Evidence of momentum-resolved spectroscopy at a bent quantum Hall edge

Matthew Grayson

Northwestern University, USA

A bent quantum well (BQW) fabricated by corner overgrowth provides a unique way of coupling to quantum Hall edges without a separation barrier. When the BQW length is reduced to the mean free path of circa 10 um, one obtains a weak link between two perpendicular two-dimensional electron systems (2DES), allowing for transport spectroscopy of the electronic states at the junction. If the magnetic field is oriented perpendicular to one of the facets, one can study the coupling between the quantum Hall edge states in this facet and the 2DES on the other facet parallel to the B-field. Evidence of momentum-resolved spectroscopy of the quantum Hall edge in such a system will be examined, and compared to Hartree calculations of the electron dispersion at the junction.