TY - JOUR
T1 - Superdiffusive nonequilibrium motion of an impurity in a Fermi sea
AU - Kim, Hyungwon
AU - Huse, David A.
PY - 2012/4/6
Y1 - 2012/4/6
N2 - We treat the nonequilibrium motion of a single-impurity atom in a low-temperature single-species Fermi sea, interacting via a contact interaction. In the nonequilibrium regime, the impurity does a superdiffusive geometric random walk where the typical distance traveled grows with time as ∼td /(d +1 ) for the d-dimensional system with d2. For nonzero temperature T, this crosses over to diffusive motion at long times with diffusivity D∼T -(d -1 )/2. These results apply also to a nonzero concentration of impurity atoms as long as they remain dilute and nondegenerate.
AB - We treat the nonequilibrium motion of a single-impurity atom in a low-temperature single-species Fermi sea, interacting via a contact interaction. In the nonequilibrium regime, the impurity does a superdiffusive geometric random walk where the typical distance traveled grows with time as ∼td /(d +1 ) for the d-dimensional system with d2. For nonzero temperature T, this crosses over to diffusive motion at long times with diffusivity D∼T -(d -1 )/2. These results apply also to a nonzero concentration of impurity atoms as long as they remain dilute and nondegenerate.
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U2 - 10.1103/PhysRevA.85.043603
DO - 10.1103/PhysRevA.85.043603
M3 - Article
AN - SCOPUS:84859793007
SN - 1050-2947
VL - 85
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 4
M1 - 043603
ER -