Bulletin of the American Physical Society
47th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 61, Number 8
Monday–Friday, May 23–27, 2016; Providence, Rhode Island
Session J2: Invited Session: Developments with Quantum Gas MicroscopesInvited
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Chair: Andrew Daley, The University of Strathclyde Room: Ballroom B |
Wednesday, May 25, 2016 2:00PM - 2:30PM |
J2.00001: A quantum gas microscope for ytterbium atoms Invited Speaker: Yoshiro Takahashi In this talk, I report on the development of a quantum gas microscope for ytterbium (Yb) atoms. By using a dual molasses technique in which 399 nm molasses beams of the broad singlet transition are applied for fluorescence imaging and 556 nm molasses beams of the narrow intercombination transition are applied for cooling during the imaging, we successfully demonstrate site-resolved imaging of individual bosonic $^{\mathrm{174}}$Yb atoms in a two-dimensional optical lattice with a lattice constant of 266 nm.We also apply a high resolution laser spectroscopy using the ultranarrow intercombination transition between the $^{\mathrm{1}}$S$_{\mathrm{0}}$ and $^{\mathrm{3}}$P$_{\mathrm{2}}$ states to manipulate an atom distribution in an optical lattice. We expect the demonstrated technique will similarly work for other isotopes of Yb atoms. We are also developing a different mode of an Yb quantum gas microscope. [Preview Abstract] |
Wednesday, May 25, 2016 2:30PM - 3:00PM |
J2.00002: Quantum Gas Microscopy - a Close-Up of Entanglement, Quantum Statistical Physics and Fermions Invited Speaker: Markus Greiner With quantum gas microscopy we are able to take the control of ultra cold quantum gases in an optical lattice to the next and ultimate level of high fidelity addressing, manipulation and readout of single particles. In my talk I will present experiments in which quantum gas microscopy allows us to directly measure entanglement entropy in a quantum many-body system. I will talk about the measurement of entanglement growth after a quench, which enables us to carry out experiments on the foundations of quantum statistical mechanics. Finally I will report on quantum gas microscopy of the Fermi-Hubbard model and the observation of several quantum phases. [Preview Abstract] |
Wednesday, May 25, 2016 3:00PM - 3:30PM |
J2.00003: Fermionic Mott Insulators, Band Insulators, and Metals under the Quantum Gas Microscope Invited Speaker: Martin Zwierlein Strongly correlated fermions pose some of the most difficult challenges to many-body theory. A prime example is the Fermi-Hubbard model, believed to hold the key to our understanding of high-temperature superconductors. It describes repulsive spinful fermions moving through a crystal lattice, a situation that can be realized in pristine fashion with ultracold fermionic atoms in optical lattices. The recent development of quantum gas microscopes for fermionic atoms now allows for a microscopic view of the phases encountered in the Fermi-Hubbard model, with a resolution at the single-atom, single-lattice site level. I will present our recent observation of the crossover between metallic, band insulating and Mott insulating phases in two-dimensional Fermi gases. The equation of state is directly obtained from density profiles, revealing an entropy per particle that is almost entirely dominated by the unobserved spin degree of freedom. [Preview Abstract] |
Wednesday, May 25, 2016 3:30PM - 4:00PM |
J2.00004: A quantum-gas microscope for fermionic 40-potassium Invited Speaker: Stefan Kuhr Single-atom-resolved detection in optical lattices using quantum-gas microscopes has enabled a new generation of experiments in the field of quantum simulation. Here we demonstrate single-site- and single-atom-resolved florescence imaging of fermionic potassium-40 atoms in a quantum-gas microscope setup using electromagnetically-induced-transparency cooling [E. Haller et al., Nature Physics 11, 738 (2015)]. We detected on average 1000 fluorescence photons from a single atom within 1.5s, while keeping it close to the vibrational ground state of the optical lattice. Our fermionic quantum-gas microscope will provide the possibility to probe quantities that are difficult to access in bulk systems, such as spin-spin-correlation functions or string-order. It would allow the study of, e.g. the Fermi-Hubbard Model and allow for the direct observation of band insulators, metallic phases and Mott insulators at the single-atom level. Future studies could include out-of-equilibrium dynamics, and the direct observation of entanglement build-up of in many-particle fermionic quantum systems. [Preview Abstract] |
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