Nonclassical states in strongly correlated bosonic ring ladders

Nicolas Victorin, Tobias Haug, Leong-Chuan Kwek, Luigi Amico, and Anna Minguzzi
Phys. Rev. A 99, 033616 – Published 21 March 2019

Abstract

We study the ground state of a bosonic ring ladder under a gauge flux in the vortex phase, corresponding to the case where the single-particle dispersion relation has two degenerate minima. By combining exact diagonalization and an approximate fermionization approach we show that the ground state of the system evolves from a fragmented state of two single-particle states at weak interparticle interactions to a fragmented state of two Fermi seas at large interactions. Fragmentation is inferred from the study of the eigenvalues of the reduced single-particle density matrix as well as from the calculation of the fidelity of the states. We characterize these nonclassical states by the momentum distribution, the chiral currents, and the current-current correlations.

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  • Received 10 October 2018

DOI:https://doi.org/10.1103/PhysRevA.99.033616

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Nicolas Victorin1, Tobias Haug2, Leong-Chuan Kwek2,3,4,5, Luigi Amico2,3,6,7,8, and Anna Minguzzi1

  • 1Univ. Grenoble Alpes, CNRS, LPMMC, F-38000 Grenoble, France
  • 2Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543
  • 3MajuLab, CNRS-UNS-NUS-NTU International Joint Research Unit, UMI 3654, Singapore UMI 3654
  • 4Institute of Advanced Studies, Nanyang Technological University, 60 Nanyang View, Singapore 639673
  • 5National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616
  • 6Dipartimento di Fisica e Astronomia, Via S. Sofia 64, 95127 Catania, Italy
  • 7CNR-MATIS-IMM & INFN-Sezione di Catania, Via S. Sofia 64, 95127 Catania, Italy
  • 8LANEF ‘Chaire d'excellence’, Université Grenoble-Alpes & CNRS, F-38000 Grenoble, France

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Issue

Vol. 99, Iss. 3 — March 2019

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