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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Fundamental dissipation due to bound fermions in the zero-temperature limit
AU - Autti, Samuli
AU - Ahlstrom, Sean
AU - Haley, Richard
AU - Jennings, Ash
AU - Pickett, George
AU - Poole, Malcolm
AU - Schanen, Roch
AU - Soldatov, A. A.
AU - Tsepelin, Viktor
AU - Vonka, Jakub
AU - Wilcox, Tom
AU - Woods, Andrew
AU - Zmeev, Dmitry
PY - 2020/9/21
Y1 - 2020/9/21
N2 - The ground state of a fermionic condensate is well protected against perturbations in the presence of an isotropic gap. Regions of gap suppression, surfaces and vortex cores which host Andreev-bound states, seemingly lift that strict protection. Here we show that in superfluid 3He the role of bound states is more subtle: when a macroscopic object moves in the superfluid at velocities exceeding the Landau critical velocity, little to no bulk pair breaking takes place, while the damping observed originates from the bound states covering the moving object. We identify two separate timescales that govern the bound state dynamics, one of them much longer than theoretically anticipated, and show that the bound states do not interact with bulk excitations.
AB - The ground state of a fermionic condensate is well protected against perturbations in the presence of an isotropic gap. Regions of gap suppression, surfaces and vortex cores which host Andreev-bound states, seemingly lift that strict protection. Here we show that in superfluid 3He the role of bound states is more subtle: when a macroscopic object moves in the superfluid at velocities exceeding the Landau critical velocity, little to no bulk pair breaking takes place, while the damping observed originates from the bound states covering the moving object. We identify two separate timescales that govern the bound state dynamics, one of them much longer than theoretically anticipated, and show that the bound states do not interact with bulk excitations.
U2 - 10.1038/s41467-020-18499-1
DO - 10.1038/s41467-020-18499-1
M3 - Journal article
VL - 11
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 4742
ER -