Hydrodynamic effects of ballistic electron jets in high-mobility GaAs/AlGaAs

ORAL

Abstract

The influence of a ballistic electron jet, injected through a lithographic aperture,
is experimentally investigated through nonlocal resistance measurements over a distance L
from the injection point, in a 2D electron system in a high-mobility GaAs/AlGaAs
heterostructure over a temperature range 4 K < T < 40 K, at zero magnetic field. The geometry
consists of various mesoscopic apertures separated by L ranging from 1.3 μm to 20.5 μm such
that the jet can be injected from any aperture and the nonlocal potential induced by the
current distribution can be measured at any other aperture. The measured nonlocal resistance
exhibits a non-monotonic behavior as T is increased, leading to negative values (up to L = 12.8
μm) in an intermediate T range. This T range lies in the hydrodynamic regime of transport
where electron-electron interactions can lead to momentum exchange between the ballistic jet
and the surrounding electron fluid, resulting in a depletion of electrons in vicinity of the main
jet and extraction of electrons from the nearby detector aperture. The experimental results are
compared to the predictions of theoretical models based on Boltzmann transport equations.

*DOE DE-FG02-08ER46532, DOE DE-SC0020138

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Presenters

  • Adbhut Gupta

    • Virginia Tech

Authors

  • Adbhut Gupta

    • Virginia Tech

  • Jean J Heremans

    • Virginia Tech

  • Saeed Fallahi

    • Physics and Astronomy, Purdue University
    • Purdue University
    • Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Physics, Purdue University

  • Geoff C Gardner

    • Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum Purdue
    • Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Physics, Purdue University

  • Michael Manfra

    • Physics and Astronomy, Purdue Univ
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, School of Materials Engineering, School of Electrical and Computer Engineering, Purdue
    • Purdue Univ
    • Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Department of Physics and Astronomy, Birck Nanotechnology Center, Microsoft Quantum Purdue, School og Materials Engineering & School of Electrical and Computer Engineering, P
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy, PURDUE UNIVERSITY
    • Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Physics, Purdue University