Publications (10)
Far-infrared quantum cascade lasers operating in AlAs phonon Reststrahlen band
K. Ohtani, M. Beck, M. J. Süess +6
We report on the operation of a double metal waveguide far-infrared quantum cascade laser emitting at 28 m, corresponding to the AlAs-like phonon Reststrahlen band. To avoid ab…
Magnetic control of Coulomb scattering and terahertz transitions among excitons
J. Bhattacharyya, S. Zybell, F. EÃer +9
Time-resolved terahertz quenching studies of the magnetoexcitonic photoluminescence from GaAs/AlGaAs quantum wells are performed. A microscopic theory is developed to analyze the e…
Singular charge fluctuations at a magnetic quantum critical point
L. Prochaska, X. Li, D. C. MacFarland +12
Strange metal behavior is ubiquitous to correlated materials ranging from cuprate superconductors to bilayer graphene. There is increasing recognition that it arises from physics b…
Bound-to-bound and bound-to-continuum optical transitions in combined quantum dot - superlattice systems
F. F. Schrey, L. Rebohle, T. Mueller +6
By combining band gap engineering with the self-organized growth of quantum dots, we present a scheme of adjusting the mid-infrared absorption properties to desired energy transiti…
Terahertz dynamics of a topologically protected state: quantum Hall effect plateaus near cyclotron resonance in a GaAs/AlGaAs heterojunction
A. V. Stier, C. T. Ellis, H. Zhang +5
We measure the Hall conductivity of a two-dimensional electron gas formed at a GaAs/AlGaAs heterojunction in the terahertz regime close to the cyclotron resonance frequency by empl…
Rayleigh scattering in coupled microcavities: Experiment
Z. Vörös, P. Mai, M. Sassermann +4
We experimentally analyze Rayleigh scattering in coupled planar microcavities. We show that the correlations of the disorder in the two cavities lead to inter-branch scattering of…
Midinfrared Semiconductor Photonics - A Roadmap
J. R. Meyer, I. Vurgaftman, S. -Q. Yu +56
Semiconductor photonic devices operating in the midwave infrared (mid-IR, which we roughly define here as wavelengths spanning 3 to 14 microns) uniquely address a wide range of cur…
High-frequency breakdown of the integer QHE in GaAs/AlGaAs heterojunctions
V. Dziom, A. Shuvaev, A. V. Shchepetilnikov +3
The integer quantum Hall effect is a well-studied phenomenon at frequencies below about 100 Hz. The plateaus in high-frequency Hall conductivity were experimentally proven to retai…
Reversing the Pump-Dependence of a Laser at an Exceptional Point
M. Brandstetter, M. Liertzer, C. Deutsch +6
When two resonant modes in a system with gain or loss coalesce in both their resonance position and their width, a so-called "Exceptional Point" occurs which acts as a source of no…
Free carrier absorption in quantum cascade structures
F. Carosella, C. Ndebeka-Bandou, R. Ferreira +5
We show that the free carrier absorption in Quantum Cascade Lasers is very small and radically different from the classical Drude result on account of the orthogonality between the…