Dynamics of spin and density fluctuations in strongly interacting few-body systems

Barfknecht, R. E.; Foerster, Angela; Zinner, N. T.

doi:10.1038/s41598-019-52392-2

Cited by 17 publications

(6 citation statements)

References 71 publications

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“…To overcome these limitations, starting from the pioneering works by Recati et al [12,13], many real-time protocols have been proposed to probe SCS with cold atoms [12][13][14][15][16]. Several experiments implemented these ideas in the last few years [17][18][19][20][21][22], but the field is still at an early stage.…”

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confidence: 99%

Real-time spin-charge separation in one-dimensional Fermi gases from generalized hydrodynamics

2021

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We revisit early suggestions to observe spin-charge separation in cold-atom settings in the time domain by studying one-dimensional repulsive Fermi gases in a harmonic potential, where pulse perturbations are initially created at the center of the trap. We analyze the subsequent evolution using Generalized Hydrodynamics (GHD), which provides an exact description, at large space-time scales, for arbitrary temperature T , particle density, and interactions. At T = 0 and vanishing magnetic field, we find that, after a non-trivial transient regime, spin and charge dynamically decouple up to perturbatively small corrections which we quantify. In this limit, our results can be understood based on a simple phase-space hydrodynamic picture. At finite temperature, we solve numerically the GHD equations, showing that for low T > 0 effects of spin-charge separation survive, and characterize explicitly the value of T for which the two distinguishable excitations melt.

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confidence: 99%

Real-time spin-charge separation in one-dimensional Fermi gases from generalized hydrodynamics

2021

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“…This allows us to consider spin dynamics in mesoscopic samples with a fixed density (cf. [35][36][37]).…”

Section: Systemmentioning

confidence: 99%

Generation of spin currents by a temperature gradient in a two-terminal device

Barfknecht,

Foerster,

Zinner

et al. 2021

Preprint

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Theoretical and experimental investigations of the interaction between spins and temperature gradients are vital for the development of spin caloritronics, and can dictate the design of future spintronics devices. In this work, we propose a two-terminal cold-atom simulator to study that interaction. The proposed quantum simulator consists of strongly interacting atoms that occupy two reservoirs connected by a one-dimensional link. The reservoirs are kept at different temperatures. We show the existence of a spin current in this system by studying the dynamics that follows a spin-flip of an atom in the link. We argue that the dynamics in the link can be described using an inhomogeneous Heisenberg chain whose couplings are defined by the local temperature. A temperature gradient accelerates the impurity in one direction more than in the other, leading to an overall spin current. Therefore, our study offers a way to simulate certain features of the spin Seebeck effect with cold atoms.

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“…Our results are a useful contribution to the understanding of the emergent behaviour of quantum systems and the bridging of the gap between single and many-body states. The framework presented is also well suited to investigate these systems' dynamical properties [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Spin–orbit coupling in the presence of strong atomic correlations

et al. 2020

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We explore the influence of contact interactions on a synthetically spin-orbit coupled system of two ultracold trapped atoms. Even though the system we consider is bosonic, we show that a regime exists in which the competition between the contact and spin-orbit interactions results in the emergence of a ground state that contains a significant contribution from the anti-symmetric spin state. This ground state is unique to few-particle systems and does not exist in the mean-field regime. The transition to this state is signalled by an inversion in the average momentum from being dominated by centre-ofmass momentum to relative momentum and also affects the global entanglement shared between the real-and pseudo-spin spaces. Indeed, competition between the interactions can also result in avoided crossings in the ground state which further enhances these correlations. However, we find that correlations shared between the pseudo-spin states are strongly depressed due to the spin-orbit coupling and therefore the system does not contain spin-spin entanglement.

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Dynamics of spin and density fluctuations in strongly interacting few-body systems

Cited by 17 publications

References 71 publications

Real-time spin-charge separation in one-dimensional Fermi gases from generalized hydrodynamics

Real-time spin-charge separation in one-dimensional Fermi gases from generalized hydrodynamics

Generation of spin currents by a temperature gradient in a two-terminal device

Spin–orbit coupling in the presence of strong atomic correlations

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