Harnessing currents of particles for spectroscopy in small-ring lattices with binary mixtures

Morales-Molina, Luis; Reyes, Sebastian; Arévalo, E.

doi:10.1209/0295-5075/131/36001

Cited by 3 publications

(2 citation statements)

References 56 publications

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“…Notice that the interaction term ∝ U, as well as the single-particle-potential term ∝ µ are left unchanged by the Peierls substitution. The ground state |ψ 0 of the resulting Hamiltonian, H , is characterized in terms of the expectation value of the particle current operator [71,72]…”

Section: Interaction-resilient Metallicitymentioning

confidence: 99%

Mimicking Multiorbital Systems with SU(N) Atoms: Hund’s Physics and Beyond

2022

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The physics of many interesting correlated materials can be captured by multiorbital Hubbard models, where conduction electrons feature an additional orbital degree of freedom. The multiorbital characteristic is not a mere complication, but it leads to an immensely richer landscape of physical regimes. One of the key features is the interplay between Hubbard repulsion and Hund’s exchange coupling, which has been shown to lead to orbital-selective correlations and to the existence of correlation-resilient metals (usually called Hund’s metals) defying Mott localization. Here, we show that experimentally available platforms of SU(N)-symmetric ultracold atoms can indeed mimic the rich physics disclosed by multiorbital materials, by exploiting the internal degrees of freedom of multicomponent atoms. We discuss in detail the SU(N) version of interaction-resilient Hund’s metal and some other interesting regimes.

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Section: Interaction-resilient Metallicitymentioning

confidence: 99%

Mimicking Multiorbital Systems with SU(N) Atoms: Hund’s Physics and Beyond

2022

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“…In particular, extensive research has been carried out in small systems of two wells [40][41][42][43][44][45][46][47][48][49][50][51][52] and three-well rings [36,53]. Very importantly, the tuning of the interaction strength between atoms of distinct species, which is an accessible experimental parameter [54,55], has been suggested as a tool of control of quantum systems [35,[56][57][58][59].…”

Section: Introductionmentioning

confidence: 99%

One-BEC-species coherent oscillations with frequency controlled by a second species atom number

Morales-Molina

Arévalo

2022

New J. Phys.

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Controlling the tunneling of atoms of one species using a different atom species is a fundamental step in the development of a new class of atom quantum devices, where detection, motion control, and other functions over the atoms, can be achieved by exploiting the interaction between two different atomic species. Here, we theoretically study coherent oscillations of a non-self-interacting Bose-Einstein condensate (BEC) species in a triple-well potential controlled by a self-interacting species self-trapped in the central well of the potential. In this system, a blockade, due to the interspecies interaction, prevents atoms of the non-self-interacting species from populating the central well. Thus, for an initial population imbalance between the left- and right-hand wells of the non-self-interacting species, coherent BEC oscillations are induced between these two wells, resembling those of Rabi-like BEC oscillations in a double-well potential. The oscillation period is found to scale linearly with the number of self-trapped atoms as well as with the interspecies interaction strength. This behavior is corroborated by the quantum many-particle and the mean-field models of the system. We show that BEC oscillations can be described by using an effective bosonic Josephson junction with a tunneling amplitude that depends on the number of the self-trapped atoms in the central well. We also consider the effect of the self-trapped atom losses on the coherent oscillations. We show, by using quantum trajectories, that this type of losses leads to a dynamical change in the oscillation period of the non-self-interacting species, which in turn allows the number of self-trapped atoms lost from the system to be estimated.

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Persistent currents in Bose–Bose mixtures after an interspecies interaction quench

2021

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We study the persistent currents and interspecies entanglement generation in a Bose–Bose mixture formed by two atomic gases (hereafter labeled by the letters A and B) trapped in a one-dimensional ring lattice potential with an artificial gauge field after a sudden quench from zero to strong interactions between the two gases. Assuming that the strength of these interactions is much larger than the single species energies and that the gas A is initially in the Mott-insulator regime, we show that the current of the gas B is reduced with respect to its value prior the interaction quench. Averaging fast oscillations out, the relative decrease of this current is independent of the initial visibility and Peierls phase of the gas B and behaves quadratically with the visibility of the gas A. The second Rényi entropy of the reduced state measuring the amount of entanglement between the two gases is found to scale linearly with the number of sites and to be proportional to the relative decrease of the current.

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Harnessing currents of particles for spectroscopy in small-ring lattices with binary mixtures

Cited by 3 publications

References 56 publications

Mimicking Multiorbital Systems with SU(N) Atoms: Hund’s Physics and Beyond

Mimicking Multiorbital Systems with SU(N) Atoms: Hund’s Physics and Beyond

One-BEC-species coherent oscillations with frequency controlled by a second species atom number

Persistent currents in Bose–Bose mixtures after an interspecies interaction quench

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