Rotation-symmetry-enforced coupling of spin and angular momentum for p-orbital bosons

Abstract

Intrinsic spin angular-momentum coupling of an electron has a relativistic quantum origin with the coupling arising from charged-orbits, which does not carry over to charge-neutral atoms. Here we propose a mechanism of spontaneous generation of spin angular-momentum coupling with spinor atomic bosons loaded into $p$-orbital bands of a two-dimensional optical-lattice. This spin angular-momentum coupling originates from many-body correlations and spontaneous symmetry breaking in a superfluid, with the key ingredients attributed to spin-channel quantum fluctuations and an approximate rotation symmetry. The resultant spin angular-momentum intertwined superfluid has Dirac excitations. In presence of a chemical potential difference for adjacent sites, it provides a bosonic analogue of a symmetry-protected-topological insulator. Through a dynamical mean-field calculation, this novel superfluid is found to be a generic low-temperature phase, and it gives way to Mott localization only at strong interactions and even-integer fillings. We show the temperature to reach this order is accessible with present experiments.

7 pages, 4 figures, 1 table, with supplementary material

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Cited by in corpus (9)

• Chiral Induced Spin Selectivity as a Spontaneous Intertwined Order
• Nonlinear dynamics of Rydberg-dressed Bose-Einstein condensates in a triple-well potential
• Quantum phases of spin-orbital-angular-momentum coupled bosonic gases in optical lattices
• Experimental realization of a high precision tunable hexagonal optical lattice
• Spin-Induced Orbital Frustration in a Hexagonal Optical Lattice
• Controlling higher-orbital quantum phases of ultracold atoms via coupling to optical cavities
• Topological phases of spinless $p$-orbital fermions in zigzag optical lattices
• Magnetisms of spinor alkali and alkaline-earth atoms in optical lattices
• Orbital Optical Raman Lattice