Radiation Sources

Current-carrying chiral edge states in quantum Hall systems exhibit fascinating properties typically studied using electron spectroscopy and interferometry. Here we demonstrate that electron occupation, current, and coherence in the chiral edge states can be selectively probed and controlled by low-energy electromagnetic radiation in the microwave to infrared range, without affecting electron states in the bulk or disrupting the quantum Hall effect conditions within the sample.

We develop a general nonperturbative formalism and propose a specific scheme for maximally efficient generation of biphoton states by parametric decay of single photons.

Abstract Many-body Coulomb interactions drastically modify the optical response of highly doped semiconductor quantum wells leading to a merger of all intersubband transition resonances into one sharp peak at the frequency substantially higher than all single-particle transition frequencies.