The bosonic skin effect: Boundary condensation in asymmetric transport
Louis Garbe, Yuri Minoguchi, Julian Huber, Peter Rabl
SciPost Phys. 16, 029 (2024) · published 25 January 2024
- doi: 10.21468/SciPostPhys.16.1.029
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Abstract
We study the incoherent transport of bosonic particles through a one dimensional lattice with different left and right hopping rates, as modelled by the asymmetric simple inclusion process (ASIP). Specifically, we show that as the current passing through this system increases, a transition occurs, which is signified by the appearance of a characteristic zigzag pattern in the stationary density profile near the boundary. In this highly unusual transport phase, the local particle distribution alternates on every site between a thermal distribution and a Bose-condensed state with broken $U(1)$-symmetry. Furthermore, we show that the onset of this phase is closely related to the so-called non-Hermitian skin effect and coincides with an exceptional point in the spectrum of density fluctuations. Therefore, this effect establishes a direct connection between quantum transport, non-equilibrium condensation phenomena and non-Hermitian topology, which can be probed in cold-atom experiments or in systems with long-lived photonic, polaritonic and plasmonic excitations.
Cited by 7
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 Louis Garbe,
- 1 Yuri Minoguchi,
- 1 Julian Huber,
- 1 2 3 4 Peter Rabl
- 1 Vienna Center for Quantum Science and Technology [VCQ]
- 2 Technische Universität München / Technical University of Munich [TUM]
- 3 Munich Center for Quantum Science and Technology [MCQST]
- 4 Walther-Meißner-Institut
- Austrian Science Fund (FWF) (through Organization: Fonds zur Förderung der wissenschaftlichen Forschung / FWF Austrian Science Fund [FWF])
- Horizon 2020 (through Organization: European Commission [EC])