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Transverse Demagnetization Dynamics of a Unitary Fermi Gas

by Beattie, S. , Fine, D. , Cheng, N. S. , Zhang, S. , Luciuk, C. , Thywissen, J. H. , Bardon, A. B. , Taylor, E. , Trotzky, S. , Edge, G. J. A. , Cairncross, W.

in Atomic interactions / Calibration / chemical elements / Degenerate matter / Demagnetization / Diffusion coefficient / diffusivity / Errors in statistics / gases / High temperature / Low temperature / Magnetic fields / Magnetization / Particle physics / Strong nuclear force / Temperature gradients / Thermodynamics

2014

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Transverse Demagnetization Dynamics of a Unitary Fermi Gas

by Beattie, S. , Fine, D. , Cheng, N. S. , Zhang, S. , Luciuk, C. , Thywissen, J. H. , Bardon, A. B. , Taylor, E. , Trotzky, S. , Edge, G. J. A. , Cairncross, W.

2014

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Transverse Demagnetization Dynamics of a Unitary Fermi Gas

by Beattie, S. , Fine, D. , Cheng, N. S. , Zhang, S. , Luciuk, C. , Thywissen, J. H. , Bardon, A. B. , Taylor, E. , Trotzky, S. , Edge, G. J. A. , Cairncross, W.

2014

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Journal Article

Transverse Demagnetization Dynamics of a Unitary Fermi Gas

Beattie, S.,

Fine, D.,

Cheng, N. S.,

Zhang, S.,

Luciuk, C.,

Thywissen, J. H.,

Bardon, A. B.,

Taylor, E.,

Trotzky, S.,

Edge, G. J. A.,

Cairncross, W.

2014

Overview

Understanding the quantum dynamics of strongly interacting fermions is a problem relevant to diverse forms of matter, including high-temperature superconductors, neutron stars, and quark-gluon plasma. An appealing benchmark is offered by cold atomic gases in the unitary limit of strong interactions. Here, we study the dynamics of a transversely magnetized unitary Fermi gas in an inhomogeneous magnetic field. We observe the demagnetization of the gas, caused by diffusive spin transport. At low temperatures, the diffusion constant saturates to the conjectured quantum-mechanical lower bound ≃ ħ/m, where m is the particle mass. The development of pair correlations, indicating the transformation of the initially noninteracting gas toward a unitary spin mixture, is observed by measuring Tan's contact parameter.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

/ Diffusion coefficient

/ diffusivity