Bulletin of the American Physical Society
48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 62, Number 8
Monday–Friday, June 5–9, 2017; Sacramento, California
Session P2: Novel MagnetismInvited
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Chair: Vito Scarola, Virginia Institute of Technology Room: 306-307 |
Thursday, June 8, 2017 2:00PM - 2:30PM |
P2.00001: Magnetic Correlations in Cold Atomic Systems Invited Speaker: Lode Pollet Magnetic correlations have recently been measured experimentally in cold atomic systems. These stretch over the entire system size fitting under the fermionic microscope realizing Heisenberg antiferromagnetism and constitute one of the greatest developments in recent years in this field. In the first part of the talk I review the experiment performed in the Bloch/Gross group by M. Boll et al (Science 353, Iss 6305, p. 1257 (2016) ) on Hubbard chains, demonstrating a simultaneous measurement of spin and charge. Correlations up to three sites have been discerned, allowing to extract an entropy density not greater than 0.5. I briefly comment on recent developments by this team. In the second part I move on to the two-dimensional case. The establishment of an antiferromagnetic Heisenberg phase in the Greiner lab (A. Mazurenko et al, arXiv:1612.08436) paves the way to study open questions in the doped regime. Finally, I discuss the challenges to study FFLO instabilities (J. Gukelberger et al, Phys. Rev. B 94, 075157 (2016)) for Hubbard systems with population imbalance as well as p-wave superfluidity by spin-nematic Fermi surface deformations (J. Gukelberger et al, Phys. Rev. Lett. 113, 195301 (2014) and Ising antiferromagnetic transitions in explicitly $SU(2)$ broken Hubbard models. [Preview Abstract] |
Thursday, June 8, 2017 2:30PM - 3:00PM |
P2.00002: One-dimensional Fermi gases with odd-wave interaction Invited Speaker: Xiaoling Cui In this talk, I will discuss the intriguing physics induced by odd-wave interaction in one-dimensional(1D) Fermi gases. First, I will show that by applying a weak odd-wave attraction (or repulsion), the long-sought magnetic orders of itinerant Ferromagnetism (or Neel anti-ferromagnetism) can be conveniently engineered in the strongly interacting spin-1/2 trapped Fermi gas. Second, I will show that a spinless Fermi gas near odd-wave resonance and confined in optical lattices can be a promising system to realize the Kitaev chain model. By exactly solving the two-body problem we have established an effective lattice model for lowest-band fermions, which paves the way for quantum simulating Majorana fermions in 1D atomic systems. [Preview Abstract] |
Thursday, June 8, 2017 3:00PM - 3:30PM |
P2.00003: Photonic Landau Levels in Curved Space Invited Speaker: Jonathan Simon I will present recent work realizing topological phases of photons in curved space. The talk will focus on our recent exploration of Landau levels on a conical surface, generated using a non-planar (twisted) optical resonator to induce a synthetic magnetic field for optical photons, and employed to validate the Wen-Zee action describing the interplay of manifold curvature and magnetic fields. I will then describe experiments demonstrating interactions between individual resonator photons mediated by cavity Rydberg electromagnetically induced transparency (cReit). I will conclude with an outlook on marrying twisted resonators and cReit to assemble topological few-body states either photon-by-photon or through engineered photonic thermalizers. This work showcases the unique possibilities for Hamiltonian engineering and control in the photonic sector, a provides a taste of ongoing and upcoming breakthroughs in photonic quantum materials. [Preview Abstract] |
Thursday, June 8, 2017 3:30PM - 4:00PM |
P2.00004: Quantum simulation of the 2D Hubbard model Invited Speaker: Michael Koehl We experimentally study the emergence of antiferromagnetic correlations between ultracold fermionic atoms in a two dimensional optical lattice with decreasing temperature. We determine the uniform magnetic susceptibility of the two-dimensional Hubbard model from simultaneous measurements of the in-situ density distribution of both spin components. At half filling and strong interactions our data approach the Heisenberg model of localized spins with antiferromagnetic correlations. Furthermore, we study quantum criticality in the two-dimensional Hubbard model, observe universal scaling, and find the dynamical critical exponent of the metal-insulator transition. [Preview Abstract] |
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