Fundamental dissipation due to bound fermions in the zero-temperature limit.

Fundamental dissipation due to bound fermions in the zero-temperature limit.
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DOI:
10.1038/s41467-020-18499-1
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发表时间:
2020-09-21
影响因子:
16.6
通讯作者:
Zmeev DE
Zmeev DE
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Autti S;Ahlstrom SL;Haley RP;Jennings A;Pickett GR;Poole M;Schanen R;Soldatov AA;Tsepelin V;Vonka J;Wilcox T;Woods AJ;Zmeev DE

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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. Understanding dynamics of fermionic bound states is important for their potential application in quantum devices. Here the authors study zero temperature dynamics and dissipation of fermions bound on a moving goal-post shaped wire in superfluid 3He-B.
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