4 papers
Quasi-particle transitions in charge-phase qubits probed by rf oscillations
J. Könemann, H. Zangerle, B. Mackrodt +2
We investigated transitions in Al charge-phase qubits of SQUID-configuration inductively coupled to an rf tank circuit that made it possible to read out the state by measuring the…
Tunneling resonances in quantum dots: Coulomb interaction modifies the width
J. Könemann, B. Kubala, J. König +1
Single-electron tunneling through a zero-dimensional state in an asymmetric double-barrier resonant-tunneling structure is studied. The broadening of steps in the -- characte…
Correlation-function spectroscopy of inelastic lifetime in heavily doped GaAs heterostructures
J. Könemann, P. König, T. Schmidt +3
Measurements of resonant tunneling through a localized impurity state are used to probe fluctuations in the local density of states of heavily doped GaAs. The measured differential…
Spin Effects in the Local Density of States of GaAs
P. König, T. Schmidt, R. J. Haug
We present spin-resolved measurements of the local density of states in Si doped GaAs. Both spin components exhibit strong mesoscopic fluctuations. In the magnetic quantum limit, t…