Abstract
Hydrostatic pressure and illumination have been used to investigate electron transport through a clean one-dimensional constriction in a deep two-dimensional electron gas (2DEG) formed at a interface. Up to 20 quantized conductance steps were observed at integer multiples of as well as a clear additional step (the “0.7 structure”) at approximately Using both pressure and illumination the electron density in the 2DEG was reduced from to and a shift in the conductance of the “0.7 structure” towards the spin-split value of was observed. The density measurements are compared to calculations of the 2D electron density as a function of pressure, obtained by solving the Schrödinger-Poisson equation for the heterostructure. There is also a reversal of the persistent photoconductivity effect at high pressures that cannot be accounted for.
- Received 6 December 2001
DOI:https://doi.org/10.1103/PhysRevB.65.233316
©2002 American Physical Society