Hydrodynamic and Ballistic Transport over Large Length Scales in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>GaAs</mml:mi><mml:mo>/</mml:mo><mml:mi>AlGaAs</mml:mi></mml:mrow></mml:math>
Adbhut Gupta, J. J. Heremans, Gitansh Kataria, Mani Chandra, Saeed Fallahi, Geoffrey C. Gardner, Michael J. Manfra
Abstract
We study hydrodynamic and ballistic transport regimes through nonlocal resistance measurements and high-resolution kinetic simulations in a mesoscopic structure on a high-mobility two-dimensional electron system in a GaAs/AlGaAs heterostructure. We evince the existence of collective transport phenomena in both regimes and demonstrate that negative nonlocal resistances and current vortices are not exclusive to only the hydrodynamic regime. The combined experiments and simulations highlight the importance of device design, measurement schemes, and one-to-one modeling of experimental devices to demarcate various transport regimes.
Topics & Concepts
Mesoscopic physicsPhysicsStatistical physicsCondensed matter physicsQuantum and electron transport phenomenaAdvancements in Semiconductor Devices and Circuit DesignSemiconductor Quantum Structures and Devices