Zobrazeno 1 - 10
of 301
pro vyhledávání: '"Reinwald, M."'
Publikováno v:
Phys. Rev. B 79, 035314 (2009)
We present time-resolved charge sensing measurements on a GaAs double quantum dot with two proximal quantum point contact (QPC) detectors. The QPC currents are analyzed with cross-correlation techniques, which enables us to measure dot charging and d
Externí odkaz:
http://arxiv.org/abs/0810.2406
Autor:
Wirthmann, André, Hui, Xiong, Mecking, N., Gui, Y. S., Chakraborty, T., Reinwald, M., Schüller, C., Wegscheider, W., Hu, C. -M.
Publikováno v:
APL 92 232106 (2008)
We report on microwave photovoltage and simultaneous magnetotransport measurements in a (Ga,Mn)As film oriented normal to the magnetic field. We detect the ferromagnetic resonance over a broad frequency range of 2 GHz to 18.5 GHz and determine the sp
Externí odkaz:
http://arxiv.org/abs/0806.0785
Quantum interference effects and resulting quantum corrections of the conductivity have been intensively studied in disordered conductors over the last decades. The knowledge of phase coherence lengths and underlying dephasing mechanisms are crucial
Externí odkaz:
http://arxiv.org/abs/0801.3363
We investigate the current-phase-relation (CPR) of long diffusive superconductor-normal metal-superconductor (SNS) Josephson junctions in thermodynamic equilibrium and under microwave irradiation. While in equilibrium good agreement with the predicti
Externí odkaz:
http://arxiv.org/abs/0707.4512
Publikováno v:
Phys. Rev. B 75, 075314 (2007)
We present measurements of the fourth and fifth cumulants of the distribution of transmitted charge in a tunable quantum dot. We investigate how the measured statistics is influenced by the finite bandwidth of the detector and by the finite measureme
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607192
Autor:
Pioda, A., Kicin, S., Brunner, D., Ihn, T., Sigrist, M., Ensslin, K., Reinwald, M., Wegscheider, W.
Publikováno v:
Phys. Rev. B 75, 045433 (2007)
A quantum point contact (QPC) patterned on a two-dimensional electron gas is investigated with a scanning gate setup operated at a temperature of 300 mK. The conductance of the point contact is recorded while the local potential is modified by scanni
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607161
To understand quantum mechanical transport in ferromagnetic semiconductor the knowledge of basic material properties like phase coherence length and corresponding dephasing mechanism are indispensable ingredients. The lack of observable quantum pheno
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603418
Publikováno v:
Phys. Rev. Lett. 96, 046802 (2006)
We investigate Kondo effect and spin blockade observed on a many-electron quantum dot and study the magnetic field dependence. At lower fields a pronounced Kondo effect is found which is replaced by spin blockade at higher fields. In an intermediate
Externí odkaz:
http://arxiv.org/abs/cond-mat/0509377
Publikováno v:
Phys. Rev. Lett. 96, 036804 (2006)
Two quantum dots with tunable mutual tunnel coupling have been embedded in a two-terminal Aharonov-Bohm geometry. Aharonov-Bohm oscillations are investigated in the cotunneling regime. Visibilities of more than 0.8 are measured indicating that phase-
Externí odkaz:
http://arxiv.org/abs/cond-mat/0508757
Publikováno v:
Phys. Rev. B 72, 233402 (2005)
With non-invasive methods, we investigate ground and excited states of a lateral quantum dot. Charge detection via a quantum point contact is used to map the dot dynamics in a regime where the current through the dot is too low for transport measurem
Externí odkaz:
http://arxiv.org/abs/cond-mat/0508130