Beyond-mean-field study of a binary bosonic mixture in a state-dependent honeycomb lattice

Cao, Lushuai; Krönke, Sven; Stockhofe, J.; Simonet, Juliette; Sengstock, K.; Lühmann, Dirk-Sören; Schmelcher, Peter

doi:10.1103/physreva.91.043639

Cited by 11 publications

(15 citation statements)

References 50 publications

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“…The origin of this unconventional superfluid phase lacks a conclusive theoretical understanding. In fact, previous theoretical studies 4 5 have found no indication for a transition to the twisted superfluid phase. Here, we show that correlated pair tunneling can drive the quantum phase transition to the twisted superfluid ground state.…”

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confidence: 84%

Twisted complex superfluids in optical lattices

Jürgensen

Sengstock

Lühmann

2015

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We show that correlated pair tunneling drives a phase transition to a twisted superfluid with a complex order parameter. This unconventional superfluid phase spontaneously breaks the time-reversal symmetry and is characterized by a twisting of the complex phase angle between adjacent lattice sites. We discuss the entire phase diagram of the extended Bose—Hubbard model for a honeycomb optical lattice showing a multitude of quantum phases including twisted superfluids, pair superfluids, supersolids and twisted supersolids. Furthermore, we show that the nearest-neighbor interactions lead to a spontaneous breaking of the inversion symmetry of the lattice and give rise to dimerized density-wave insulators, where particles are delocalized on dimers. For two components, we find twisted superfluid phases with strong correlations between the species already for surprisingly small pair-tunneling amplitudes. Interestingly, this ground state shows an infinite degeneracy ranging continuously from a supersolid to a twisted superfluid.

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confidence: 84%

Twisted complex superfluids in optical lattices

Jürgensen

Sengstock

Lühmann

2015

Sci Rep

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“…For being concrete, we consider a model with atoms in continuous space (treating discrete lattice systems is straightforward, see e.g. [74,75]), where the single-particle Hamiltonian typically readŝ…”

Section: A Physical Systemsmentioning

confidence: 99%

A unified ab initio approach to the correlated quantum dynamics of ultracold fermionic and bosonic mixtures

Cao

Bolsinger

Mistakidis

et al. 2017

The Journal of Chemical Physics

117

203

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We extent the recently developed Multi-Layer Multi-Configuration Time-Dependent Hartree method for Bosons (ML-MCTDHB) for simulating the correlated quantum dynamics of bosonic mixtures to the fermionic sector and establish a unifying approach for the investigation of the correlated quantum dynamics of mixture of indistinguishable particles, be it fermions or bosons.Relying on a multi-layer wave-function expansion, the resulting Multi-Layer Multi-Configuration Time-Dependent Hartree method for Mixtures (ML-MCTDHX) can be adapted to efficiently resolve system-specific intra-and inter-species correlations. The versatility and efficiency of ML-MCTDHX is demonstrated by applying it to the problem of colliding few-atom mixtures of both Bose-Fermi and Fermi-Fermi type. Thereby, we elucidate the role of correlations in the transmission and reflection properties of the collisional events. In particular, we present examples where the reflection (transmission) at the other atomic species is a correlation-dominated effect, i.e. it is suppressed in the mean-field approximation.

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“…The emergence of this twisted superfluid phase was first attributed to pair processes in an effective singlecomponent mean-field picture [19]. Subsequent theoret- ical two-component studies have found only real-valued superfluids, but either discard correlations [25] or are restricted to the standard Bose-Hubbard model dismissing pair-tunneling [26]. In Ref.…”

Section: Twisted Superfluid Phasementioning

confidence: 99%

Symmetry-broken momentum distributions induced by matter-wave diffraction during time-of-flight expansion of ultracold atoms

et al. 2016

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We study several effects which lead to symmetry-broken momentum distributions of quantum gases released from optical lattices. In particular, we demonstrate that interaction within the first milliseconds of the time-of-flight expansion can strongly alter the measurement of the initial atomic momentum distribution. For bosonic mixtures in state-dependent lattices, inter-species scattering processes lead to a symmetry breaking in momentum space. The underlying mechanism is identified to be diffraction of the matter wave from the total density lattice, which gives rise to a timedependent interaction potential. Our findings are of fundamental relevance for the interpretation of time-of-flight measurements and for the study of exotic quantum phases such as the twisted superfluid. Beyond that, the observed matter-wave diffraction can also be used as an interferometric probe. In addition, we report on diffraction from the state-dependent standing light field, which leads to the same symmetry-broken momentum distributions, even for single component condensates.

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Beyond-mean-field study of a binary bosonic mixture in a state-dependent honeycomb lattice

Cited by 11 publications

References 50 publications

Twisted complex superfluids in optical lattices

Twisted complex superfluids in optical lattices

A unified ab initio approach to the correlated quantum dynamics of ultracold fermionic and bosonic mixtures

Symmetry-broken momentum distributions induced by matter-wave diffraction during time-of-flight expansion of ultracold atoms

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