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Transport in a three-terminal graphene quantum dot in the multi-level regime
Transport three-terminal graphene quantum dot the multi-level regime
2012/2/27
We investigate transport in a three-terminal graphene quantum dot. All nine elements of the conductance matrix have been independently measured. In the Coulomb blockade regime accurate measurements of...
Attojoule all-optical switching with a single quantum dot
Attojoule all-optical single quantum dot Quantum Physics
2011/8/17
Abstract: We experimentally investigate the dynamic nonlinear response of a single quantum dot (QD) strongly coupled to a photonic crystal cavity-waveguide structure. The temporal response is measured...
Ultrafast photon-photon interaction in a strongly coupled quantum dot-cavity system
photon-photon interaction coupled quantum dot-cavity system two weak light beams Quantum Physics
2011/8/17
Abstract: We study dynamics of the interaction between two weak light beams mediated by a strongly coupled quantum dot-photonic crystal cavity system. First, we perform all optical switching of a weak...
Strain-tuning of quantum dot optical transitions via laser-induced surface defects
Strain-tuning quantum dot optical transitions laser-induced surface defects
2011/8/17
Abstract: We discuss the fine-tuning of the optical properties of self-assembled quantum dots by the strain perturbation introduced by laser-induced surface defects. We show experimentally that the qu...
Bloch-wave engineering of quantum dot-micropillars for cavity quantum electrodynamics experiments
Bloch-wave engineering quantum dot-micropillars cavity quantum electrodynamics experiments
2011/8/4
Abstract: We have employed Bloch-wave engineering to realize submicron diameter ultra-high quality factor GaAs/AlAs micropillars (MPs). The design features a tapered cavity in which the fundamental Bl...
Molecule States in a Gate Tunable Graphene Double Quantum Dot
Molecule States Gate Tunable Graphene Double Quantum Dot
2010/11/25
We have measured a graphene double quantum dot device with multiple electrostatic gates that
are used to enhance control to investigate it. At low temperatures the transport measurements
reveal hone...
The Kondo crossover in shot noise of a single quantum dot with orbital degeneracy
Kondo crossover orbital degeneracy
2010/11/19
We investigate out of equilibrium transport through an orbital Kondo system realized in a single quantum dot, described by the multiorbital impurity Anderson model. Shot noise and current are calculat...
Conditional phase shift from a quantum dot in a pillar microcavity
quantum dot pillar microcavity Quantum Physics
2010/11/8
Large conditional phase shifts from coupled atom-cavity systems are a key requirement for building a spin photon interface. This in turn would allow the realisation of hybrid quantum information schem...
Quantum dot-cavity strong-coupling regime measured through coherent reflection spectroscopy in a very high-Q micropillar
Quantum dot-cavity strong-coupling regime coherent reflection spectroscopy high-Q micropillar
2010/11/18
We report on the coherent reflection spectroscopy of a high-quality factor micropillar, in the strong coupling regime with a single InGaAs annealed quantum dot. The absolute reflectivity measurement i...
We calculate the mesoscopic admittance G(!) of a double quantum dot, which can be measured
directly using microwave techniques. This quantity shows a rich behavior. In particular, it is directly sens...
Double quantum dot with tunable coupling in an enhancement-mode silicon metal-oxide semiconductor device with lateral geometry
Double quantum dot enhancement-mode silicon lateral geometry
2010/11/17
We present transport measurements of a tunable silicon metal-oxide-semiconductor double quantum dot device with lateral geometry. Experimentally extracted gate-to-dot capacitances show that the device...
Detection of spin injection into a double quantum dot: Violation of magnetic-field-inversion symmetry of nuclear polarization instabilities
Detection of spin injection double quantum dot: Violation nuclear polarization instabilities
2010/11/19
In mesoscopic systems with spin-orbit coupling, spin-injection into quantum dots at zero magnetic eld is expected under a wide range of conditions. However, up to now, a viable approach for experimen...
Phonon-assisted decoherence and tunneling in quantum dot molecules
quantum dot phonon decoherence tunneling
2010/11/22
We study the influence of the phonon environment on the electron dynamics in a doped quantum dot molecule.A non-perturbative quantumkinetic theory based on correlation expansion is used in order to de...
Correlation- and Interference-Induced Suppression and Enhancement of Current in a two-level Quantum Dot
Correlation uppression Enhancement of Current
2010/11/24
Motivated by the recent discovery of a canyon of conductance suppression in a two-level equal spin quantum dot system [Nilsson et al. Phys. Rev. Lett. 104, 186804 (2010)] the transport through this sy...
Cotunneling effects in GaAs vertical double quantum dot
Cotunneling effects GaAs vertical double quantum dot
2010/11/24
Semiconductor quantum dots have been a subject of intensive investigation over last two
decades. One reason is the proposal [1] to use spin state of electron in a quantum dot as a
quantum bit of inf...
