Abstract
A nonplanar geometry for the quantum Hall (QH) effect is studied, whereby two quantum Hall systems are joined at a sharp right angle. When both facets are at equal filling factor the junction hosts a channel with nonquantized conductance, dependent on . The state is metallic at , with conductance along the junction increasing as the temperature drops. At it is strongly insulating, and at shows only weak dependence. Upon applying a dc voltage bias along the junction, the differential conductance again shows three different behaviors. Hartree calculations of the dispersion at the junction illustrate possible explanations, and differences from planar QH structures are highlighted.
- Received 10 September 2007
DOI:https://doi.org/10.1103/PhysRevB.76.201304
©2007 American Physical Society