Raman-Induced Interactions in a Single-Component Fermi Gas Near an<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-Wave Feshbach Resonance

Williams, R. A.; Beeler, Matthew; LeBlanc, Lindsay J.; Jiménez-García, Karina; Spielman, I. B.

doi:10.1103/physrevlett.111.095301

Cited by 161 publications

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“…Assuming the molecular and atomic magnetic moments differ μ m ≠ 2μ a , the vector light shift can bring the molecular states closer to the scattering state, inducing a resonant atom-molecule coupling. Optical shifts of a magnetic Feshbach resonance have been observed using specific bound-to-bound transitions [25][26][27][28] and recently using a far-detuned laser [38]. Since our scheme does not rely on proximity to any atomic or molecular transitions, the lifetime is only limited by the one-body off-resonant scattering rate.…”

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confidence: 97%

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Casting New Light on Atomic Interactions

Vale

2015

Physics

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Optical control of atomic interactions in quantum gases is a long-sought goal of cold atom research. Previous experiments have been hindered by rapid decay of the quantum gas and parasitic deformation of the trap potential. We develop and implement a generic scheme for optical control of Feshbach resonances which yields long quantum gas lifetimes and a negligible parasitic dipole force. We show that fast and local control of interactions leads to intriguing quantum dynamics in new regimes, highlighted by the formation of van der Waals molecules and localized collapse of a Bose condensate. DOI: 10.1103/PhysRevLett.115.155301 PACS numbers: 67.85.-d, 03.75.Kk, 34.50.-s Spatiotemporal control of interactions should bring a plethora of new quantum-mechanical phenomena into the realm of ultracold atom research. Temporal modulation of interactions is theoretically proposed as a route for creating anyonic statistics in optical lattices [1,2] as well as new types of quantum liquids [3,4] and excitations [5][6][7]. Spatial modulation should grant access to unusual soliton behavior [8,9], controlled interfaces between quantum phases [10], stable nonlinear Bloch oscillations [11], and even the dynamics of acoustic black holes [12]. The conventional technique for controlling interactions in cold atoms, magnetic Feshbach resonance [13,14], is typically insufficient for these applications because magnetic coils are generally too large for very fast or local modulation.A promising alternative is optical control of Feshbach resonances (OFR), with which high speed, spatially resolved control of interactions can be realized. Efforts toward achieving OFR in quantum gases have made significant progress [15-28] but have encountered two major obstacles. First, in previous experiments OFR has limited the quantum gas lifetime to the millisecond time scale [24,26,27] due to optical excitation to molecular states. Short lifetimes forbid studies of quantum gases in equilibrium or after typical dynamical time scales. Second, the change of interaction strength from OFR is often accompanied by an optical potential. This potential can result in a parasitic dipole force which dominates the dynamics when the interactions are spatially modulated [21].In this Letter we propose and implement a scheme for optically controlling interactions while maintaining a long quantum gas lifetime and negligible parasitic dipole force. With a far-detuned laser, a change of the scattering length a, which determines the interaction strength, by 180 Bohr radii (a 0 ) is only coupled with a slow radiative loss of 1.6 s −1 . This loss rate is sufficiently low to allow the BEC to remain in equilibrium. Furthermore, the laser operates at a magic wavelength to eliminate the atomic dipole potential. We apply OFR to test the response of Bose-Einstein condensates (BECs) to rapid oscillation of interactions down to the time scale of 10 ns, reaching beyond the van der Waals energy scale. Moreover, by spatially modulating the interaction strength we observe the intriguing...

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confidence: 97%

“…Efforts toward achieving OFR in quantum gases have made significant progress [15][16][17][18][19][20][21][22][23][24][25][26][27][28] but have encountered two major obstacles. First, in previous experiments OFR has limited the quantum gas lifetime to the millisecond time scale [24,26,27] due to optical excitation to molecular states.…”

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confidence: 99%

Casting New Light on Atomic Interactions

Vale

2015

Physics

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“…|F, M F = |9/2, −7/2 and |9/2, −9/2 states [7,8], in contrast, the a ↑↓ scattering length is tunable while swave scattering is forbidden for the up-up and downdown channels. The present work considers cases 2a-2d (see Table I).…”

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confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…By now, the effect of the spin-orbit coupling (or more precisely, spin-momentum coupling) has been investigated for bosonic and fermionic species [5][6][7][8][9][10][11]. The effect of the spin-orbit coupling has been investigated away and near an s-wave FanoFeshbach resonance [7,8]. A variety of intriguing phenomena such as non-equilibrium dynamics [9,10], the spin-orbit coupling assisted formation of molecules [7], and the engineering of band structures [11] have been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Harmonically trapped two-atom systems: Interplay of short-ranges-wave interaction and spin-orbit coupling

Yin

Gopalakrishnan²,

Blume

2014

Phys. Rev. A

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The coupling between the spin degrees of freedom and the orbital angular momentum has a profound effect on the properties of nuclei, atoms and condensed matter systems. Recently, synthetic gauge fields have been realized experimentally in neutral cold atom systems, giving rise to a spin-orbit coupling term with "strength" kso. This paper investigates the interplay between the single-particle spin-orbit coupling term of Rashba type and the short-range two-body s-wave interaction for cold atoms under external confinement. Specifically, we consider two different harmonically trapped two-atom systems. The first system consists of an atom with spin-orbit coupling that interacts with a structureless particle through a short-range two-body potential. The second system consists of two atoms that both feel the spin-orbit coupling term and that interact through a short-range two-body potential. Treating the spin-orbit term perturbatively, we determine the correction to the ground state energy for various generic parameter combinations. Selected excited states are also treated. An important aspect of our study is that the perturbative treatment is not limited to small s-wave scattering lengths but provides insights into the system behavior over a wide range of scattering lengths, including the strongly-interacting unitary regime. We find that the interplay between the spin-orbit coupling term and the s-wave interaction generically enters, depending on the exact parameter combinations of the s-wave scattering lengths, at order k 2 so or k 4 so for the ground state and leads to a shift of the energy of either sign. While the absence of a term proportional to kso follows straightforwardly from the functional form of the spin-orbit coupling term, the absence of a term proportional to k 2 so for certain parameter combinations is unexpected. The well-known fact that the spin-orbit coupling term couples the relative and center of mass degrees of freedom has interesting consequences for the trapped two-particle systems. For example, we find that the spin-orbit coupling term turns, for certain parameter combinations, sharp crossings into avoided crossings with an energy splitting proportional to kso. Our perturbative results are confirmed by numerical calculations that expand the eigenfunctions of the two-particle Hamiltonian in terms of basis functions that contain explicitly correlated Gaussians.

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Simulating Artificial 1D Physics with Ultra‐Cold Fermionic Atoms: Three Exemplary Themes

Dobrzyniecki

Sowiński

2020

Adv Quantum Tech

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For over twenty years, ultra‐cold atomic systems have formed an almost perfect arena for simulating different quantum many‐body phenomena and exposing their non‐obvious and very often counterintuitive features. Thanks to extremely precise controllability of different parameters they are able to capture different quantum properties which were previously recognized only as theoretical curiosities. Herein, the current experimental progress in exploring the curious 1D quantum world of fermions is traced from the perspective of three subjectively selected trends being currently under vigorous experimental validation: i) unconventional pairing in attractively interacting fermionic mixtures, ii) fermionic systems subjected to the artificial spin‐orbit coupling, iii) fermionic gases of atoms with high SU(N) symmetry of internal states.

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Raman-Induced Interactions in a Single-Component Fermi Gas Near ans-Wave Feshbach Resonance

Cited by 161 publications

References 42 publications

Casting New Light on Atomic Interactions

Casting New Light on Atomic Interactions

Harmonically trapped two-atom systems: Interplay of short-ranges-wave interaction and spin-orbit coupling

Simulating Artificial 1D Physics with Ultra‐Cold Fermionic Atoms: Three Exemplary Themes

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