CQT Colloquium by Yoshiro Takahashi, Kyoto University, Kyoto, Japan
Title: Quantum Simulation with Ultracold Atoms in an Optical lattice Date/Time: 09-May, 04:00PM Venue: CQT Level 3 Seminar Room, S15-03-15
Abstract: Ultracold quantum gases with atomic Bose-Einstein condensates and Fermi degenerate gases offer important experimental platforms for various kinds of researches from precision measurement and quantum science. One of the interesting researches is the quantum simulation of strongly correlated many-body systems with ultracold quantum gases loaded into an optical lattice which is a periodic potential for atoms. First I will review some key experiments of quantum simulation performed with alkaline atoms. Then I report some of our recent experiments of quantum simulation with two-electron atoms of ytterbium(Yb) in an optical lattice which offer unique possibilities in the quantum simulation research. In particular, we successfully detect antiferromagnetic spin correlations of SU(N) Fermi gases of 173Yb in various lattice geometries, which is an important step in the study of novel SU(N) quantum magnetism and possible exotic superfluidity. Kondo impurity physics is also studied by a two-orbital system of a Fermi gas of 171Yb loaded in a novel optical lattice. We also study dissipative Bose and Fermi Hubbard model with the controlled two-body dissipation.
References  Antiferromagnetic Spin Correlation of SU(N) Fermi Gas in an Optical Superlattice, H. Ozawa, S. Taie, Y. Takasu, and Y. Takahashi ,Phys. Rev. Lett. 121, 225303 (2018), Antiferromagnetic Interorbital Spin-Exchange Interaction of 171Yb, K. Ono, J. Kobayashi, Y. Amano, K. Sato, and Y. Takahashi, arXiv:1810.00536,  Observation of the Mott insulator to superfluid crossover of a driven-dissipative Bose-Hubbard system, T. Tomita, S. Nakajima, I. Danshita, Y. Takasu and Y. Takahashi, Sci. Adv. 3, e1701513 (2017).