Crystallization of bosonic quantum Hall states in a rotating quantum gas

Mukherjee, Biswaroop; Shaffer, Airlia; Patel, Parth; Yan, Zhenjie; Wilson, Cedric; Crépel, Valentin; Fletcher, R.; Zwierlein, Martin

doi:10.1038/s41586-021-04170-2

Cited by 39 publications

(27 citation statements)

References 57 publications

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“…Quantum fluids and their properties have been studied in several physical systems: liquid helium, [4,5] ultracold atoms, [11,12] photons in a nonlinear medium, [13] and exciton-polaritons in a microcavity based on either organic or inorganic materials. [14][15][16][17][18][19][20][21] Indeed, microcavity exciton-polaritons have known to be a powerful model system to explore intriguing signatures of quantum fluids especially in open-dissipative non-equilibrium settings.…”

Section: Introductionmentioning

confidence: 99%

Microcavity Exciton‐Polariton Quantum Spin Fluids

Yang

Kim

2022

Adv Quantum Tech

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Microcavity exciton-polaritons are attractive quantum quasi-particles resulting from strong light-matter coupling in a quantum-well-cavity structure. They have become one of the most stimulating solid-state material platforms to explore beautiful collective quantum phenomena originating from macroscopic coherence in condensation and superfluidity, Berezinskii-Kosterlitz-Thouless transition, and various topological excitations in the form of solitons, vortices, and skyrmions. They can also provide opportunities for the development of pioneering photonic devices by exploiting bistability and parametric scatterings due to strong nonlinearity that possess remarkable performance advantages of power-efficient operation, ultrafast response time, and scalable planar geometries. This story becomes profound and fascinating when the spins of excitons are taken into account, that can be directly accessed through light polarization states. The purpose of this review is to give central principles of microcavity exciton-polariton spins and their anisotropic interactions, which can couple with the effective magnetic fields from mode-splitting of microcavity photons and spin-dependent relaxation processes of quantum-well excitons. Furthermore, notable theoretical and experimental research activities are summarized to reveal extraordinary quantum phenomena of spin-resolved topological states and exotic spin textures and to devise novel spin-based photonic devices based on microcavity exciton-polaritons.

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Section: Introductionmentioning

confidence: 99%

Microcavity Exciton‐Polariton Quantum Spin Fluids

Yang

Kim

2022

Adv Quantum Tech

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“…Another remarkable work [31] showed that by a procedure named 'geometrical squeezing' by the authors, a gas of sodium atoms can be brought into a superfluid LLL state. Spontaneous crystalization of the resulting LLL condensate has been observed in [32].…”

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confidence: 99%

Surface waves and bulk Ruderman mode of a bosonic superfluid vortex crystal in the lowest Landau level

Jeevanesan¹,

Benzoni²,

Moroz³

2022

Preprint

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We determine and analyze collective normal modes of a finite disk-shaped two-dimensional vortex crystal formed in a compressible bosonic superfluid in an artificial magnetic field. Using the microscopic Gross-Pitaevskii theory in the lowest Landau level approximation, we generate vortex crystal ground states and solve the Bogoliubov-de Gennes equations for small amplitude collective oscillations. We find chiral surface waves that propagate at frequencies larger than those of the bulk Tkachenko modes. Furthermore, we study low frequency bulk excitations and identify a torsional Ruderman mode, which we find is well-described by a previously developed low-energy effective field theory.

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“…The fate of topological transport in the strongly correlated regime raises fundamental questions on the role of geometry in quantum many-body physics [1,2]. Recently, different platforms have emerged as possible probes for many-body transport beyond the traditional Hall response [3]; these include ultracold quantum gases [4][5][6][7][8][9], Rydberg atoms [10][11][12], and photonics [13][14][15]. A paradigm of quantised transport is the topological Thouless pump, which represents the one-dimensional, dynamic analogue of the quantum Hall effect [16].…”

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confidence: 99%