Noise thermometry in narrow two-dimensional electron gas heat baths connected to a quasi-one-dimensional interferometer | |
Article | |
关键词: ENERGY-LOSS RATES; PHONON-SCATTERING; QUANTUM WIRES; HOT-ELECTRONS; RELAXATION; TRANSPORT; THERMOPOWER; OSCILLATIONS; TEMPERATURES; REDUCTION; | |
DOI : 10.1103/PhysRevB.85.235301 | |
来源: SCIE |
【 摘 要 】
Thermal voltage noise measurements are performed in order to determine the electron temperature in nanopatterned channels of a GaAs/AlGaAs heterostructure at bath temperatures of 4.2 and 1.4 K. Two narrow two-dimensional (2D) heating channels are connected by a quasi-1D quantum interferometer. Under dc current heating of the electrons in one heating channel, we perform cross-correlated noise measurements locally in the directly heated channel and nonlocally in the other channel, which is indirectly heated by hot electron diffusion across the quasi-1D connection. The temperature dependence of the electron energy-loss rate is reduced compared to wider 2D systems. Under nonlocal current heating, which establishes a thermal gradient across the quantum interferometer, we show the decoherence in this structure by Aharonov-Bohm measurements.
【 授权许可】
Free