Mesoscopic transport signatures of disorder-induced non-Hermitian phases
- URL: http://arxiv.org/abs/2201.05616v2
- Date: Mon, 2 May 2022 10:32:47 GMT
- Title: Mesoscopic transport signatures of disorder-induced non-Hermitian phases
- Authors: Benjamin Michen, Jan Carl Budich
- Abstract summary: We investigate the impact on basic quantum transport properties of disorder-induced exceptional points (EPs) that emerge in a disorder-averaged Green's function description of two-dimensional (2D) Dirac semimetals.
We find that EPs may promote the nearly vanishing conductance of a finite sample at the Dirac point to a sizable value that increases with disorder strength.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We investigate the impact on basic quantum transport properties of
disorder-induced exceptional points (EPs) that emerge in a disorder-averaged
Green's function description of two-dimensional (2D) Dirac semimetals with
spin- or orbital-dependent potential scattering. Remarkably, we find that EPs
may promote the nearly vanishing conductance of a finite sample at the Dirac
point to a sizable value that increases with disorder strength. This striking
behavior exhibits a strong directional anisotropy that is closely related to
the Fermi arcs connecting the EPs. We corroborate our results by numerically
exact simulations, thus revealing the fingerprints of characteristic
non-Hermitian spectral features also on the localization properties of the
considered systems. Finally, several candidates for the experimental
verification of our theoretical analysis are discussed, including disordered
electronic square-net materials and cold atoms in spin-dependent optical
lattices.
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