * These authors contributed equally to this work. § junruli@mit.edu † Although the original observation of supersolidity 3 turned out to be caused by unusual elastic properties, experiments revealed quantum plasticity and mass supertransport, probably created by superfluid flow through the cores of interconnected dislocations 1,4

show abstract

mentioning

confidence: 99%

A stripe phase with supersolid properties in spin–orbit-coupled Bose–Einstein condensates

Lee

Huang

et al. 2017

Nature

540

443

View full text Add to dashboard Cite

show abstract

“…This fact maybe important for the experimental observation of the phenomena discussed here in the In short, the SOC leads to dramatic changes in essentially all the physical quantities such as the quantum phases, excitations spectra and universality classes of quantum and classical phase transitions. All the novel phenomena can be probed by various established experimental techniques [27][28][29][30][31][32][33]. For example, the collective excitations in the PM (Fig1b), SSDW and LSDW+CDW can be detected by the angle-resolved Bragg spectroscopy [31,32], the order parameters φ T /L in Fig.3 may be directly measured by the time of flight experiments, the evolution of the FS topology in Fig.6 can be monitored by spin-injection RF spectroscopy [33], In the appendix A, we contrast the collective modes in the paramagnet with the SOC which breaks the inversion symmetry and those in the conventional FM state without SOC which breaks the Time reversal symmetry.…”

Section: Summaries and Discussionmentioning

confidence: 99%

“…Near to the end of the paper, we briefly discuss the effects of the harmonic trap in observing these phenomena. In view of recent ground breaking experimental realizations of a 2d SOC [7][8][9][10], these new phenomena could be probed [27][28][29][30][31][32][33] in near future cold atom experiments and may also be relevant to some materials with SOC [4,18].…”

Section: Introductionmentioning

confidence: 99%

Itinerant magnetic phases and quantum Lifshitz transitions in a three-dimensional repulsively interacting Fermi gas with spin-orbit coupling

Zhang

Liu

2016

Phys. Rev. B

View full text Add to dashboard Cite

Magnetic phenomena in itinerant electron systems has been at the forefront in material science. Here we show that the Weyl spin-orbit couplings (SOC) in 3 dimensional repulsively interacting itinerant Fermi systems opens up a platform to host new itinerant magnetic phases, excitations and phase transitions. A putative Ferromagnetic state (FM) is always unstable against a stripe Spiral spin density wave (S-SDW) or a stripe Longitudinal-SDW at small or large SOC strengths respectively. The stripe ordering wavevector is given by the nesting momentum of the two SOC split Fermi surfaces with the same or opposite helicities at small or large SOC strengths respectively. The LSDW is accompanied by a charge density wave (CDW) with half of its pitch. The transition from the paramagnet to the SSDW or LSDW+CDW is described by quantum Lifshitz type actions, in sharp contrast to the Hertz-Millis types for itinerant electron systems without SOC. The collective excitations and FS re-constructions inside the SSDW and LSDW+CDW are also studied. The effects of a harmonic trap in cold atom experiments are briefly discussed. In view of recent groundbreaking experimental advances in generating 2d SOC in cold atoms, these phenomena can be observed in current or near future cold atom experiments even at very weak interactions. They may also be relevant to some itinerant magnetic materials with a strong SOC.

show abstract

“…A prominent example is the experimental realization of synthetic spinorbit coupling (SOC) in ultracold atomic gases [1][2][3]. When the atomic states are coupled with Raman lasers, the internal and external degrees of freedom of the atoms are also coupled.…”

Section: Introductionmentioning

confidence: 99%

Topological superradiant state in Fermi gases with cavity induced spin–orbit coupling

Pan

Liu

et al. 2017

Front. Phys.

View full text Add to dashboard Cite

Coherently driven atomic gases inside optical cavities hold great promise for generating rich dynamics and exotic states of matter. It was shown recently that an exotic topological superradiant state exists in a two-component degenerate Fermi gas coupled to a cavity, where local order parameters coexist with global topological invariants. In this work, we characterize in detail various properties of this exotic state, focusing on the feedback interactions between the atoms and the cavity field. In particular, we demonstrate that cavity-induced interband coupling plays a crucial role in inducing the topological phase transition between the conventional and topological superradiant states. We analyze the interesting signatures in the cavity field left by the closing and reopening of the atomic bulk gap across the topological phase boundary and discuss the robustness of the topological superradiant state by investigating the steady-state phase diagram under various conditions. Furthermore, we consider the interaction effect and discuss the interplay between the pairing order in atomic ensembles and the superradiance of the cavity mode. Our work provides many valuable insights into the unique cavity-atom hybrid system under study and is helpful for future experimental exploration of the topological superradiant state.

show abstract

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

Cited by 940 publications

References 34 publications

A stripe phase with supersolid properties in spin–orbit-coupled Bose–Einstein condensates

A stripe phase with supersolid properties in spin–orbit-coupled Bose–Einstein condensates

Itinerant magnetic phases and quantum Lifshitz transitions in a three-dimensional repulsively interacting Fermi gas with spin-orbit coupling

Topological superradiant state in Fermi gases with cavity induced spin–orbit coupling

Contact Info

Product

Resources

About