Frustrated Bose-Einstein condensates with non-collinear orbital ordering
Zi Cai, Yu Wang, and Congjun Wu
TL;DR
This paper explores unconventional Bose-Einstein condensates with orbital degrees of freedom in a 3D lattice, revealing spontaneous time-reversal symmetry breaking, orbital frustration, and chiral ordering driven by quantum fluctuations.
Contribution
It introduces a new class of orbital BECs exhibiting exotic properties like orbital frustration and chiral order, expanding understanding of quantum many-body systems.
Findings
Orbital angular momentum moments form on lattice sites.
Time-reversal symmetry is spontaneously broken.
Chiral ordering is stabilized by the 'order-from-disorder' mechanism.
Abstract
We investigate the unconventional Bose-Einstein condensations (BEC) with the orbital degree of freedom in the 3D cubic optical lattice, which give rise to various exotic features absent in conventional scalar and spinor BECs. Orbital angular momentum moments are formed on lattice sites breaking time-reversal symmetry spontaneously. Furthermore, they exhibit orbital frustrations and develop a chiral ordering selected by the "order-from-disorder" mechanism.
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