Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session Q11: Quantum Gases in Optical Lattices IRecordings Available

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Chair: Julio Barreiro, UCSD Room: Grand Ballroom E 
Thursday, June 2, 2022 8:00AM  8:12AM 
Q11.00001: Magnetically mediated hole pairing in fermionic ladders of ultracold atoms Dominik Bourgund, Sarah Hirthe, Thomas Chalopin, Petar Bojovic, Annabelle Bohrdt, Fabian Grusdt, Eugene Demler, Immanuel Bloch, Timon Hilker Doped antiferromagnets are prime examples of strongly correlated systems and hold the potential to shed light on the emergence of highT_{C} superconductivity in cuprate materials via pairing of mobile dopants. Here we report on the microscopic observation of hole pairing due to the magnetic correlations in a FermiHubbard system by using quantum gas microscopy. We prepare twoleg ladders where we disable tunnelling between the rungs in order to suppress Pauli repulsion and thus drastically increase binding energy of the holes. Observing pairs of holes predominantly occupying the same rung of the ladder allows us to extract a binding energy slightly below the superexchange energy. For higher doping levels we find indications of crystallization of hole pairs. 
Thursday, June 2, 2022 8:12AM  8:24AM 
Q11.00002: Preparation of the spinMott state: a spinful Mott insulator of repulsively bound pairs Jinggang Xiang, Julius de Hond, Enid CruzCol ́on, Woo Chang Chung, Wenlan Chen, William C Burton, Colin J Kennedy, Wolfgang Ketterle We observe and study a special ground state of bosons with two spin states in an optical lattice:the spinMott insulator, a state that consists of repulsively bound pairs which is insulating for bothspin and charge transport. Because of the pairing gap created by the interaction anisotropy, it canbe prepared with low entropy and can serve as a starting point for adiabatic state preparation.We find that the stability of the spinMott state depends on the pairing energy, and observe twoqualitatively different decay regimes, one of which exhibits protection by the gap. 
Thursday, June 2, 2022 8:24AM  8:36AM 
Q11.00003: Mott transition and magnetism of SU(3) fermions in a square lattice Eduardo Ibarra Garcia Padilla, Richard T Scalettar, Shintaro Taie, Yoshiro Takahashi, Kaden R Hazzard The SU(N) FermiHubbard model is attracting strong ongoing interest for its connections to multiorbital solidstate systems and its rich predicted phase diagrams. In this work we study the SU(3) FermiHubbard model in the twodimensional square lattice using determinant Quantum Monte Carlo (DQMC), as a function of the interaction strength U/t and temperature. Previous results in the strongly interacting limit, U/t >> 1, and one particle per site propose the existence of 2sublattice ordering at highT and 3sublattice ordering at lowT. Here we explore if that also occurs at weak and moderate values of the interaction strength, and study the evolution of the compressibility and structure factors to understand at which interaction strengths the system opens a charge gap and when it develops magnetic ordering. These results provide guidance for ongoing optical lattice experiments with ^{173}Yb or ^{87}Sr quantum gas microscopes. 
Thursday, June 2, 2022 8:36AM  8:48AM 
Q11.00004: Experimental measurement and manipulation of unitary fermionic pwave interactions in a 3D optical lattice Coraline J Fujiwara, Vijin Venu, Peihang Xu, Frank Corapi, Robyn Learn, Mikhail Mamaev, Thomas Bilitewski, Jose P D'Incao, Ana Maria Rey, Joseph H Thywissen Resonantly enhanced and controllable pwave interactions in ultracold atomic systems are a promising test bed for realizing exotic manybody states. However, strong threebody loss has traditionally limited experiments to systems of low dimensionality. In this work, we report on experimental spectroscopic measurements of Feshbachenhanced pwave interactions of 40K, where threebody loss is suppressed by loading spin polarized atoms in a deep 3D optical lattice. The resultant interaction energy shifts are in good agreement with analytic predictions of the twobody problem across the Feshbach resonance. The observed lifetimes of strongly interacting pairs (doublons) are consistent with predictions of twobody loss from dipolar relaxation and exceed tens of milliseconds. Measured Rabi oscillations between interacting and noninteracting doublons demonstrate the possibility of coherent manipulation of pwave Feshbach molecules. These pioneering experiments test theoretical predictions of twobody pwave interactions and opens doors towards realizing novel manybody states with them. 
Thursday, June 2, 2022 8:48AM  9:00AM 
Q11.00005: Particle fluctuations and the failure of simple effective models for manybody localized phases Maximilian KieferEmmanouilidis, Razmik Unanyan, Michael Fleischhauer, Jesko Sirker This talk contributes to the ongoing debate whether a manybody localized phase (MBL) of a spinless fermion model with potential disorder and nearestneighbor interactions (tV model) exists or not. In particular, recent evidence suggests that there is a continuing subdiffusive particle transport even deep in the putative MBL phase [1, 2, 3]. Therefore, we investigate and compare the particle number fluctuations in the manybody localized phase with those in the noninteracting case (Anderson localization) and in effective models where only interaction terms diagonal in the Anderson basis are kept. We demonstrate that these types of simple effective models cannot account for the particle number fluctuations observed in the MBL phase of the microscopic model. As a consequence, it appears questionable if the microscopic model possesses an exponential number of exactly conserved local charges. If such a set of conserved local charges does not exist, then particles are expected to ultimately delocalize for any finite disorder strength. 
Thursday, June 2, 2022 9:00AM  9:12AM Withdrawn 
Q11.00006: Barriers to Macroscopic Phases in a 2D AubryAndré Model Dean Johnstone, Patrik Ohberg, Callum W Duncan We study the ground state phases of interacting bosons in the presence of a 2D AubryAndré potential. By using a a meanfield percolation analysis, we focus on several superlattice and quasicrystalline regimes of the 2D AubryAndré model, including generalisations that account for a tilting or skewing of the potential. We show that barriers to the onset of macroscopic phases naturally arise from weakly modulated domains in the 2D AubryAndré model. This leads to the formation of mixed phases, in which the macroscopic properties are dominated by a minority of the system. The phase diagrams then exhibit substantially different features when compared against crystalline systems, including a lobelike or wavelike appearance of the Bose glass, sharp extrusions and extended domains with weak percolation. By studying the 2D AubryAndré model across multiple regimes, we have shown that the unique properties of mixed phases are not distinct to a small set of parameters. 
Thursday, June 2, 2022 9:12AM  9:24AM 
Q11.00007: Coherent control of localization in modulated quasiperiodic lattices Toshihiko Shimasaki, Hasan E Kondakci, Max Prichard, Peter Dotti, Jared E Pagett, Yifei Bai, David M Weld We report experiments demonstrating reversible coherent control of a localization phase transition by phasonic modulation. As background, we recently reported phasonic spectroscopy of a quantum gas in an artificial quasicrystal realized by a bichromatic optical lattice [1]. In that work, we studied how rapid phase modulation of the secondary optical lattice (phason modulation) causes atoms to absorb energy at high harmonics of the drive frequency. In this talk, we discuss phase modulation in a lower frequency regime where excitation into higher bands is not significant but the modulation frequency is high enough to avoid intraband excitations [2]. In particular, we investigated the phase modulation amplitude dependence of the localization properties of the quasicrystal. In this regime, the effect of the phase modulation is to renormalize the effective lattice depth of the phase modulated secondary lattice [1]. By monitoring transport in the modulated bichromatic lattice, we observed that the effective variation of the secondary lattice depth causes a number of localizationdelocalization transitions as the phason drive amplitude is increased. These results open a new path to dynamical coherent control of the transport properties of quantum matter. 
Thursday, June 2, 2022 9:24AM  9:36AM 
Q11.00008: Quantum criticality and universality in the $p$wave paired AubryAndr\'{e}Harper model Ting Lv We investigate the quantum criticality and universality in AubryAndr\'{e}Harper (AAH) model with $p$wave superconducting pairing $\Delta$ in terms of the generalized fidelity susceptibility (GFS). We show that the higherorder GFS is more efficient in spotlighting the critical points than lowerorder ones, and thus the enhanced sensitivity is propitious for extracting the associated universal information from the finitesize scaling in quasiperiodic systems. The GFS obeys powerlaw scaling for localization transitions and thus scaling properties of the GFS provide compelling values of critical exponents. Specifically, we demonstrate that the fixed modulation phase $\phi=\pi$ alleviates the oddeven effect of scaling functions across the AubryAndr\'{e} transition with $\Delta=0$, while the scaling functions 
Thursday, June 2, 2022 9:36AM  9:48AM 
Q11.00009: Bose Glass Transition in a TwoDimensional Optical Quasicrystal Lee C Reeve, JrChiun Yu, Shaurya A Bhave, Emmanuel Gottlob, Georgia Nixon, Bo Song, Ulrich Schneider A quasicrystal is a nonperiodic yet longrange ordered structure, which provides an fascinating testing ground for a variety of phenomena, particularly those of disordered manybody systems. One such intriguing phenomenon is localization, which can typically be induced by either the presence of sufficient disorder, or strong interactions, leading to Anderson or Mott insulators respectively. Interestingly, the interplay of interactions and disorder can produce a new state, the socalled Bose glass phase. 
Thursday, June 2, 2022 9:48AM  10:00AM 
Q11.00010: Contourtime approach to the disordered BoseHubbard model in the strong coupling regime Ali Mokhtari Jazi, Matthew R Fitzpatrick, Malcolm P Kennett There has been considerable recent interest in the disordered Bose Hubbard model (BHM) in recent years, particularly in the context of thermalization and manybody localization. We develop a twoparticle irreducible (2PI) strongcoupling approach to the disordered BHM that allows us to treat both equilibrium and outofequilibrium situations. We obtain equations of motion for spatiotemporal correlations and explore their equilibrium solutions. We study the equilibrium phase diagram as a function of disorder strength and discuss applications of the formalism to outofequilibrium situations. 
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