Deutschmann, R. A. and Wegscheider, Werner and Rother, Martin and Bichler, Max and Abstreiter, Gerhard (2000) Negative differential resistance of a 2D electron gas in a 1D miniband. Physica E Low-dimensional Systems and Nanostructures 7 (1-2), pp. 294-298.
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We experimentally investigate the miniband transport in a novel kind of superlattice fabricated by the “cleaved edge overgrowth” method. The structure represents a field effect transistor, where the channel consists of an MBE-grown superlattice perpendicular to the current flow. By means of the gate the Fermi energy can be adjusted between the bottom of the first miniband and into the minigap. We observe pronounced negative differential resistance at electric fields across the superlattice as low as 160 V/cm. From magnetotransport measurements a relation between the applied gate voltage and the position of the Fermi energy in the artificial band structure is established. Electron mobility depending on the Fermi energy is deduced separately from Shubnikov–de Haas oscillations, from the voltage at the peak current and from the low-field resistance.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|Keywords:||Superlattice; Miniband transport; Negative differential resistance; Bloch oscillations|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||30 Nov 2009 13:16|
|Last Modified:||20 Jul 2011 22:08|