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| − | Jan 6 - Jan 12 Zehan Li, Jan 13 - Jan 19 Haiping Hu, Jan 22 - Jan 27 Sayan Choudhury
| + | #[[Arxiv Selection Dec 2020]] |
| − | | + | #[[Arxiv Selection Nov 2020]] |
| − | | + | #[[Arxiv Selection Oct 2020]] |
| − | ==Jan 6==
| + | #[[Arxiv Selection Sep 2020]] |
| − | | + | #[[Arxiv Selection Aug 2020]] |
| − | arXiv:2001.00795 (cross-list from quant-ph) [pdf, other]
| + | #[[Arxiv Selection Jul 2020]] |
| − | | + | #[[Arxiv Selection Jun 2020]] |
| − | A subradiant optical mirror formed by a single structured atomic layer
| + | #[[Arxiv Selection May 2020]] |
| − | | + | #[[Arxiv Selection Apr 2020]] |
| − | Jun Rui, David Wei, Antonio Rubio-Abadal, Simon Hollerith, Johannes Zeiher, Dan M. Stamper-Kurn, Christian Gross, Immanuel Bloch
| + | #[[Arxiv Selection Mar 2020]] |
| − | | + | #[[Arxiv Selection Feb 2020]] |
| − | Comments: 8 pages, 5 figures + 12 pages Supplementary Infomation
| + | #[[Arxiv Selection Jan 2020]] |
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| − | Subjects: Quantum Physics (quant-ph); Quantum Gases (cond-mat.quant-gas); Atomic Physics (physics.atom-ph); Optics (physics.optics)
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| − | ==Jan 7==
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| − | arXiv:2001.01487 (cross-list from nlin.PS) [pdf, other]
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| − | Singular solitons
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| − | Hidetsugu Sakaguchi, Boris A. Malomed
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| − | Comments: to be published in Physical Review E
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| − | Subjects: Pattern Formation and Solitons (nlin.PS); Quantum Gases (cond-mat.quant-gas); Optics (physics.optics)
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| − | We demonstrate that the commonly known concept, which treats solitons as nonsingular solu- tions produced by the interplay of nonlinear self-attraction and linear dispersion, may be extended to include modes with a relatively weak singularity at the central point, which keeps their inte- gral norm convergent. Such states are generated by self-repulsion, which should be strong enough, namely, represented by septimal, quintic, and usual cubic terms in the framework of the one-, two-, and three-dimensional (1D, 2D, and 3D) nonlinear Schro ̈dinger equations (NLSEs), respectively. Although such solutions seem counterintuitive, we demonstrate that they admit a straightforward interpretation as a result of screening of an additionally introduced attractive delta-functional po- tential by the defocusing nonlinearity. The strength (“bare charge”) of the attractive potential is infinite in 1D, finite in 2D, and vanishingly small in 3D. Analytical asymptotics of the singular solitons at small and large distances are found, entire shapes of the solitons being produced in a numerical form. Complete stability of the singular modes is accurately predicted by the anti- Vakhitov-Kolokolov criterion (under the assumption that it applies to the model), as verified by means of numerical methods. In 2D, the NLSE with a quintic self-focusing term admits singular- soliton solutions with intrinsic vorticity too, but they are fully unstable. We also mention that dissipative singular solitons can be produced by the model with a complex coefficient in front of the nonlinear term.
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| − | ==Jan 8==
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| − | arXiv:2001.01925 [pdf, other]
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| − | Density wave propagation in a two-dimensional random dimer potential: from a single to a bipartite square lattice
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| − | Pablo Capuzzi, Patrizia Vignolo
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| − | Comments: 9 pages, 7 figures
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| − | Journal-ref: Phys. Rev. A 101, 013601 (2020)
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| − | Subjects: Quantum Gases (cond-mat.quant-gas); Disordered Systems and Neural Networks (cond-mat.dis-nn)
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| − | We study the propagation of a density perturbation in a weakly interacting boson gas confined on a lattice and in the presence of square dimerized impurities. Such a two-dimensional random-dimer model (2D-DRDM), previously introduced in [Capuzzi et al., Phys. Rev. A 92, 053622 (2015)], is the disorder transition from a single square lattice, where impurities are absent, to a bipartite square lattice, where the number of impurities is maximum and coincides with half the number of lattice sites. We show that disorder correlations can play a crucial role in the dynamics for a broad range of parameters by allowing density fluctuations to propagate in the 2D-DRDM lattice, even in the limit of strong disorder. In such a regime, the propagation speed depends on the percentage of impurities, interpolating between the speed in a single monoperiodic lattice and that in a bipartite one.
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| − | ==Jan 9==
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| − | arXiv:2001.02315 [pdf, ps, other]
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| − | Driving Quantum Correlated Atom-Pairs from a Bose-Einstein Condensate
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| − | Liang-Ying Chih, Murray Holland
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| − | Subjects: Quantum Gases (cond-mat.quant-gas); Quantum Physics (quant-ph)
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| − | The ability to cool quantum gases into the quantum degenerate realm has opened up possibilities for an extreme level of quantum-state control. In this paper, we investigate one such control protocol that demonstrates the resonant amplification of quasimomentum pairs from a Bose-Einstein condensate by the periodic modulation of the two-body s-wave scattering length. This shows a capability to selectively amplify quantum fluctuations with a predetermined momentum, where the momentum value can be spectroscopically tuned. A classical external field that excites pairs of particles with the same energy but opposite momenta is reminiscent of the coherently-driven nonlinearity in a parametric amplifier crystal in nonlinear optics. For this reason, it may be anticipated that the evolution will generate a ‘squeezed’ matter-wave state in the quasiparticle mode on resonance with the modulation frequency. Our model and analysis is motivated by a recent experiment by Clark et al. that observed a time-of- flight pattern similar to an exploding firework [1]. Since the drive is a highly coherent process, we interpret the observed firework patterns as arising from a monotonic growth in the two-body correlation amplitude, so that the jets should contain correlated atom pairs with nearly equal and opposite momenta. We propose a potential future experiment based on applying Ramsey interferometry to experimentally probe these pair correlations.
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| − | ==Jan10==
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| − | arXiv:2001.02686 [pdf, other]
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| − | Observation of Dynamical Quantum Phase Transition with Correspondence in Excited State Phase Diagram
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| − | T. Tian, H.-X. Yang, L.-Y. Qiu, H.-Y. Liang, Y.-B. Yang, Y. Xu, L.-M. Duan
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| − | Comments: 7 pages; 6 figures; Physical Review Letters accepted
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| − | Subjects: Quantum Gases (cond-mat.quant-gas); Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
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| − | Dynamical quantum phase transitions are closely related to equilibrium quantum phase transitions for ground states. Here, we report an experimental observation of a dynamical quantum phase transition in a spinor con- densate with correspondence in an excited state phase diagram, instead of the ground state one. We observe that the quench dynamics exhibits a non-analytical change with respect to a parameter in the final Hamiltonian in the absence of a corresponding phase transition for the ground state there. We make a connection between this sin- gular point and a phase transition point for the highest energy level in a subspace with zero spin magnetization of a Hamiltonian. We further show the existence of dynamical phase transitions for finite magnetization corre- sponding to the phase transition of the highest energy level in the subspace with the same magnetization. Our results open a door for using dynamical phase transitions as a tool to probe physics at higher energy eigenlevels of many-body Hamiltonians.
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