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Dissipation-enabled hydrodynamic conductivity in a tunable bandgap semiconductor
- Source :
- Science Advances Volume 8, Issue 15 (2022)
- Publication Year :
- 2019
-
Abstract
- Electronic transport in the regime where carrier-carrier collisions are the dominant scattering mechanism has taken on new relevance with the advent of ultraclean two-dimensional materials. Here we present a combined theoretical and experimental study of ambipolar hydrodynamic transport in bilayer graphene demonstrating that the conductivity is given by the sum of two Drude-like terms that describe relative motion between electrons and holes, and the collective motion of the electron-hole plasma. As predicted, the measured conductivity of gapless, charge-neutral bilayer graphene is sample- and temperature-independent over a wide range. Away from neutrality, the electron-hole conductivity collapses to a single curve, and a set of just four fitting parameters provides quantitative agreement between theory and experiment at all densities, temperatures, and gaps measured. This work validates recent theories for dissipation-enabled hydrodynamic conductivity and creates a link between semiconductor physics and the emerging field of viscous electronics.<br />Comment: Completely rewritten. Accepted for publication in Science Advances. 63 pages, 20 figures
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Science Advances Volume 8, Issue 15 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.1908.10921
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1126/sciadv.abi8481