Manipulating novel quantum phenomena using synthetic gauge fields

Zhang, Shaoliang; Zhou, Qi

doi:10.1088/1361-6455/aa8c5a

Cited by 18 publications

(12 citation statements)

References 137 publications

(192 reference statements)

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“…The topological phase transition line, which separates states with a Chern number of 2 from those with a vanishing Chern number, is highlighted with a black curve. Figure (B) was first published in [1].…”

Section: Orcid Idsmentioning

confidence: 99%

Erratum: Manipulating novel quantum phenomena using synthetic gauge fields (2017 J. Phys. B: At. Mol. Opt. Phys. 50 222001)

Zhang

Zhou

2018

J. Phys. B: At. Mol. Opt. Phys.

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Section: Orcid Idsmentioning

confidence: 99%

Erratum: Manipulating novel quantum phenomena using synthetic gauge fields (2017 J. Phys. B: At. Mol. Opt. Phys. 50 222001)

Zhang

Zhou

2018

J. Phys. B: At. Mol. Opt. Phys.

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“…Engineering synthetic gauge fields and observing their physical effects in ultracold atomic gases have been a subject of great interest in recent years [1,2,3,4]. While atomic gases are charge neutral, effective gauge fields can be induced by rotating gases [5,6] or optically dressing atoms [7].…”

Section: Introductionmentioning

confidence: 99%

Vortex lattices in binary Bose-Einstein condensates: Collective modes, quantum fluctuations, and intercomponent entanglement

Yoshino,

Furukawa,

Ueda

2021

Preprint

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We study binary Bose-Einstein condensates subject to synthetic magnetic fields in mutually parallel or antiparallel directions. Within the mean-field theory, the two types of fields have been shown to give the same vortex-lattice phase diagram. We develop an improved effective field theory to study properties of collective modes and ground-state intercomponent entanglement. Here, we point out the importance of introducing renormalized coupling constants for coarse-grained densities. We show that the low-energy excitation spectra for the two types of fields are related to each other by suitable rescaling using the renormalized constants. By calculating the entanglement entropy, we find that for an intercomponent repulsion (attraction), the two components are more strongly entangled in the case of parallel (antiparallel) fields, in qualitative agreement with recent studies for a quantum (spin) Hall regime. We also find that the entanglement spectrum exhibits an anomalous square-root dispersion relation, which leads to a subleading logarithmic term in the entanglement entropy. All of these are confirmed by numerical calculations based on the Bogoliubov theory with the lowest-Landau-level approximation. Finally, we investigate the effects of quantum fluctuations on the phase diagrams by calculating the correction to the ground-state energy due to zero-point fluctuations in the Bogoliubov theory. We find that the boundaries between rhombic-, square-, and rectangular-lattice phases shift appreciably with a decrease in the filling factor.

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“…The model of Iemini et al has a basis that is composed of four hyperfine states of a fermionic alkaline earth-like atom [9], physically labeled according to an orbital angular momentum quantum number (labeled p = ±) and pseudo-spin (labeled α =↑, ↓), with couplings between two effective nuclear spin states and two orbital spin states provided by interactions with the photon field of the optical lattice as well as two-body interactions between the atoms [10][11][12]. The Iemini Hamiltonian is constructed from a sum of a nearest-neighbor tunneling, onsite potential, synthetic spin-orbit coupling, and a two-body spin-exchange interaction:…”

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Observability of a Sharp Majorana Transition in a Few-Body Model

Bland,

Greene,

Wehefritz-Kaufmann

2020

Preprint

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We propose experimentally observable signatures for the appearance of topological Majorana quasiparticles in the few-body limit the interacting cold-atom model of [Iemini et al. Phys. Rev. Lett. 118 200404 (2017)]. In this limit, density and single-body correlations change smoothly with the model parameters. On the other hand, the calculated mutual information of opposite ends of the lattice does show a sharp transition to a non-local ground state. Furthermore, local density and parity measurements provide an experimentally viable path for observing the ground state Majorana quasiparticles in ultracold atoms. Our results lay out a promising future for utilizing few-body systems as a testing ground for Majorana physics.

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Manipulating novel quantum phenomena using synthetic gauge fields

Abstract: There is an error in the published version of the paper [1]. The figure 13(B) has been missed. This error does not affect the scientific outcome of the paper.

Cited by 18 publications

References 137 publications

Erratum: Manipulating novel quantum phenomena using synthetic gauge fields (2017 J. Phys. B: At. Mol. Opt. Phys. 50 222001)

Erratum: Manipulating novel quantum phenomena using synthetic gauge fields (2017 J. Phys. B: At. Mol. Opt. Phys. 50 222001)

Vortex lattices in binary Bose-Einstein condensates: Collective modes, quantum fluctuations, and intercomponent entanglement

Observability of a Sharp Majorana Transition in a Few-Body Model

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