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Title: Spin-energy correlation in degenerate weakly interacting Fermi gases

Journal Article · · Physical Review A
 [1];  [1];  [1];  [1]
  1. North Carolina State Univ., Raleigh, NC (United States)
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Weakly interacting Fermi gases exhibit rich collective dynamics in spin-dependent potentials, arising from correlations between spin degrees of freedom and conserved single-atom energies, offering broad prospects for simulating many-body quantum systems by engineering energy-space “lattices,” with controlled energy landscapes and site-to-site interactions. Using quantum-degenerate clouds of 6Li, confined in a spin-dependent harmonic potential, we measure complex, time-dependent spin-density profiles, varying on length scales much smaller than the cloud size. We demonstrate that a one-dimensional mean-field model, without additional simplifying approximations, quantitatively predicts the observed fine structure. We calculate the magnetic fields where the scattering lengths vanish for three different hyperfine state mixtures to provide constraints on the collisional (Feshbach) resonance parameters.

Research Organization:
North Carolina State University, Raleigh, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
Grant/Contract Number:
SC0008646; PHY-1705364; FA9550-16-1-0378
OSTI ID:
1527134
Alternate ID(s):
OSTI ID: 1546255; OSTI ID: 1573318
Journal Information:
Physical Review A, Vol. 99, Issue 6; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

References (24)

Observation of the Leggett-Rice Effect in a Unitary Fermi Gas journal January 2015
Transverse Demagnetization Dynamics of a Unitary Fermi Gas journal May 2014
Anomalous Minimum in the Shear Viscosity of a Fermi Gas journal July 2014
Dynamics of Interacting Fermions in Spin-Dependent Potentials journal November 2016
Spin Self-Rephasing and Very Long Coherence Times in a Trapped Atomic Ensemble journal July 2010
Observation of Anomalous Spin-State Segregation in a Trapped Ultracold Vapor journal January 2002
Observation of a Strongly Interacting Degenerate Fermi Gas of Atoms journal November 2002
Observation of Anomalous Spin Segregation in a Trapped Fermi Gas journal October 2008
Precise Characterization of Li 6 Feshbach Resonances Using Trap-Sideband-Resolved RF Spectroscopy of Weakly Bound Molecules journal March 2013
Unitarity-limited elastic collision rate in a harmonically trapped Fermi gas journal July 2003
Spin Current Cross-Correlations as a Probe of Magnon Coherence journal May 2019
Controlling Spin Current in a Trapped Fermi Gas journal July 2009
Universal spin dynamics in two-dimensional Fermi gases journal May 2013
Universal Thermodynamics of Degenerate Quantum Gases in the Unitarity Limit journal March 2004
Internal State Conversion in Ultracold Gases journal May 2002
Internal Waves and Synchronized Precession in a Cold Vapor journal May 2002
Spin segregation via dynamically induced long-range interactions in a system of ultracold fermions journal December 2011
Quantum simulations with ultracold quantum gases journal April 2012
Revealing the Superfluid Lambda Transition in the Universal Thermodynamics of a Unitary Fermi Gas journal January 2012
Longitudinal Spin Waves in a Dilute Bose Gas journal May 2002
Precise Determination of Li 6 Cold Collision Parameters by Radio-Frequency Spectroscopy on Weakly Bound Molecules journal March 2005
Cumulative Identical Spin Rotation Effects in Collisionless Trapped Atomic Gases journal May 2009
Anomalous spin segregation in a weakly interacting two-component Fermi gas journal May 2009
P -wave Feshbach resonances of ultracold Li 6 journal September 2004

Figures / Tables (14)

FIG. 1(p. 2)figure FIG. 1
FIG. 2(p. 3)figure FIG. 2
FIG. 3(p. 3)figure FIG. 3
FIG. 4(p. 4)figure FIG. 4
FIG. 5(p. 4)figure FIG. 5
FIG. 6(p. 5)figure FIG. 6
Fig. 7(p. 5)figure Fig. 7
Fig. 8(p. 5)figure Fig. 8
TABLE I(p. 5)table TABLE I
FIG. 9(p. 6)figure FIG. 9
FIG. 10(p. 7)figure FIG. 10
FIG. 11(p. 8)figure FIG. 11
FIG. 12(p. 8)figure FIG. 12
FIG. 13(p. 15)figure FIG. 13

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Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
Fermi gases
Weakly interacting
Fermi gas
lattices
spin-waves