Characterising transport in a quantum gas by measuring Drude weights
arXiv:2406.17569 · doi:10.1126/science.ads8327
Abstract
Transport properties play a crucial role in defining materials as insulators, metals, or superconductors. A fundamental parameter in this regard is the Drude weight, which quantify the ballistic transport of charge carriers. In this work, we measure the Drude weights of an ultracold gas of interacting bosonic atoms confined to one dimension, characterising the induced atomic and energy currents in response to perturbations with an external potential. We induce currents through two distinct experimental protocols; by applying a constant force to the gas, and by joining two subsystems prepared in different equilibrium states. By virtue of integrability, dynamics of the system is governed by ballistically propagating, long-lived quasi-particle excitations, whereby Drude weights almost fully characterise large-scale transport. Indeed, our results align with predictions from a recently developed hydrodynamic theory, demonstrating almost fully dissipationless transport, even at finite temperatures and interactions. These findings not only provide experimental validation of the hydrodynamic predictions but also offer methodologies applicable to various condensed matter systems, facilitating further studies on the transport properties of strongly correlated quantum matter.
arXiv comment10 pages, 6 figures. Comments are welcome
References in corpus (38)
- Atomic Scattering in Presence of an External Confinement and a Gas of Impenetrable Bosons
- Transport in Out-of-Equilibrium XXZ Chains: Exact Profiles of Charges and Currents
- Effective wave-equations for the dynamics of cigar-shaped and disc-shaped Bose condensates
- Emergent hydrodynamics in integrable quantum systems out of equilibrium
- Drude Conductivity of Dirac Fermions in Graphene
- Dispersive shock waves and modulation theory
- Generalized HydroDynamics on an Atom Chip
- Hydrodynamic Diffusion in Integrable Systems
- Conduction of Ultracold Fermions Through a Mesoscopic Channel
- Hydrodynamics of operator spreading and quasiparticle diffusion in interacting integrable systems
- Bethe-Boltzmann Hydrodynamics and Spin Transport in the XXZ Chain
- Pair correlations in a finite-temperature 1D Bose gas
- Integrability and ideal conductance at finite temperatures
- Microscopic origin of ideal conductivity in integrable quantum models
- Generalized hydrodynamics in strongly interacting 1D Bose gases
- A note on generalized hydrodynamics: inhomogeneous fields and other concepts
- Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets
- Semiconducting-to-metallic photoconductivity crossover and temperature-dependent Drude weight in graphene
- Drude Weight for the Lieb-Liniger Bose Gas
- Evidence for ideal insulating/conducting state in a 1D integrable system
- Connecting strongly correlated superfluids by a quantum point contact
- Diffusive hydrodynamics from integrability breaking
- Correlation functions and transport coefficients in generalised hydrodynamics
- Two-point density correlations of quasicondensates in free expansion
- Extension of the Generalized Hydrodynamics to the Dimensional Crossover Regime
- Thermodyamic bounds on Drude weights in terms of almost-conserved quantities
- Designing Arbitrary One-dimensional Potentials on an Atom Chip
- Generalized hydrodynamics: a perspective
- Emergent Pauli blocking in a weakly interacting Bose gas
- Introducing iFluid: a numerical framework for solving hydrodynamical equations in integrable models
- Rapidity and momentum distributions of 1D dipolar quantum gases
- Probing the local rapidity distribution of a 1D Bose gas
- The dissipative Generalized Hydrodynamic equations and their numerical solution
- The Whitham Approach to the limit of The Lieb-Liniger Model and Generalized Hydrodynamics
- The Whitham approach to Generalized Hydrodynamics
- Benchmarks of Generalized Hydrodynamics for 1D Bose Gases
- Identifying diffusive length scales in one-dimensional Bose gases
- Quantum fluctuating theory for one-dimensional shock waves