Transport and interaction blockade of cold bosonic atoms in a triple-well potential

Schlagheck, Peter; Malet, Francesc; Cremon, Jonas; Reimann, S. M.

doi:10.1088/1367-2630/12/6/065020

Cited by 26 publications

(36 citation statements)

References 36 publications

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“…In [26], such an effect is also seen and successfully exploited to achieve the population transfer sought for. Let us choose a velocity α for the change of ε(t) = αt in time that allows to pass the single-particle resonances adiabatically.…”

Section: Landau-zener Dynamicsmentioning

confidence: 99%

Effects of a single fermion in a Bose Josephson junction

Rinck

Bruder

2011

Phys. Rev. A

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We consider the tunneling properties of a single fermionic impurity immersed in a Bose-Einstein condensate in a double-well potential. For strong boson-fermion interaction, we show the existence of a tunnel resonance where a large number of bosons and the fermion tunnel simultaneously. We give analytical expressions for the line shape of the resonance using degenerate Brillouin-Wigner theory. We finally compute the time-dependent dynamics of the mixture. Using the fermionic tunnel resonances as a beam splitter for wave functions, we construct a Mach-Zehnder interferometer that allows complete population transfer from one well to the other by tilting the double-well potential and only taking into account the fermion's tunnel properties.

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Section: Landau-zener Dynamicsmentioning

confidence: 99%

Effects of a single fermion in a Bose Josephson junction

Rinck

Bruder

2011

Phys. Rev. A

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“…We consider atoms that are initially prepared in a certain region of a double-well optical lattice [24][25][26][27][28][29][30][31][32][33][34]. We show that a quantized number of atoms can be transferred to another region of the lattice through periodic and slow modulation of the optical lattice parameters (intra-and inter-well tunneling, chemical potential, etc.).…”

Section: Introductionmentioning

confidence: 99%

Quantum transport of bosonic cold atoms in double-well optical lattices

2011

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We numerically investigate, using the time evolving block decimation algorithm, the quantum transport of ultracold bosonic atoms in a double-well optical lattice through slow and periodic modulation of the lattice parameters (intra-and inter-well tunneling, chemical potential, etc.). The transport of atoms does not depend on the rate of change of the parameters (as along as the change is slow) and can distribute atoms in optical lattices at the quantized level without involving external forces. The transport of atoms depends on the atom filling in each double well and the interaction between atoms. In the strongly interacting region, the bosonic atoms share the same transport properties as noninteracting fermions with quantized transport at the half filling and no atom transport at the integer filling. In the weakly interacting region, the number of the transported atoms is proportional to the atom filling. We show the signature of the quantum transport from the momentum distribution of atoms that can be measured in the time-of-flight image. A semiclassical transport model is developed to explain the numerically observed transport of bosonic atoms in the noninteracting and strongly interacting limits. The scheme may serve as an quantized battery for atomtronics applications.

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“…Both findings together verify the predicted dependence: τ −1 eff ∝ J 2 =Γ dec . Conclusions.-The observation of NDC in the transport of ultracold quantum gases bears great potential for future implementations of interaction controlled atomic circuits [14,15,[36][37][38][39]. It can also serve as an alternative mechanism for the observation of bistability and related nonequilibrium phenomena.…”

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confidence: 99%

Negative Differential Conductivity in an Interacting Quantum Gas

et al. 2015

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We report on the observation of negative differential conductivity (NDC) in a quantum transport device for neutral atoms employing a multimode tunneling junction. The system is realized with a Bose-Einstein condensate loaded in a one-dimensional optical lattice with high site occupancy. We induce an initial difference in chemical potential at one site by local atom removal. The ensuing transport dynamics are governed by the interplay between the tunneling coupling, the interaction energy, and intrinsic collisions, which turn the coherent coupling into a hopping process. The resulting current-voltage characteristics exhibit NDC, for which we identify atom number-dependent tunneling as a new microscopic mechanism. Our study opens new ways for the future implementation and control of complex neutral atom quantum circuits.

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Transport and interaction blockade of cold bosonic atoms in a triple-well potential

Cited by 26 publications

References 36 publications

Effects of a single fermion in a Bose Josephson junction

Effects of a single fermion in a Bose Josephson junction

Quantum transport of bosonic cold atoms in double-well optical lattices

Negative Differential Conductivity in an Interacting Quantum Gas

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