Phase Diagrams of Periodically Driven Spin–Orbit Coupled 87Rb and 23Na Bose–Einstein Condensates

Published on Jan 1, 2021in Annalen der Physik2.987
· DOI :10.1002/ANDP.202000194
Zhi Lin (Fudan University)
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The authors design an experimentally feasible scheme with ultracold atoms for probing directly and unambiguously the pure topological current that arises from the chiral magnetic effect
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#1Zhi LinH-Index: 3
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We reveal topological currents arising from dipolar parity anomaly in the presence of spatiotemporally weak-dependent energy-momentum separation of paired Dirac points in two-dimensional space-time inversion symmetric semimetals. A corresponding lattice model is proposed to emulate the topological currents by using two-component ultracold atoms in a two-dimensional optical Raman lattice. In our scheme, the topological currents can be generated by varying in-site coupling between the two atomic c...
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#1André Eckardt (MPG: Max Planck Society)H-Index: 28
Time periodic forcing in the form of coherent radiation is a standard tool for the coherent manipulation of small quantum systems like single atoms. In the last years, periodic driving has more and more also been considered as a means for the coherent control of many-body systems. In particular, experiments with ultracold quantum gases in optical lattices subjected to periodic driving in the lower kilohertz regime have attracted a lot of attention. Milestones include the observation of dynamic l...
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#1Jun-Ru Li (Harvard University)H-Index: 7
#2Jeongwon Lee (Harvard University)H-Index: 17
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Spin–orbit coupling in Bose–Einstein condensates creates a density modulation, which is a stripe phase with supersolid properties.
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#1Julian Léonard (ETH Zurich)H-Index: 9
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A supersolid with continuous translational symmetry breaking along one direction is realized by symmetrically coupling a Bose–Einstein condensate to the modes of two optical cavities.
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The recent experimental realization of synthetic spin-orbit coupling (SOC) opens a new avenue for exploring novel quantum states with ultracold atoms. However, in experiments for generating two-dimensional SOC (e.g., Rashba type), a perpendicular Zeeman field, which opens a band gap at the Dirac point and induces many topological phenomena, is still lacking. Here we theoretically propose and experimentally realize a simple scheme for generating two-dimension SOC and a perpendicular Zeeman field ...
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#1Jun-Ru Li (MIT: Massachusetts Institute of Technology)H-Index: 7
#2Wujie Huang (MIT: Massachusetts Institute of Technology)H-Index: 5
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We proposed and demonstrated a new approach for realizing spin orbit coupling with ultracold atoms. We use orbital levels in a double well potential as pseudospin states. Two-photon Raman transitions between left and right wells induce spin-orbit coupling. This scheme does not require near resonant light, features adjustable interactions by shaping the double well potential, and does not depend on special properties of the atoms. A pseudospinor Bose-Einstein condensate spontaneously acquires an ...
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Cold atoms with laser-induced spin-orbit (SO) interactions provide a platform to explore quantum physics beyond natural conditions of solids. Here we propose and experimentally realize two-dimensional (2D) SO coupling and topological bands for a rubidium-87 degenerate gas through an optical Raman lattice, without phase-locking or fine-tuning of optical potentials. A controllable crossover between 2D and 1D SO couplings is studied, and the SO effects and nontrivial band topology are observed by m...
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#1Dan Stamper-Kurn (University of California, Berkeley)H-Index: 45
#2G. E. Marti (NIST: National Institute of Standards and Technology)H-Index: 1
Last. Holger Müller (University of California, Berkeley)H-Index: 42
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While the existence of quantum superpositions of massive particles over microscopic separations has been established since the birth of quantum mechanics, the maintenance of superposition states over macroscopic separations is a subject of modern experimental tests. In Ref. [1], T. Kovachy et al. report on applying optical pulses to place a freely falling Bose-Einstein condensate into a superposition of two trajectories that separate by an impressive distance of 54 cm before being redirected tow...
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#1Lianghui Huang (Shanxi University)H-Index: 9
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Spin–orbit coupling in two dimensions is essential for observing topological phases in ultracold atoms. Such a coupling was produced in a gas of potassium atoms and a robust Dirac point was observed in the energy dispersions of the dressed atoms.
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