Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session L59: Supersolid Formation in Quantum GasesInvited
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Sponsoring Units: DAMOP Chair: Dominik Schneble, Stony Brook University Room: LACC Petree Hall D |
Wednesday, March 7, 2018 11:15AM - 11:51AM |
L59.00001: Supersolidity and intertwined order parameters in a quantum gas Invited Speaker: Andrea Morales Supersolidity is a paradoxical state of matter featuring the crystalline order of a solid and the dissipationless flow of a superfluid. The realization of this state of matter requires the breaking of two continuous symmetries, the phase invariance of a superfluid and the translational invariance to form the crystal. Proposed for He almost 50 years ago, its experimental verification remained elusive. |
Wednesday, March 7, 2018 11:51AM - 12:27PM |
L59.00002: Supersolid phases of ultracold neutral atoms with light-mediated interactions Invited Speaker: Francesco Piazza Supersolids are characterised by the coexistence of superfluid and crystalline order. Triggered by the first experiments with Helium, efforts have been made to realise this intriguing phase of matter in simpler and more controllable systems. One promising platform involves ultracold neutral atoms strongly coupled to light fields. The latter mediate interactions of very long range favouring the formation of crystalline order. Very recently, two different experiments have indeed observed phases were a Bose-Einstein condensate spontaneously breaks a continuous translation invariance due to light-mediated interactions [Nature 543,87(2017); arXiv:1709.02028]. In this talk, I will discuss our theoretical understanding of these experiments and illustrate how their different properties arise from different underlying spatial symmetries. |
Wednesday, March 7, 2018 12:27PM - 1:03PM |
L59.00003: A stripe phase with supersolid properties in spin–orbit-coupled Bose–Einstein condensates Invited Speaker: Jun-Ru Li Supersolidity combines superfluid flow with long-range spatial periodicity of solids, two properties that are often mutually exclusive. The original discussion of quantum crystals and supersolidity focused on solid 4He and triggered extensive experimental efforts that, instead of supersolidity, revealed exotic phenomena including quantum plasticity and mass supertransport. The concept of supersolidity was then generalized from quantum crystals to other superfluid systems that break continuous translational symmetry. Bose–Einstein condensates with spin-orbit coupling are predicted to possess a stripe phase with supersolid properties. Despite several recent studies of the miscibility of the spin components of such a condensate, the presence of stripes has not been detected. Here we observe the predicted density modulation of this stripe phase using Bragg reflection (which provides evidence for spontaneous long-range order in one direction) while maintaining a sharp momentum distribution (the hallmark of superfluid Bose–Einstein condensates). Our work thus establishes a system with continuous symmetry-breaking properties, associated collective excitations and superfluid behavior. |
Wednesday, March 7, 2018 1:03PM - 1:39PM |
L59.00004: Dipolar quantum droplets and striped states Invited Speaker: Matthias Wenzel I present experimental results on magnetic quantum fluids, consisting of a dilute Bose-Einstein condensate of dysprosium atoms. |
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