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						<h1 itemprop="headline">Foredrag - Kunal K. Das: Ultracold Atoms in Ring Lattices</h1>
						
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									<p><strong>Title:&nbsp; Ultracold Atoms in Ring Lattices</strong>
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<p><strong>Speaker:&nbsp; Kunal K. Das, Professor at Kutztown University of Pennsylvania</strong>
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<p><strong>Abstract</strong><br>With two different kinds of periodicities a toroidal or ring-shaped lattice trap introduces new possibilities for ultracold atoms, we will consider some of those here:
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<p>Counter-circulating modes of a Bose-Einstein condensate (BEC) in such a trap demonstrate nonlinear criticality with self-trapping and oscillatory regimes, which in the mean-field picture sharply enhances sensitivity to rotation. Quantum fluctuations also however increase near criticality, and we suggest ways to suppress them in the relevant quadrature, by utilizing spin-squeezing.
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<p>When the nonlinearity is modulated at half the lattice constant, variation of the amplitude and phase of the modulation accesses various spin squeezing regimes, particularly both one-axis twisting and the elusive two-axes counter-twisting, and generally enables comprehensive realization of the broadly relevant Lipkin-Meshkov-Glick model.
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<p>We will also outline how ring topology can be used to implement gauge structures and features related to geometric phase.</p>
								
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