Emergent symmetry at superradiance transition of a Bose condensate in two crossed beam cavities

Wu, Zhigang; Chen, Yu; Zhai, Hui

doi:10.1016/j.scib.2018.04.008

Cited by 11 publications

(4 citation statements)

References 47 publications

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“…An analysis of the system in terms of a Ginzburg-Landau picture was carried out [188] including finite temperature effects and finite cavity-decay rates. The estimated non-zero effective mass of the Goldstone mode due to higher order scattering processes slightly breaks the U (1) symmetry (which is exactly restored only at the critical point [189]), giving rise to shallow minima in the Landau free-energy landscape. However, the high probability to escape these shallow minima due to the added noise from cavity losses restores the continuous symmetry.…”

Section: Coupled Order Parametersmentioning

confidence: 98%

Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics

Mivehvar,

Piazza,

Donner

et al. 2021

Preprint

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We review the recent developments and the current status in the field of quantum-gas cavity QED. Since the first experimental demonstration of atomic self-ordering in a system composed of a Bose-Einstein condensate coupled to a quantized electromagnetic mode of a high-Q optical cavity, the field has rapidly evolved over the past decade. The composite quantum-gas-cavity systems offer the opportunity to implement, simulate, and experimentally test fundamental solid-state Hamiltonians, as well as to realize non-equilibrium many-body phenomena beyond conventional condensed-matter scenarios. This hinges on the unique possibility to design and control in open quantum environments photon-induced tunable-range interaction potentials for the atoms using tailored pump lasers and dynamic cavity fields. Notable examples range from Hubbard-like models with long-range interactions exhibiting a lattice-supersolid phase, over emergent magnetic orderings and quasicrystalline symmetries, to the appearance of dynamic gauge potentials and nonequilibrium topological phases. Experiments have managed to load spin-polarized as well as spinful quantum gases into various cavity geometries and engineer versatile tunablerange atomic interactions. This led to the experimental observation of spontaneous discrete and continuous symmetry breaking with the appearance of soft-modes as well as supersolidity, density and spin self-ordering, dynamic spin-orbit coupling, and non-equilibrium dynamical self-ordered phases among others. In addition, quantum-gas-cavity setups offer new platforms for quantum-enhanced measurements. In this review, starting from an introduction to basic models, we pedagogically summarize a broad range of theoretical developments and put them in perspective with the current and near future state-of-art experiments.

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Section: Coupled Order Parametersmentioning

confidence: 98%

Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics

Mivehvar,

Piazza,

Donner

et al. 2021

Preprint

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“…работы [5][6][7][8][9][10][11]). Отметим, что исследователи сверхизлучательных фазовых переходов еще не обсуждали возможность существования рассматриваемых нами сильно асимметричных когерентных состояний, возникающих в неравновесных ансамблях активных центров (см., например, [12][13][14][15][16][17][18][19][20][21]). Актуальность теоретического и экспериментального исследований подобных состояний обусловлена как фундаментальным характером связанных с ними физических явлений в открывающейся новой области лазерной физики, так и возможностями различных применений когерентного излучения активных сред в системах с низкодобротными резонаторами, добротность и асимметрия свойств которых в существенной мере определяются самой активной средой посредством полуволновой решетки инверсии населенностей активных центров.…”

Section: Introductionunclassified

Структура И Особенности Автомодуляции Сверхизлучательных Состояний В Асимметричном Резонаторе Фабри-Перо

Кочаровская,

Кочаровский

2023

Физика И Техника Полупроводников

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The dependence of the structure and stability of strongly asymmetric stationary states of a superradiant laser with a slightly asymmetric low-Q Fabry-Perot cavity on its length, reflection factors of mirrors, and pumping level is studied. The states are related to a self-consistent inhomogeneous half-wavelength population inversion grating. The possibility of the existence of two dynamic phase transitions from a stationary (monochromatic) state of this type to a nonstationary one is established: 1) a dissipative superradiant transition to a regime with a quasi-continuous lasing spectrum (in a weakly asymmetric cavity) and 2) a self-modulation transition to a regime with a discrete lasing spectrum. It is shown that the latter can be caused by excitation of both polariton and electromagnetic laser modes due to resonant Rabi oscillations of active centers with a sufficiently long phase relaxation time.

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“…[1][2][3] Meanwhile, it also promotes advanced development of theory and experiment regarding steady state superradiance. [4][5][6][7][8] In recent years, superradiant phase transition in multiple cavity modes has been proposed and investigated, [9][10][11][12][13] with particular interests on the phase diagram and symmetry analysis. Moreover, the dynamics of Higgs and Goldstone modes have also been observed in multiple cavity systems.…”

mentioning

confidence: 99%

Dissipation-Driven Superradiant Phase Transition of a Two-Dimensional Bose–Einstein Condensate in a Double Cavity

Wu,

Yang,

Chen

et al. 2024

Chinese Phys. Lett.

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We study superradiant phase transitions in a hybrid system of a two-dimensional Bose-Einstein condensate of atoms and two cavities arranged with a tilt angle. By adjusting the loss rate of cavities, we map out the phase diagram of steady states within a mean field framework. We find that when the loss rates of the two cavities are different, superradiant transitions may not occur at the same time in the two cavities. A first-order phase transition is observed between the states with only one cavity in superradiance and both in superradiance. In the case of both cavities are superradiant, a net photon current is observed flowing from the cavity with small decay rate to the one with large decay rate. The photon current shows a non-monotonic dependence on the loss rate difference, owing to the competition of photon number difference and cavity field phase difference. Our findings can be realized and detected in experiments.

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Emergent symmetry at superradiance transition of a Bose condensate in two crossed beam cavities

Cited by 11 publications

References 47 publications

Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics

Cavity QED with Quantum Gases: New Paradigms in Many-Body Physics

Структура И Особенности Автомодуляции Сверхизлучательных Состояний В Асимметричном Резонаторе Фабри-Перо

Dissipation-Driven Superradiant Phase Transition of a Two-Dimensional Bose–Einstein Condensate in a Double Cavity

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