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HL: Halbleiterphysik

HL 27: Symposium New phenomena in edge transport of QHE systems

HL 27.1: Fachvortrag

Wednesday, March 29, 2006, 14:30–15:00, HSZ 01

Bending the quantum Hall effect: Novel metallic and insulating states in one dimension — •Matthew Grayson — Walter Schottky Institut, TU-Muenchen

One-dimensional conductors are the wires that will connect the circuits of tomorrow’s nanoworld, so it is important to characterize their possible conducting phases. We study a novel one-dimensional wire state which arises at the corner of two quantum Hall systems joined at a 90 degree angle, and observe one-dimensional metallic and insulating states. Such non-planar confinement structures are unconventional for the quantum Hall effect and reveal the striking observation of a macroscopic one-dimensional state whose conductance increases with decreasing temperature. This single system can map out generic properties of disordered one-dimensional conductors since the metallic, critical, or insulating character is tunable with an external parameter, the magnetic field.