Spectral properties and phase diagram of correlated lattice bosons in an optical cavity within bosonic dynamical mean-field theory

Panas, Jaromir; Kauch, Anna; Byczuk, Krzysztof

doi:10.1103/physrevb.95.115105

Cited by 27 publications

(24 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the discrete even-odd symmetry of the lattice is broken, the energy landscape shows two global minima at Θ/N = ±1. In the region around U l /U s ≈ 0.5 this model shows metastable behavior [31,32]. Here the MI state is a local minimum in the free energy landscape, separated from the CDW states by an energy barrier, which results from the competition between strong interactions of short-and global-range character.…”

Section: Toy Modelmentioning

confidence: 99%

Metastability and avalanche dynamics in strongly correlated gases with long-range interactions

Hruby

Dogra

Landini

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

We experimentally study the stability of a bosonic Mott insulator against the formation of a density wave induced by long-range interactions and characterize the intrinsic dynamics between these two states. The Mott insulator is created in a quantum degenerate gas of 87-Rubidium atoms, trapped in a 3D optical lattice. The gas is located inside and globally coupled to an optical cavity. This causes interactions of global range, mediated by photons dispersively scattered between a transverse lattice and the cavity. The scattering comes with an atomic density modulation, which is measured by the photon flux leaking from the cavity. We initialize the system in a Mott-insulating state and then rapidly increase the global coupling strength. We observe that the system falls into either of two distinct final states. One is characterized by a low photon flux, signaling a Mott insulator, and the other is characterized by a high photon flux, which we associate with a density wave. Ramping the global coupling slowly, we observe a hysteresis loop between the two states-a further signature of metastability. A comparison with a theoretical model confirms that the metastability originates in the competition between short- and global-range interactions. From the increasing photon flux monitored during the switching process, we find that several thousand atoms tunnel to a neighboring site on the timescale of the single-particle dynamics. We argue that a density modulation, initially forming in the compressible surface of the trapped gas, triggers an avalanche tunneling process in the Mott-insulating region.

show abstract

Section: Toy Modelmentioning

confidence: 99%

Metastability and avalanche dynamics in strongly correlated gases with long-range interactions

Hruby

Dogra

Landini

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…The study has to be done separately for the distinct cases corresponding to the different possible thermodynamic phases [18][19][20][21][22][23][24]. In fact, the model allows for four different ground state phases depending on the preservation or breaking of two different symmetries.…”

Section: Manifestation Of the Multiplicative Noise In The Differementioning

confidence: 99%

“…The effective Hamiltonian corresponds to the family of bosonic Hubbard-type lattice models extended to include the cavity field mode [16]. In these Hamiltonian systems exotic new phases of lattice bosons appear due to the cavity mediated global-range interactions [17][18][19][20][21][22][23][24][25][26][27][28]. In fermionic lattices, cavity-induced topologically nontrivial [29][30][31] states can be generated.…”

Section: Introductionmentioning

confidence: 99%

Quantum noise in a transversely-pumped-cavity Bose-Hubbard model

et al. 2018

View full text Add to dashboard Cite

We investigate the quantum measurement noise effects on the dynamics of an atomic Bose lattice gas inside an optical resonator. We describe the dynamics by means of a hybrid model consisting of a Bose-Hubbard Hamiltonian for the atoms and a Heisenberg-Langevin equation for the lossy cavity field mode. We assume that the atoms are prepared initially in the ground state of the lattice Hamiltonian and then start to interact with the cavity mode. We show that the cavity field fluctuations originating from the dissipative outcoupling of photons from the resonator lead to vastly different effects in the different possible ground state phases, i.e., the superfluid, the supersolid, the Mott-and the charge-density-wave phases. In the former two phases with the presence of a superfluid wavefunction, the quantum measurement noise appears as a driving term leading to depletion of the ground state. The time scale for the system to leave the ground state is presented in a simple analytical form. For the latter two incompressible phases, the quantum noise results in the fluctuation of the chemical potential. We derive an analytical expression for the corresponding broadening of the quasiparticle resonances. arXiv:1803.06014v2 [cond-mat.quant-gas]

show abstract

“…Already for a single-mode cavity, which mediates global-range interactions, a rich phase diagram has been experimentally observed, featuring, besides the known superfluid and Mott-insulating phases, a lattice supersolid as well as an incompressible density-wave phase [3]. Such experiments implement a Bose-Hubbard (BH) model extended by a global-range sign-changing interaction, which has been intensively studied in recent years [4][5][6][7][8][9][10][11][12][13][14].…”

mentioning

confidence: 99%

Light-induced quantum droplet phases of lattice bosons in multimode cavities

Karpov,

Piazza

2021

Preprint

View full text Add to dashboard Cite

Multimode optical cavities can be used to implement interatomic interactions which are highly tunable in strength and range. For bosonic atoms trapped in an optical lattice, cavity-mediated interactions compete with the short-range interatomic repulsion, which we study using an extended Bose-Hubbard model. Already in a single-mode cavity, where the corresponding interaction has an infinite range, a rich phase diagram has been experimentally observed, featuring density-wave and supersolid self-organized phases in addition to the usual superfluid and Mott insulator. Here we show that, for any finite range of the cavity-mediated interaction, quantum self-bound droplets dominate the ground state phase diagram. Their size and in turn density is not externally fixed but rather emerges from the competition between local repulsion and finite-range attraction. Therefore, the phase diagram becomes very rich, featuring both compressible superfluid/supersolid as well as incompressible Mott and density-wave droplets. Additionally, we observe droplets with a compressible core and incompressible outer shells.

show abstract

Spectral properties and phase diagram of correlated lattice bosons in an optical cavity within bosonic dynamical mean-field theory

Cited by 27 publications

References 38 publications

Metastability and avalanche dynamics in strongly correlated gases with long-range interactions

Metastability and avalanche dynamics in strongly correlated gases with long-range interactions

Quantum noise in a transversely-pumped-cavity Bose-Hubbard model

Light-induced quantum droplet phases of lattice bosons in multimode cavities

Contact Info

Product

Resources

About