• Open Access

Spin-induced orbital frustration in a hexagonal optical lattice

Yongqiang Li, Jianmin Yuan, Xiaoji Zhou, and Xiaopeng Li
Phys. Rev. Research 3, 033274 – Published 23 September 2021

Abstract

Complex lattices provide a versatile ground for fascinating quantum many-body physics. Here, we propose an exotic mechanics for generating orbital frustration in hexagonal lattices. We study two-component (pseudospin-12) Bose gases in p-orbital bands of two-dimensional hexagonal lattices, and find that the system exhibits previously untouched orbital frustration as a result of the interplay of spin and orbital degrees of freedom, in contrast to normal Ising-type orbital ordering of spinless p-orbital band bosons in two-dimensional hexagonal lattices. Based on the classification by symmetry analysis, we find the interplay of orbital frustration and strong interaction leads to exotic Mott and superfluid phases with spin-orbital intertwined orders, in spite of the complete absence of spin-orbital interaction in the Hamiltonian. Our study implies many-body correlations in a multiorbital setting could induce rich spin-orbital intertwined physics in complex lattice structures.

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  • Received 15 January 2021
  • Revised 25 June 2021
  • Accepted 8 September 2021

DOI:https://doi.org/10.1103/PhysRevResearch.3.033274

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Yongqiang Li1,2,*, Jianmin Yuan2,1, Xiaoji Zhou3, and Xiaopeng Li4,5,†

  • 1Department of Physics, National University of Defense Technology, Changsha 410073, People's Republic of China
  • 2Department of Physics, Graduate School of China Academy of Engineering Physics, Beijing 100193, People's Republic of China
  • 3State Key Laboratory of Advanced Optical Communication System and Network, Department of Electronics, Peking University, Beijing 100871, People's Republic of China
  • 4State Key Laboratory of Surface Physics, Institute of Nanoelectronics and Quantum Computing, and Department of Physics, Fudan University, Shanghai 200438, People's Republic of China
  • 5Shanghai Qi Zhi Institute, AI Tower, Xuhui District, Shanghai 200232, People's Republic of China

  • *li_yq@nudt.edu.cn
  • xiaopeng_li@fudan.edu.cn

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Vol. 3, Iss. 3 — September - November 2021

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