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Title: Mode-selected heat flow through a one-dimensional waveguide network

Cross-correlated measurements of thermal noise are performed to determine the electron temperature in nanopatterned channels of a GaAs/AlGaAs heterostructure at 4.2 K. Two-dimensional (2D) electron reservoirs are connected via an extended one-dimensional (1D) electron waveguide network. Hot electrons are produced using a current I{sub h} in a source 2D reservoir, are transmitted through the ballistic 1D waveguide, and relax in a drain 2D reservoir. We find that the electron temperature increase, ΔT{sub e}, in the drain is proportional to the square of the heating current I{sub h}, as expected from Joule's law. No temperature increase is observed in the drain when the 1D waveguide does not transmit electrons. Therefore, we conclude that electron-phonon interaction is negligible for heat transport between 2D reservoirs at temperatures below 4.2 K. Furthermore, mode control of the 1D electron waveguide by application of a top-gate voltage reveals that ΔT{sub e} is not proportional to the number of populated subbands N, as previously observed in single 1D conductors. This can be explained with the splitting of the heat flow in the 1D waveguide network.
Authors:
; ; ; ;  [1] ;  [2] ;  [2] ;  [3]
  1. Novel Materials Group, Humboldt-Universität zu Berlin, 12489 Berlin (Germany)
  2. Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum (Germany)
  3. (Germany)
Publication Date:
OSTI Identifier:
22412714
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM ARSENIDES; ELECTRIC POTENTIAL; ELECTRON TEMPERATURE; ELECTRON-PHONON COUPLING; ELECTRONS; GALLIUM ARSENIDES; HEAT FLUX; HEAT TRANSFER; HEATING; HETEROJUNCTIONS; MODE CONTROL; ONE-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL SYSTEMS