Controlling the interaction of ultracold alkaline-earth atoms

Abstract

Ultracold alkaline-earth atoms have now been widely explored for precision measurements and quantum simulation. Because of its unique atomic structure, alkaline earth atoms possess great advantages for quantum simulation and studying quantum many-body matters, such as simulating synthetic gauge field, Kondo physics and SU (N ) physics. To fully explore the potential of ultracold alkaline-earth atoms, these systems also need to be equipped with the capability of tuning the interatomic interaction to the strongly interacting regime. Recently several theoretical proposals and experimental demonstrations have shown that both spin-independent and spin-exchanging interaction can be tuned to resonance. In this perspective, we will review these progress and discuss the new opportunities brought by these interaction control tools for future quantum simulation studies with ultracold alkaline-earth atoms. arXiv:1908.04973v1 [cond-mat.quant-gas]

Kondo effect in a non-Hermitian, $\mathcal{PT}$-symmetric Anderson model with Rashba spin-orbit coupling

“…The observations of gain and loss due to depletion of atoms have been attributed to the phenomenon of continuous quantum Zeno effect [13][14][15][16] . Conventional Kondo type systems such as impurities coupled to baths have been realised in controlled environments like atoms in harmonic traps [17][18][19][20][21][22] , where the small number of excited states mimic magnetic impu-rities and the atoms in the ground state provide the bath. In experiments where Rashba type spin-obit coupling is generated synthetically, induced artificial magnetic fields break parity and time reversal symmetries.…”

Heuristic machinery for thermodynamic studies of SU(N) fermions with neural networks

“…In quantum chromodynamics, nuclear interactions are represented by SU(3) symmetry 3 , 4 . In the past decades, developments in cooling and trapping of alkaline-earth-like fermions 5 have opened possibilities to achieve even higher spin symmetries, owing to their distinctive inter-particle interactions, and thus provided ideal platforms to study various SU( N ) fermionic systems 1 , 6 , 7 . Although the role of SU( N ) symmetry has been probed in optical lattices 8 – 15 , the comprehensive characterization of interacting SU( N ) fermions in bulk, wherein the SU( N ) Fermi liquid description is valid, has still remained challenging 16 – 19 .…”

Universal energy-dependent pseudopotential for the two-body problem of confined ultracold atoms

“…As a result, there are nuclear-spin exchange interactions between these two atoms, with the intensity being proportional to (a − − a + ) in the zero-range limit [13,16,17,19,22]. Thus, the mixture of ultracold atoms in 1 S 0 and 3 P 0 states is a promising candidate for the quantum simulation of many-body physics induced by spin-exchange interaction (e.g., the Kondo physics), and has attracted much attention [6,7,9,17,22,[27][28][29][30][31]. Furthermore, the precise values of a ± are required as basic parameters for the study of this quantum simulation.…”