4 papers
From single dots to interacting arrays
Vidar Gudmundsson, Andrei Manolescu, Roman Krahne +1
We explore the structural changes in charge the density and the electron configuration of quantum dots caused by the presence of other dots in an array, and the interaction of neig…
Oscillator strengths of dark charged excitons in the quantum Hall regime
C. Schueller, K. -B. Broocks, Ch. Heyn +1
By direct absorption spectroscopy and comparison to photoluminescence (PL), we investigate negatively charged excitons in dilute two-dimensional electron systems at temperatures do…
Far-Infrared Excitations below the Kohn Mode: Internal Motion in a Quantum Dot
Roman Krahne, Vidar Gudmundsson, Christian Heyn +1
We have investigated the far-infrared response of quantum dots in modulation doped GaAs heterostructures. We observe novel modes at frequencies below the center-of-mass Kohn mode.…
Manifestation of the magnetic depopulation of one-dimensional subbands in the optical absorption of acoustic magnetoplasmons in side-gated quantum wires
C. Steinebach, T. Kurth, D. Heitmann +1
We have investigated experimentally and theoretically the far-infrared (FIR) absorption of gated, deep-mesa-etched GaAs/AlGaAs quantum wires. To overcome Kohn's theorem…