Ultracold fermions with repulsive interactions

Ketterle, Wolfgang

doi:10.1051/epjconf/20135701001

Cited by 1 publication

(5 citation statements)

References 15 publications

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“…We have determined the parameters by numerically integrating Eq. (27) [η x,y can also be expressed analytically -see Eq. (30) below].…”

Section: Collective Excitations and Non-fermi Liquid Behaviormentioning

confidence: 99%

“…These points give rise to the Landau damping term in Eq. (27). The blue lines mark similar points where v(k) is aligned along x but the form factor sin φ k in Eq.…”

Section: Collective Excitations and Non-fermi Liquid Behaviormentioning

confidence: 99%

“…We present an alternative method to study the strongly interacting regime of cold Fermi gases with-out tuning too close to the Feshbach resonance. 27 In a spin-orbit coupled gas, the interactions are effectively enhanced due to the large density of states in the lowdensity limit. This is crucially different from tuning to the Feshbach resonance from the repulsive side, where the decay time to the bound state becomes very short.…”

Section: Introductionmentioning

confidence: 99%

“…28 Formation of molecules limits the range of accessible interaction strength and has prevented the observation of the ferromagnetic instability thus far. 27 This paper is organized as follows. Sec.…”

Section: Introductionmentioning

confidence: 99%

“…The red lines denote regions in which v(k) points along the x direction and perpendicular to q which is taken to be along y. These points give rise to the Landau damping term in Eq (27)…”

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confidence: 99%

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Ferromagnetic and nematic non-Fermi liquids in spin-orbit-coupled two-dimensional Fermi gases

Ruhman

Berg

2014

Phys. Rev. B

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We study the fate of a two-dimensional system of interacting fermions with Rashba spin-orbit coupling in the dilute limit. The interactions are strongly renormalized at low densities, and give rise to various fermionic liquid crystalline phases, including a spin-density wave, an in-plane ferromagnet, and a non-magnetic nematic phase, even in the weak coupling limit. The nature of the ground state in the low-density limit depends on the range of the interactions: for short range interactions it is the ferromagnet, while for dipolar interactions the nematic phase is favored. Interestingly, the ferromagnetic and nematic phases exhibit strong deviations from Fermi liquid theory, due to the scattering of the Fermionic quasi-particles off long-wavelength collective modes. Thus, we argue that a system of interacting fermions with Rashba dispersion is generically a non-Fermi liquid at low densities. I.arXiv:1408.6250v3 [cond-mat.str-el]

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“…We have determined the parameters by numerically integrating Eq. (27) [η x,y can also be expressed analytically -see Eq. (30) below].…”

Section: Collective Excitations and Non-fermi Liquid Behaviormentioning

confidence: 99%

“…These points give rise to the Landau damping term in Eq. (27). The blue lines mark similar points where v(k) is aligned along x but the form factor sin φ k in Eq.…”

Section: Collective Excitations and Non-fermi Liquid Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The red lines denote regions in which v(k) points along the x direction and perpendicular to q which is taken to be along y. These points give rise to the Landau damping term in Eq (27)…”

mentioning

confidence: 99%

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