Symmetry protected long-lived excitations and tomographic dynamics in 2D electron fluids
ORAL
Abstract
We will discuss the peculiar collective behavior in two-dimensional Fermi gases arising from head-on carrier-carrier collisions. These collisions dominate at cold temperatures, T << TF, due to the combined effects of Pauli blocking and momentum conservation. Odd-parity harmonics are protected from these collisions and hence have anomalously long lifetimes. They instead slowly relax via small angle scattering which leads to a strange "superdiffusive" behavior. These long-lived modes give rise to a "tomographic" transport regime dominated by fermionic jets with an unusual hierarchy of time scales and scale-dependent transport coefficients with nontrivial fractional scaling dimensions. We will also discuss proposals for experimental realizations and implications for ongoing studies of electron hydrodynamics.
References:
P. J. Ledwith, H. Guo, A. Shytov, and L. Levitov, Phys. Rev. Lett. 123, 116601 (2019).
P. J. Ledwith, H. Guo, and L. Levitov, Annals of Physics 411, 167913 (2019).
P. J. Ledwith, H. Guo, and L. Levitov, (2019), arXiv:1708.01915.
L. H. Kendrick, P. J. Ledwith, A. Shytov, and L. Levitov, (2018), arXiv:1810.07588.
References:
P. J. Ledwith, H. Guo, A. Shytov, and L. Levitov, Phys. Rev. Lett. 123, 116601 (2019).
P. J. Ledwith, H. Guo, and L. Levitov, Annals of Physics 411, 167913 (2019).
P. J. Ledwith, H. Guo, and L. Levitov, (2019), arXiv:1708.01915.
L. H. Kendrick, P. J. Ledwith, A. Shytov, and L. Levitov, (2018), arXiv:1810.07588.
*Patrick Ledwith was supported by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate (NDSEG) Fellowship Program.
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Presenters
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Patrick Ledwith
- Harvard University