10 papers
Single-electron transport driven by surface acoustic waves: moving quantum dots versus short barriers
P. Utko, J. Bindslev Hansen, P. E. Lindelof +2
We have investigated the response of the acoustoelectric current driven by a surface-acoustic wave through a quantum point contact in the closed-channel regime. Under proper condit…
Photoluminescence investigations of 2D hole Landau levels in p-type single Al_{x}Ga_{1-x}As/GaAs heterostructures
M. Kubisa, L. Bryja, K. Ryczko +7
We study the energy structure of two-dimensional holes in p-type single Al_{1-x}Ga_{x}As/GaAs heterojunctions under a perpendicular magnetic field. Photoluminescence measurments wi…
Dilation of the Giant Vortex State in a Mesoscopic Superconducting Loop
S. Pedersen, G. R. Kofod, J. C. Hollingbery +2
We have experimentally investigated the magnetisation of a mesoscopic aluminum loop at temperatures well below the superconducting transition temperature . The flux quantisa…
Mesoscopic decoherence in Aharonov-Bohm rings
A. E. Hansen, A. Kristensen, S. Pedersen +2
We study electron decoherence by measuring the temperature dependence of Aharonov-Bohm (AB) oscillations in quasi-1D rings, etched in a high-mobility GaAs/GaAlAs heterostructure. T…
Bias and temperature dependence of the 0.7 conductance anomaly in Quantum Point Contacts
A. Kristensen, H. Bruus, A. E. Hansen +8
The 0.7 (2e^2/h) conductance anomaly is studied in strongly confined, etched GaAs/GaAlAs quantum point contacts, by measuring the differential conductance as a function of source-d…
Investigation of the Mesoscopic Aharonov-Bohm effect in Low Magnetic Fields
A. E. Hansen, S. Pedersen, A. Kristensen +2
We have investigated the Aharonov-Bohm effect in mesoscopic semiconductor GaAs/GaAlAs rings in low magnetic fields. The oscillatory magnetoconductance of these systems is systemati…