2014
DOI: 10.1126/science.1255259
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Observation of Fermi surface deformation in a dipolar quantum gas

Abstract: The deformation of a Fermi surface is a fundamental phenomenon leading to a plethora of exotic quantum phases. Understanding these phases, which play crucial roles in a wealth of systems, is a major challenge in atomic and condensed-matter physics. Here, we report on the observation of a Fermi surface deformation in a degenerate dipolar Fermi gas of erbium atoms. The deformation is caused by the interplay between strong magnetic dipole-dipole interaction and the Pauli exclusion principle. We demonstrate the ma… Show more

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Cited by 103 publications
(179 citation statements)
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“…First, the ultracold experimental setups allow to tune the properties of the fermions and underlying lattice independently, which is rather challenging to realize in crystalline solids. Second, the anisotropic nature of DDI breaks the spatial symmetry of the system, manifesting itself in Fermi surface deformations [62][63][64] , as recently observed in experiment 65 . Here we show that, in the context of lattice systems, such deformations can be used to generate a Lifshitz transition, which, in turn, has a strong impact on the correlations in the system.…”
Section: Introductionmentioning
confidence: 69%
“…First, the ultracold experimental setups allow to tune the properties of the fermions and underlying lattice independently, which is rather challenging to realize in crystalline solids. Second, the anisotropic nature of DDI breaks the spatial symmetry of the system, manifesting itself in Fermi surface deformations [62][63][64] , as recently observed in experiment 65 . Here we show that, in the context of lattice systems, such deformations can be used to generate a Lifshitz transition, which, in turn, has a strong impact on the correlations in the system.…”
Section: Introductionmentioning
confidence: 69%
“…(7)- (12). The squared transition dipole moments appearing in the sum are extracted from theoretical Einstein coefficients using Eq.…”
Section: Dynamic Dipole Polarizabilitymentioning
confidence: 99%
“…During the past decade, fast progresses have been made in the experimental study of complicated magnetic atoms [1][2][3][4][5][6][7][8][9][10][11][12] and polar molecules [13][14][15]. In an ultrcold gas of these atoms or molecules, the interactions between particles include both a long-range dipole-dipole interaction (DDI) and a short-range interaction (SRI) (e.g., van der Waals interaction).…”
Section: Introductionmentioning
confidence: 99%