TY - JOUR
AU - Lindsay Sonderhouse
AU - Christian Sanner
AU - Ross Hutson
AU - Akihisa Goban
AU - Thomas Bilitewski
AU - Lingfeng Yan
AU - William Milner
AU - Ana Maria Rey
AU - Jun Ye
AB - Many-body quantum systems can exhibit a striking degree of symmetry unparalleled by their classical counterparts. While in real materials SU(N) symmetry is an idealization, this symmetry is pristinely realized in fully controllable ultracold alkaline-earth atomic gases. Here, we study an SU(N)-symmetric Fermi liquid of 87Sr atoms, where N can be tuned to be as large as 10. In the deeply degenerate regime, we show through precise measurements of density fluctuations and expansion dynamics that the large N of spin states under SU(N) symmetry leads to pronounced interaction effects in a system with a nominally negligible interaction parameter. Accounting for these effects we demonstrate thermometry accurate to one-hundredth of the Fermi energy. We also demonstrate record speed for preparing degenerate Fermi seas, reaching T/TF=0.12 in under 3 s, enabled by the SU(N) symmetric interactions. This, along with the introduction of a new spin polarizing method, enables operation of a 3D optical lattice clock in the band insulating-regime.
BT - Nature Physics
DA - 2020-08
DO - 10.1038/s41567-020-0986-6
IS - 12
N2 - Many-body quantum systems can exhibit a striking degree of symmetry unparalleled by their classical counterparts. While in real materials SU(N) symmetry is an idealization, this symmetry is pristinely realized in fully controllable ultracold alkaline-earth atomic gases. Here, we study an SU(N)-symmetric Fermi liquid of 87Sr atoms, where N can be tuned to be as large as 10. In the deeply degenerate regime, we show through precise measurements of density fluctuations and expansion dynamics that the large N of spin states under SU(N) symmetry leads to pronounced interaction effects in a system with a nominally negligible interaction parameter. Accounting for these effects we demonstrate thermometry accurate to one-hundredth of the Fermi energy. We also demonstrate record speed for preparing degenerate Fermi seas, reaching T/TF=0.12 in under 3 s, enabled by the SU(N) symmetric interactions. This, along with the introduction of a new spin polarizing method, enables operation of a 3D optical lattice clock in the band insulating-regime.
PY - 2020
SE - 1216
EP - 1216
T2 - Nature Physics
TI - Thermodynamics of a deeply degenerate SU(N)-symmetric Fermi gas
UR - https://www.nature.com/articles/s41567-020-0986-6
VL - 16
ER -