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 C05: Bose-Einstein Condensates IRecordings Available
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Chair: Dominik Schneble, Stony Brook Room: Salon 9/10 |
Tuesday, May 31, 2022 11:00AM - 11:12AM |
C05.00001: Free space single-site-resolved imaging in an erbium quantum gas microscope Lin Su, Alec Douglas, Robin Groth, Ognjen Markovic, Markus Greiner We demonstrate single-site-resolved imaging at greater than 99.5% fidelity using shorter than 10 microsecond resonant beam pulses in our erbium quantum gas microscope. Whereas conventional quantum gas microscope experiments image the atoms in tightly spaced lattices and must collect thousands of photons per atom, our experiment transfers the atoms into variable spacing accordion lattices to enable high fidelity imaging using as few as 20 detected photons. The rapid imaging makes it possible to turn trapping lattices off, opening the door to double-occupancy readout, phase coherence readout, and multi-spin-state readout. The setup is also technically simple without the complexity of cooling or pinning lattices. The imaging method presented here, along with dipolar interactions between erbium atoms, paves the way to single-site-resolved studies of exotic quantum phases generated by Hubbard models extended with nearest-neighbor interactions. |
Tuesday, May 31, 2022 11:12AM - 11:24AM |
C05.00002: Towards an isothermal cold-atom Feshbach engine Hector Mas, Roshan Sajjad, Ethan Q Simmons, Jeremy Tanlimco, Eber Nolasco-Martinez, David M Weld
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Tuesday, May 31, 2022 11:24AM - 11:36AM |
C05.00003: Collisions and scattering in ultracold atomic clouds Annesh Mukhopadhyay, Md Kamrul Hoque Ome, Sean Mossman, Qingze Guan, Doerte Blume, Peter W Engels This presentation describes a combined experimental and theoretical study of quantum mechanical scattering between atoms in a dilute-gas Bose-Einstein condensate. We focus on condensates with high enough densities such that a very rich sequence of multiple scattering events has to be taken into account. In our experiments, we generate superposition of two different momentum states and image the resulting scattering effects in time-of-flight imaging. Scattering between particles in the same or in different spin states can be induced. The experiments are accompanied by theoretical studies that develop a model taking scattering cascades into account. A surprising complexity of the dynamics is revealed even in conceptually simple experimental configurations. |
Tuesday, May 31, 2022 11:36AM - 11:48AM |
C05.00004: Simulating Astrophysics with Catastrophe Atom Optics Ryan Corbin, Michael M Forbes, Maren E Mossman, Peter W Engels Atom lasers provide a powerful method for studying coherence in Bose-Einstein Condensates (BECs), with many applications, including matter-wave interference, the quantum-classical boundary, and catastrophe theory. Here we probe a Rb87 atom laser with an attractive gaussian potential to simulate astrophysical phenomena. As an example, we demonstrate phenomena reminiscent of Bondi-Hoyle accretion. |
Tuesday, May 31, 2022 11:48AM - 12:00PM |
C05.00005: Bose polarons in a homogeneous 3D Bose-Einstein condensate Jiri Etrych, Alec Cao, Gevorg Martirosyan, Lena Dogra, Zoran Hadzibabic, Christoph Eigen We study Bose polarons in a homogeneous Bose-Einstein condensate, from weak to strong impurity-boson interactions. Our uniform 39K condensate is produced in an optical-box trap, the polarons are formed using rf-injection between spin states, and the impurity-boson interactions are tuned via an interstate magnetic Feshbach resonance. We measure the polaron energy and spectral response across the resonance, observing reduced inhomogeneous broadening compared to previous harmonic-trap experiments. We also explore the effects of condensate density and impurity concentration. |
Tuesday, May 31, 2022 12:00PM - 12:12PM |
C05.00006: Rapid generation of all-optical 39K Bose-Einstein condensates using a low-field Feshbach resonance Alexander Herbst, Henning Albers, Knut Stolzenberg, Sebastian Bode, Dennis Schlippert Ultracold potassium is a promising candidate for quantum technological applications as it allows changing intra-atomic interactions via low-field magnetic Feshbach resonances. However, the realization of high-flux sources of Bose-Einstein condensates remains challenging due to the necessity of optical trapping to use magnetic fields as external degree of freedom. We investigate the production of all-optical 39K Bose-Einstein condensates under different scattering lengths using a low-field Feshbach resonance near 33 G. By tuning the scattering length in a range between 75 a0 and 300 a0 we demonstrate a trade off between evaporation speed and final atom number and decrease our evaporation time by a factor of 5 while approximately doubling the atomic flux. To this end, we are able to produce fully condensed ensembles with 5×104 atoms within 850 ms evaporation time at a scattering length of 232 a0 and 1.6×105 atoms within 4 s at 158 a0, respectively. We deploy a numerical model to analyse the flux and atom number scaling with respect to scattering length, identify current limitations and simulate the optimal performance of our setup. Based on our findings we describe routes towards high-flux sources of ultra-cold potassium for inertial sensing. |
Tuesday, May 31, 2022 12:12PM - 12:24PM |
C05.00007: Cavity Optomechanical Sensing and Manipulation of an Atomic Persistent Current Pardeep Kumar, Tushar Biswas, Kristian Feliz, Rina Kanamoto, M.-S. Chang, Anand K. Jha, M. Bhattacharya One of the challenging tasks of atomic physics is to sense the circulation of a rotating annular Bose-Einstein condensate (BEC). Here, we propose a versatile technique1 that overcomes this outstanding problem by utilizing tools of cavity optomechanics. The model under consideration is an annular rotating BEC interacting with orbital angular momentum carrying light beams inside an optical resonator. It is the first platform that can measure the rotation of a ring BEC with minimal destruction, in situ and in real-time, unlike the existing fully destructive techniques. For experimentally accessible parameters, the proposed method improves the rotation sensitivity of ring BECs by three orders of magnitude. The model also shows a unique way to manipulate rotating matter waves and generate optomechanical entanglement between persistent currents. Our work constitutes a novel paradigm for the sensing, characterization, and coherent manipulation of the atomic current. This opens up the possibility to use atomic superflow for useful applications such as storage and retrieval of information. |
Tuesday, May 31, 2022 12:24PM - 12:36PM |
C05.00008: Hamiltonian Formulation of Thermo-Optic Photon-Photon Interaction in Photon BECs Enrico Stein, Axel Pelster Since the discovery of photon Bose-Einstein condensates in 2010 [1] this phenomenon has been studied extensively. At its core, this system consists of a dye solution filling the microcavity in which the photons are trapped. Due to cyclic absorption and re-emission processes of photons, the dye leads to a thermalisation of the photon gas at room temperature and finally to its Bose-Einstein condensation. Because of a non-ideal quantum efficiency, those cycles yield in addition a heating of the dye solution, which results in an effective photon-photon interaction [2]. |
Tuesday, May 31, 2022 12:36PM - 12:48PM |
C05.00009: Mesoscopic transport with weakly-interacting Bose gases Shun Uchino Utracold atomic gases play crucial roles in revealing nontrivial quantum transport phenomena. Especially, quantum transport of weakly-interacting Bose gases would be interesting in that the realizations with condensed-matter systems are difficult. |
Tuesday, May 31, 2022 12:48PM - 1:00PM |
C05.00010: Feasibility of ground-based shell-shaped BECs Alexander Wolf, Patrick B Boegel, Naceur Gaaloul, Maxim Efremov, Matthias Meister Many-body systems confined in shells have recently experienced a huge progress offered by ongoing experiments in orbital microgravity, which have already made crucial steps towards creating the first shell-shaped Bose-Einstein condensate (BEC) [1]. However, in principle there are two complementary methods for realization of such shells in ground-based laboratories: (i) a harmonically trapped dual-component mixture with equal trap frequencies combined with tunable inter-component interaction [2], and (ii) a single-component BEC in a bichromatic optical dipole trap where gravity is compensated by a magnetic field gradient. |
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