Chiatti, O;
Nicholls, JT;
Proskuryakov, YY;
Lumpkin, N;
Farrer, I;
Ritchie, DA;
(2007)
Quantum thermal conductance of electrons in a one-dimensional wire.
Presented at: DPG Spring Meeting 2007, Universitaet Regensburg, Regensburg, Germany.
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Abstract
We use an electron thermometer to measure the temperature rise of approximately 2×10(5) electrons in a two-dimensional box, due to heat flow into the box through a ballistic one-dimensional (1D) constriction. Using a simple model we deduce the thermal conductance κ(Vg) of the 1D constriction, which we compare to its electrical conductance characteristics; for the first four 1D subbands the heat carried by the electrons passing through the wire is proportional to its electrical conductance G(Vg). In the vicinity of the 0.7 structure this proportionality breaks down, and a plateau at the quantum of thermal conductance ~π²k(B)²T/3h is observed.
| Type: | Poster |
|---|---|
| Title: | Quantum thermal conductance of electrons in a one-dimensional wire |
| Event: | DPG Spring Meeting 2007 |
| Location: | Universitaet Regensburg, Regensburg, Germany |
| Dates: | 26 - 30 March 2007 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | http://regensburg07.dpg-tagungen.de/index.html?lan... |
| Language: | English |
| Keywords: | Ballistic conductor, GaAs/AlGaAs heterostructure, Low-temperature transport, Low-dimensional electron system, One-dimensional conductor, Thermal conductance, Thermoelectric effects, Two-dimensional electron gas, Wiedemann-Franz law |
| UCL classification: | UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/20503 |
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