Two-dimensional dipolar Bose gas with the roton-maxon excitation spectrum

Boudjemâa, Abdelâali; Shlyapnikov, G. V.

doi:10.1103/physreva.87.025601

Cited by 64 publications

(131 citation statements)

References 44 publications

Supporting

Mentioning

123

Contrasting

Order By: Relevance

“…The field operator of noncondensed particles transforms aŝ ψ(r) = (1/V ) kâ k e ik.r with V being the system volume, and the DDI potential takes the formṼ d (k) = C dd (3 cos 2 θ k − 1)/3 [1,23], where the vector k represents the momentum transfer imparted by the collision.…”

Section: Uniform Casementioning

confidence: 99%

“…If the DDI vanishes (h 3 (ǫ dd = 0) = 1), the validity criterion of the theory becomes √ n c a 3 (1 + g 3 n c /g 2 ) 3/2 ≪ 1 at T = 0, and (T /g 2 n c ) √ n c a 3 (1 + g 3 n c /g 2 ) −1/2 ≪ 1 at T ≪ g 2 n c . Corrections to the chemical potential due to the quantum and thermal fluctuations are given by [23,25] …”

Section: Uniform Casementioning

confidence: 99%

“…Ground-state and excitedstate properties of such systems have also been extensively explored (see e.g. [14][15][16][17][18][19][20][21][22][23][24][25][26]). …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantum dilute droplets of dipolar bosons at finite temperature

Boudjemâa¹

2017

Annals of Physics

Self Cite

View full text Add to dashboard Cite

We systematically study the properties of dipolar Bose gases with two-and three-body contact interactions at finite temperature using the Hartree-Fock-Bogoliubov-Popov approximation. In uniform case, we obtain an exciting new extension of the seminal Lee-Huang-Yang corrected equation of state that depends explicitly on the thermal fluctuations and on the coupling constant of the three-body interaction. We investigate, on the other hand, the effects of thermal fluctuations on the occurrence and stability of a droplet state in a Bose-Einstein condensate with strong dipole-dipole interactions. We find that at finite temperature, the droplet phase appears as a narrow peak surrounded by a broader thermal halo. We show that the number of particles inside the droplet decays with increasing temperature.

show abstract

Section: Uniform Casementioning

confidence: 99%

Section: Uniform Casementioning

confidence: 99%

See 1 more Smart Citation

Quantum dilute droplets of dipolar bosons at finite temperature

Boudjemâa¹

2017

Annals of Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…(1) corresponds to the kinetic energy, the third one to the contact three-body repulsion (g 3 > 0), and the two-body interaction Hamiltonian H 2 at low energies can be substituted by an effective momentumdependent (pseudo)potential (see, e.g., Ref. [35])…”

mentioning

confidence: 99%

Stable Dilute Supersolid of Two-Dimensional Dipolar Bosons

et al. 2015

View full text Add to dashboard Cite

We consider two-dimensional bosonic dipoles oriented perpendicularly to the plane. On top of the usual two-body contact and long-range dipolar interactions we add a contact three-body repulsion as expected, in particular, for dipoles in the bilayer geometry with tunneling. The three-body repulsion is crucial for stabilizing the system, and we show that our model allows for stable continuous space supersolid states in the dilute regime and calculate the zero-temperature phase diagram.

show abstract

“…Rotonization of the spectrum implies a dynamical instability [23,26,27]. In the frame of the model (6) the system would collapse [28].…”

mentioning

confidence: 99%

Resonant pairing of excitons in semiconductor heterostructures

Андреев

2016

Phys. Rev. B

View full text Add to dashboard Cite

We suggest indirect excitons in 2D semiconductor heterostructures as a platform for realization of a bosonic analog of the Bardeen-Cooper-Schrieffer superconductor. The quantum phase transition to a biexcitonic gapped state can be controlled in situ by tuning the electric field applied to the structure in the growth direction. The proposed playground should allow one to go to strongly correlated and high-temperature regimes, unattainable with Feshbach resonant atomic gases.PACS numbers: 71.35. Lk, 34.50.Cx, 67.10.Ba, 74.10.+v The phenomenon of resonant pairing lies at the heart of superconductivity in metals. Here Cooper pairs of fermionic particles -electrons, can Bose-Einstein condense to carry electric charge without dissipation. In-depth study of this scenario, commonly known as Bardeen-CooperSchrieffer (BCS) theory, has been performed by using the technique of Feshbach resonances (FR's) in ultracold atomic gases. In Fermi gases this technique has allowed for observation of a crossover from a BCS-like state made of spatially overlapping pairs of atoms to a BoseEinstein condensate (BEC) of tightly bound diatomic molecules [1][2][3][4][5]. This so-called BCS-BEC crossover has become a paradigm of the many-body physics, sharing important analogies with high-temperature superconductivity [6] and neutron stars [7][8][9].A natural idea expounded in a series of papers [10] has been to apply the same FR technique to degenerate Bose gases. It has been shown that in the case of bosons the smooth crossover is replaced by a thermodynamically sharp phase transition from a coherent mixture of atoms and molecules to a pure molecular superfluid [11]. The latter is distinguished by the absence of atomic offdiagonal long-range order and gapped atomic excitations. Though being of great fundamental interest on its own right, until now this research has not met its applicationoriented counterpart in the physics of solid state. Moreover, experimental attempts to realize a unitary Bose gas of atoms did not succeed. This is due to coalescence of three and more atoms (few-body recombination) [12,13] and mechanical instability when approaching the resonance on the attractive side [14].In this Letter we propose a new setting for study and manipulation of resonantly paired bosonic superfluids. Bosonic quasiparticles we consider are indirect excitons in biased semiconductor heterostructures. Our excitonic analog of BCS is expected to be stable across the whole range of scattering lengths. The scattering length of the excitons can be conveniently tuned by the bias electric field. A distinct feature of an indirect exciton is a large dipole moment oriented perpendicularly to the structure plane. In the system under consideration an interplay between the long-range dipolar repulsion and the resonant interaction may result in formation of a fragmented biexcitonic supersolid. This new strongly correlated state of bosonic matter would be robust to fluctuations of all kind which usually spoil superconductivity in low dimensions. In transitio...

show abstract

Two-dimensional dipolar Bose gas with the roton-maxon excitation spectrum

Cited by 64 publications

References 44 publications

Quantum dilute droplets of dipolar bosons at finite temperature

Quantum dilute droplets of dipolar bosons at finite temperature

Stable Dilute Supersolid of Two-Dimensional Dipolar Bosons

Resonant pairing of excitons in semiconductor heterostructures

Contact Info

Product

Resources

About