title: Magnetotransport in two-dimensional electron gas in helical nanomembranes.
abstract: Heterostructures containing high-mobility two-dimensional electron gas were rolled into freestanding helically shaped contacted Hall bars. Magnetotransport measurements in these structures at high magnetic fields revealed minima in the longitudinal magnetoresistance corresponding to integer and fractional filling factors. A strong asymmetry of the longitudinal magnetoresistance with respect to the external magnetic field direction was observed. For this new type of structures, an edge state picture was considered, and calculations based on the Landauer-Büttiker formalism are performed.
authors: Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Science , pr. Lavrentieva 13, 630090 Novosibirsk, Russia.
authors: Julia S
authors: JS
authors: Vorobyova
authors: Alexander B
authors: AB
authors: Vorob'ev
authors: Victor Y
authors: VY
authors: Prinz
authors: Alexander I
authors: AI
authors: Toropov
authors: Duncan K
authors: DK
authors: Maude
keywords: edge channels; electron transport; fractional quantum Hall effect; helical nanomembranes; magnetic field gradient; two-dimensional electron gas on cylindrical surface