Combination of a magnetic Feshbach resonance and an optical bound-to-bound transition

Bauer, Dominik; Lettner, Matthias; Vo, Christoph; Rempe, Gerhard; Dürr, Stephan

doi:10.1103/physreva.79.062713

Cited by 39 publications

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“…[3,27]. We proposed a realization of this model in cold atom experiments using spatially resolved optical Feshbach resonances [42,43]. In this model, many-body localization follows from fragmentation of particles into slow and fast species (doublons and singlons), which is a result of the strong interactions.…”

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confidence: 99%

“…Optical Feshbach resonances are known to incur excess heating due to spontaneous emission from the excited state, and that could be detrimental for realizing many-body localization. To mitigate this effect, we suggest to use a scheme in which the light couples the bound Feshbach molecular state to an excited molecular state off-resonantly [42,43]. Using this scheme the heating time can be as long as 10ms [44], which is about 50t −1 h [9].…”

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confidence: 99%

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Many-body localization in system with a completely delocalized single-particle spectrum

2016

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Many-body localization (MBL) in a one-dimensional Fermi Hubbard model with random on-site interactions is studied. While for this model all single-particle states are trivially delocalized, it is shown that for sufficiently strong disordered interactions the model is many-body localized. It is therefore argued that MBL does not necessary rely on localization of the single-particle spectrum. This model provides a convenient platform to study pure MBL phenomenology, since Anderson localization in this model does not exist. By examining various forms of the interaction term a dramatic effect of symmetries on charge transport is demonstrated. A possible realization in a cold atom experiments is proposed. Introduction.-It has been known for almost 60 years that non-interacting particles in one-dimensional disordered systems exhibit Anderson localization [1]. Transport in these systems is exponentially suppressed with the system size, and without coupling to the environment, these systems are non-ergodic at any temperature. Anderson localized systems are, however, non-generic, since they do not include interactions which allow for the exchange of energy. For many years it was assumed that interactions generally restore ergodicity and destroy localization [2]. A decade ago, using non-equilibrium diagrammatic techniques, it was argued that Anderson localization is stable under the addition of a small shortranged interactions [3], a phenomenon currently known as many-body localization (MBL). Many-body localized systems are the only known generic non-ergodic systems which do not follow the assumptions of statistical mechanics [4][5][6]. While the realization of MBL systems presents challenges in condensed matter systems due to inevitable presence of phonons [7,8], recent experiments in cold atoms have provided evidence of the existence of MBL in both one-dimensional [9-11] and two-dimensional systems [12].

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confidence: 99%

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confidence: 99%

Many-body localization in system with a completely delocalized single-particle spectrum

2016

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“…At the intensity I ¼ 225 W=cm 2 used for most of this work, we estimate that the residual dipole potential k B × 1 nK is negligible compared to our typical chemical potential of k B × 10 nK, where k B is the Boltzmann constant. With uniform exposure to this intensity, the loss induced by OFR is well explained by a one-body decay with a time constant of 0.63 (2) 26], which is limited by two-body loss. After scaling their result to the density of our gas and the same change in scattering length, we find that our scheme provides more than an order of magnitude improvement in the lifetime.…”

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confidence: 95%

“…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%

“…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.…”

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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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Probing Non-Equilibrium Dynamics in Two-Dimensional Quantum Gases

Chen

2022

Springer Theses

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Combination of a magnetic Feshbach resonance and an optical bound-to-bound transition

Cited by 39 publications

References 38 publications

Many-body localization in system with a completely delocalized single-particle spectrum

Many-body localization in system with a completely delocalized single-particle spectrum

Casting New Light on Atomic Interactions

Probing Non-Equilibrium Dynamics in Two-Dimensional Quantum Gases

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