B Muralidharan et al 2008 J. Phys.: Condens. Matter 20 374109 doi:10.1088/0953-8984/20/37/374109
B Muralidharan1,3, L Siddiqui1 and A W Ghosh2
Show affiliationsWe discuss the role of electron–electron and electron–phonon correlations in current flow in the Coulomb blockade regime, focusing specifically on non-trivial signatures arising from the breakdown of mean-field theory. By solving transport equations directly in Fock space, we show that electron–electron interactions manifest as gateable excitations experimentally observed in the current–voltage characteristic. While these excitations might merge into an incoherent sum that allows occasional simplifications, a clear separation of excitations into slow 'traps' and fast 'channels' can lead to further novelties such as negative differential resistance, hysteresis and random telegraph signals. Analogous novelties for electron–phonon correlation include the breakdown of commonly anticipated Stokes–anti-Stokes intensities, and an anomalous decrease in phonon population upon heating due to reabsorption of emitted phonons.
73.23.Hk Coulomb blockade; single-electron tunneling
71.38.-k Polarons and electron-phonon interactions
63.22.-m Phonons or vibrational states in low-dimensional structures and nanoscale materials
73.63.-b Electronic transport in nanoscale materials and structures
Condensed matter: electrical, magnetic and optical
Issue 37 (17 September 2008)
Received 22 May 2008
Published 26 August 2008
B Muralidharan et al 2008 J. Phys.: Condens. Matter 20 374109
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