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Determining energy relaxation length scales in two-dimensional electron gases | | Jordan Billiald
; Dirk Backes
; Jürgen König
; Ian Farrer
; David Ritchie
; Vijay Narayan
; | | Date: |
24 Apr 2015 | | Abstract: | We present measurements of the energy relaxation length scale $ell$ in
two-dimensional electron gases (2DEGs). We establish a temperature gradient in
the 2DEG by means of a heating current and then estimate the elevated electron
temperature $T_e$ by monitoring the resultant thermovoltage between a pair of
differentially biased bar-gates. We adopt a model by Rojek et al. [1] to
analyse the thermovoltage signal and as a result extract $ell$, $T_e$ and the
power-law exponent $alpha_i$ for inelastic scattering events in the 2DEG. We
show that in high-mobility 2DEGs, $ell$ can attain macroscopic values of
several 100 $mu$m, but decreases rapidly as the carrier density $n$ is
decreased. Our work demonstrates a versatile low-temperature thermometry
scheme, and the results provide crucial insights into heat transport mechanisms
in low-dimensional systems and nanostructures. These, in turn, will be vital
towards practical design considerations for nanoelectronic circuits [2]. | | Source: | arXiv, 1504.6524 | | Services: | Forum | Review | PDF | Favorites | |
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