β Scribed by K.J Thomas; J.T Nicholls; W.R Tribe; M.Y Simmons; A.G Davies; D.A Ritchie; M Pepper
No coin nor oath required. For personal study only.
Low-temperature conductance measurements of strongly coupled ballistic one-dimensional (1D) wires show the formation of bonding and antibonding 1D states. Two parallel 1D wires are deΓΏned by a split-gate structure deposited on a GaAs=AlGaAs double quantum well with a 25 A AlGaAs barrier. A midline gate positioned at the centre of the split-gate allows both the widths and electron densities of the two wires to be tuned. At resonance when the wires are matched, symmetric and antisymmetric 1D energy levels are formed, and are separated by an energy gap SAS. The overlap integral that describes the mixing of the 1D wave functions of di erent index in the two wires can be altered with a small in-plane magnetic ΓΏeld B. We also present preliminary measurements of the mixing of edge states in the quantum Hall regime.
π SIMILAR VOLUMES
Low temperature measurements of ballistic one-dimensional (1D) wires show an additional structure at 0:7(2e 2 =h) in the conductance characteristics (Phys. Rev. Lett. 77 (1996) 135; Phys. Rev. B 62 (2000) 10 950). This 0.7 structure develops into a plateau at e 2 =h, if, either the in-plane magnetic