Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms

Ravensbergen, Cornelis; Corre, Vincent; Soave, Elisa; Kreyer, Marian; Kirilov, Emil; Grimm, Rudolf

doi:10.1103/physreva.98.063624

Cited by 72 publications

(70 citation statements)

References 99 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The recently realized Fermi mixtures involving large mass imbalance constitute candidates for an experimental realization of the situation analyzed in the present paper. One promising candidate is the mixture of 161 Dy and 40 K atoms [17,18], which, due to the existence of a broad Feshbach resonance [86], can be tuned more flexibly than the earlier studied mixtures of 6 Li and 40 K atoms [13][14][15][16].…”

Section: Discussionmentioning

confidence: 99%

“…In Fig. 2 we plot Z for the experimentally realized mixture of 161 Dy and 40 K atoms [17,18], which is characterized by r = 4.03 and μ = 0.1. We adapt the value of h c [see Eq.…”

Section: A Gradient Expansion and The Quantum Lifshitz Pointmentioning

confidence: 99%

“…A standard example is the BEC-BCS crossover [8,9], experimentally realized by resonantly controlled s-wave interaction strength between particles in different pseudospin states. In Fermi mixtures, the possibility of tuning the population [10][11][12] and mass imbalance [13][14][15][16][17][18][19][20] allows for studying unconventional pairing phenomena leading to unusual superfluid phases such as the breached-pair (Sarma-Liu-Wilczek) superfluids [21,22] or the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases [23,24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures

Zdybel

Jakubczyk

2020

Phys. Rev. Research

View full text Add to dashboard Cite

We perform a detailed analysis of the phase transition between the uniform superfluid and normal phases in spin-and mass-imbalanced Fermi mixtures. At mean-field level we demonstrate that at temperature T → 0 the gradient term in the effective action can be tuned to zero for experimentally relevant sets of parameters, thus providing an avenue to realize a quantum Lifshitz point. We subsequently analyze damping processes affecting the order-parameter field across the phase transition. We show that in the low-energy limit, Landau damping occurs only in the symmetry-broken phase and affects exclusively the longitudinal component of the order-parameter field. It is however unavoidably present in the immediate vicinity of the phase transition at temperature T = 0. We subsequently perform a renormalization group analysis of the system in a situation, where, at mean-field level, the quantum phase transition is second order (and not multicritical). We find that, at T sufficiently low, including the Landau-damping term in a form derived from the microscopic action destabilizes the renormalization group flow toward the Wilson-Fisher fixed point. This signals a possible tendency to drive the transition weakly first order by the coupling between the order-parameter fluctuations and fermionic excitations effectively captured by the Landau-damping contribution to the order-parameter action.

show abstract

Section: Discussionmentioning

confidence: 99%

“…In Fig. 2 we plot Z for the experimentally realized mixture of 161 Dy and 40 K atoms [17,18], which is characterized by r = 4.03 and μ = 0.1. We adapt the value of h c [see Eq.…”

Section: A Gradient Expansion and The Quantum Lifshitz Pointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures

Zdybel

Jakubczyk

2020

Phys. Rev. Research

View full text Add to dashboard Cite

show abstract

“…In this way, we want to draw a much closer analogy between critical transitions in systems containing a finite number of particles (but having infinitely many configurations accessible) with standard quantum phase transitions occurring in systems of infinite sizes. Since fewfermion systems of equal mass atoms has been engineered almost for a decade [23][24][25] and there are experimental setups where mass-imbalanced fermionic mix-tures with a large number of particles are realized [26][27][28][29][30], we believe that the path of exploration proposed here may be important when the next generation of experiments of mass-imbalanced few-fermion mixtures will be performed [31,32].…”

Section: Introductionmentioning

confidence: 99%

Geometry-induced entanglement in a mass-imbalanced few-fermion system

2020

View full text Add to dashboard Cite

Many-body systems undergoing quantum phase transitions reveal substantial growth of non-classical correlations between different parties of the system. This behavior is manifested by characteristic divergences of the von Neumann entropy. Here we show, that very similar features may be observed in one-dimensional systems of a few strongly interacting atoms when the structural transitions between different spatial orderings are driven by a varying shape of an external potential. When the appropriate adaptation of the finite-size scaling approach is performed in the vicinity of the transition point, fewfermion systems display a characteristic power-law invariance of divergent quantities. arXiv:1909.08949v2 [cond-mat.quant-gas]

show abstract

“…Not only does this have significant consequences for the superfluid properties [17], but also for the screening responses of the electrons and holes, which are significantly different from the equal mass case. In ultracold atomic gases, Dy-K Fermi mixtures have been used to explore the physics of mass-imbalanced strongly interacting Fermi-Fermi mixtures [18].…”

mentioning

confidence: 99%

Experimental conditions for the observation of electron-hole superfluidity in GaAs heterostructures

et al. 2020

View full text Add to dashboard Cite

The experimental parameter ranges needed to generate superfluidity in optical and drag experiments in GaAs double quantum wells are determined, using a formalism that includes self-consistent screening of the Coulomb pairing interaction in the presence of the superfluid. The very different electron and hole masses in GaAs make this a particularly interesting system for superfluidity, with exotic superfluid phases predicted in the BCS-BEC crossover regime. We find that the density and temperature ranges for superfluidity cover the range for which optical experiments have observed indications of superfluidity, but that existing drag experiments lie outside the superfluid range. However we also show that for samples with low mobility with no macroscopically connected superfluidity, if the superfluidity survived in randomly distributed localized pockets, standard quantum capacitance measurements could detect these pockets.While Bose Einstein Condensation (BEC) and the BCS-BEC crossover phenomena in superfluidity have been extensively studied for ultracold Fermi atoms[1-3], it is probable that practical applications will instead be based on superfluidity in solid state devices. Existence of superfluidity in coupled atomically-flat layers in semiconductor heterostructures has been theoretically predicted [4,5], while recent observations of dramatically enhanced tunneling at equal densities in electron-hole double bilayer sheets of graphene [6,7] and in double monolayers of transition metal dichalcogenide monolayers [8,9] are strong experimental indications for electron-hole condensation [10].Electron-hole superfluidity and the BCS-BEC crossover was first proposed for an excitonic system in a conventional semiconductor heterostructure of double quantum-wells in GaAs[11]. This was based on extensions of earlier work on exciton condensation [12][13][14][15]. To block electron-hole recombination, Refs. 14, 15 proposed spatially separating the electrons and holes in a heterostructure consisting of two layers separated by an insulating barrier. Superfluidity in GaAs quantum-wells differs in significant ways from superfluidity in coupled atomically-flat layers. The large band gap in GaAs eliminates the multicondensate effects and multiband screening that are important in graphene [16], and the low-lying conduction and valence bands are nearly parabolic, and not dependent on gate potentials. arXiv:1910.06631v1 [cond-mat.supr-con]

show abstract

Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms

Cited by 72 publications

References 99 publications

Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures

Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures

Geometry-induced entanglement in a mass-imbalanced few-fermion system

Experimental conditions for the observation of electron-hole superfluidity in GaAs heterostructures

Contact Info

Product

Resources

About