Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session D06: Ultracold fermions with SU(N) symmetry in optical latticesInvited Live
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Sponsoring Units: DCMP Chair: Kaden Hazzard, Rice University Room: E141-142 |
Tuesday, June 2, 2020 2:00PM - 2:30PM Live |
D06.00001: The SU(N) Heisenberg model: from the Haldane conjecture to chiral phases Invited Speaker: Frederic Mila The possibility to realize Mott phases with ultra-cold fermions in optical lattices has motivated the community to revisit the properties of the SU(N) cousin of the celebrated SU(2) Heisenberg model of quantum magnetism. In this talk, I will try to give an overview of the recent progress made on this model, with emphasis on two aspects: the generalisation of the Haldane conjecture in 1D, and the possibility to stabilize chiral quantum liquid phases in realistic models. [Preview Abstract] |
Tuesday, June 2, 2020 2:30PM - 3:00PM Live |
D06.00002: Quantum magnetism of SU(6) fermions in an optical lattice Invited Speaker: Yoshiro Takahashi Ultracold fermions with an enlarged spin symmetry of SU(N) in an optical lattice offer novel possibilities of quantum simulation. Recent theories for an SU(N) Hubbard model predict novel quantum magnetisms, which is conceptually important from the viewpoints of deeper understanding of a strongly correlated quantum many-body system. At the same time, the SU(N) Hubbard model is a computationally difficult problem due to a large number of spin-components. In this paper, by working with ultracold two-electron atoms of ytterbium, we study an SU(N$=$6) Fermi Hubbard model. By developing an all-optical means of singlet-triplet oscillation (STO) we successfully detect nearest-neighbor spin correlations in various lattice geometries. This enlarged spin symmetry of SU(N) is also a powerful tool to lower the temperature of atoms in an optical lattice, known as a Pomeranchuk cooling effect, confirmed by our antiferromagnetic spin correlation measurements. We extend our study of the SU(N) Hubbard model to a plaquette lattice configuration which has a novel four-body entangled state of SU(4)-singlet as the ground state. Our STO measurements for the SU(6) fermions show the realization of this SU(4)-singlet state. Furthermore, we study the quantum magnetism in an open dissipative system where a controlled two-body dissipation is introduced to the Fermi Hubbard system. The STO signals show the sign-reversal, which indicates the dynamical change from the antiferromagnetic spin correlation in the absence of the dissipation to the ferromagnetic spin correlation in the presence of the dissipation, realizing the negative-temperature quantum magnetism. [Preview Abstract] |
Tuesday, June 2, 2020 3:00PM - 3:30PM Not Participating |
D06.00003: Free Fermi gas dynamics with orbital interactions in ultracold Yb Invited Speaker: Simon Fölling Ultracold atoms of alkaline-earth-(like) atoms provide quantum gases with particular features stemming from the two-electron structure of the atoms. Most notable are the existence of a very weakly coupled nuclear spin in the fermionic isotopes and the existence of long-lived metastable states among the spin triplet states. The former realizes a very well decoupled internal degree of freedom, allowing for the realization of SU(N)-symmetric quantum gases with a spin larger than 1/2, which allows for novel magnetic states and well-protected spin state preparation. The latter provide additional electronic degrees of freedom which can be used as an orbital degree of freedom for the many-body system. We realize degenerate quantum gases of fermionic ytterbium in optical lattice potentials, using the metastable $^3P_0$ state as an orbital state both to control the interactions between particles and their state-dependent mobility. The ytterbium 171 isotope in particular allows for the creation of non-interacting Fermi gases interacting with a second orbital via both a contact and an antiferromagnetic spin-exchange interaction term. The interactions are governed by a strongly bound dimer state, which we characterize with direct free-to-bound clock-line photoassociation in a magic lattice. Using a state-dependent lattice, we generate a localized orbital which interacts with the Fermi gas, and characterize the relaxation dynamics of both spin degree of freedom as well as charge transport in the presence of the localized orbital "impurity" atoms. [Preview Abstract] |
Tuesday, June 2, 2020 3:30PM - 4:00PM |
D06.00004: Ultracold SU(N) fermions in an optical lattice with controlled symmetry breaking Invited Speaker: Leonardo Fallani I will discuss recent experiments with interacting multicomponent 173Yb fermions in optical lattices. I will focus on the realization of interacting SU(N) Fermi-Hubbard systems, where the addition of a coherent laser coupling between different spin states is used to induce a controlled breaking of the SU(N) global interaction symmetry. This explicit symmetry-breaking action is shown to favour Mott localization and determines the onset of a state-selective behavior. I will discuss the experimental results and the connection with the physics of strongly correlated materials, where a similar orbital-selective behavior arises from coupling between different orbitals. [Preview Abstract] |
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