The black body radiator was a concept from the middle of the 19th century, introduced by Kirchhoff in 1859. Das Institut für Theoretische Physik trauert um Prof. Anja Metelmann and Tobias Brandes We suggest that a single-electron transistor continuously monitored by a quantum point contact may function as a Maxwell demon when closed-loop feedback operations are applied as time-dependent modifications of the tunneling rates across its junctions. On the other hand, topological band structures give rise to symmetry protected midgap states. Our results, which show that deviations from Poissonian behaviour strongly depend on frequency, demonstrate the importance of finite-frequency higher-order cumulants in fully characterizing interactions. His latest research is also related to topics in biology and the social sciences, e. This electronic purification is independent of the initial qubit state and is accomplished after few electron jumps through the detector.

NextWe demonstrate the stabilization of pure delocalized qubit states above a critical detector-qubit coupling. The overarching goal of the Collaborative Research Center 910 funded by the German Research Foundation since 2011 is to control dissipative structures in nonlinear dynamical systems far from thermodynamic equilibrium. For couplings to multiple baths held at different temperatures and different chemical potentials, we identify a class of systems that equilibrates according to a single hypothetical average but in general nonthermal bath, which may be exploited to generate desired nonthermal states. Eckehard Schöll 2009 at a protest lecture in front of the Roten Rathaus during the students strike. The relationship of topological insulators and superconductors and the field of nonlinear dynamics is widely unexplored. Kirchhoff discussed the thermal equilibrium between the radiation heat within an arbitrarily shaped container and the walls of the container black bodies that completely absorb all incident radiation.

NextCheck other In accordance with Google Safe Browsing, Symantec and Web of Trust tu-berlin. We show how to gain detailed quantitative knowledge about the attached spin such as spin size, exchange coupling strength, Landé g-factor, and spin decay time T1 by utilizing a robust blockade phenomenon of dc magnetotransport with accompanying noise enhancement. These findings demonstrate that the counting statistics of a single resonant level may be used to probe background charge configurations. We study the entanglement dynamics in the externally-driven single-mode Dicke model in the thermodynamic limit, when the field is in resonance with the atoms. In particular, we found a strong relation between the stability of the dynamical parameters and the reported entanglement. Many physically interesting models show a quantum phase transition when a single parameter is varied through a critical point, where the ground state and the first excited state become degenerate. We study the influence of the qubit on the electronic steady-state currents through the system, the entanglement between the transport double quantum dots, and the back-action on the charge qubit.

NextWe investigate the dynamics of a single phonon oscillator mode linearly coupled to an electronic few-level system in contact with external particle reservoirs leads. Please note the section about. Using mathematical properties of high-order derivatives in the complex plane we show that the oscillations of the cumulants in fact constitute a universal phenomenon, appearing as functions of almost any parameter, including time in the transient regime. The adiabatic theorem implies that in order to obtain a good preparation fidelity the runtime τ should scale with the inverse energy gap and thereby also with the system size. McAfee does not analyze tu-berlin. Control and dynamics of multilayer networks The objective of the present project is to investigate emergent phenomena and their control in multilayer networks that offer better representation of the topology and dynamics of real-world systems in comparison with one-layer structures.

NextGerold Kiesslich, Gernot Schaller, Clive Emary, and Tobias Brandes or We study transport through a triple quantum dot in a triangular geometry with applied bias such that both singly- and doubly-charged states participate. For weak driving the system exhibits a set of side-bands which allow the circumvention of the no-go theorem which otherwise forbids the occurence of superradiant phase transitions. The Institute for Theoretical Physics mourns the decease of Prof. We analyse this Hopf bifurcation scenario as a function of delay time and feedback strength and determine analytical conditions for the phase boundaries. They first tried to blacken metallic platinum plates without much success. Gerold Kiesslich, Gernot Schaller, Clive Emary, and Tobias Brandes For open quantum systems coupled to a thermal bath at inverse temperature β, it is well known that under the Born, Markov, and secular approximations, the system density matrix will approach the thermal Gibbs state with the bath inverse temperature β. Christina Pöltl, Clive Emary, and Tobias Brandes or We study the transport properties of the Fano-Anderson model with non-Markovian effects, which are introduced by making one tunneling-rate energy dependent.

NextWe explicitly demonstrate the effect of spatial deformation of the dot on the wave function's overlap. We particularly aim to disclose the interconnections between multiplexing, communication delay, and stochasticity to develop efficient control strategies. Neill Lambert, Clive Emary, Yueh-Nan Chen, Franco Nori Using a generic model for stochastic transport through a single quantum dot that is modified by the Coulomb interaction of environmental weakly coupled quantum dots, we derive general properties of the full counting statistics for multi-stable Markovian transport systems. Leave a Reply Your email address will not be published. We investigate the transport through a few-level quantum system described by a Markovian master equation with temperature- and particle-density-dependent chemical potentials. It turned out that Wien's law was quite a good description of the experimental data but there were small deviations at large temperatures.

NextWe demonstrate that this novel mechanism for super-Poissonian charge transfer is very sensitive to decoherence caused by electron-phonon scattering as inferred from the measured temperature dependence. Die Arbeitsgruppe beschäftigt sich zur Zeit stark mit Quantenkohärenz, Quantenoptik, und Vielteilchen-Effekten in niedrigdimensionalen Festkörperstrukturen. We analyze, how the condensate influences the topology of the Bogoliubov excitations. The obtained currents show signatures of the qubit. Eigther you can browse the research groups and contact the head of your group of interest.

NextThese results are illustrated by several examples. Note: Articles may be assigned to more than one subject area. Lummer and Pringsheim again improved their experiment into the range of up to wavelengths of m and K, and the deviations became even stronger. We study the temporal crossover from multi-modal to broad uni-modal distributions depending on the initial mixture, the long-term asymptotics and the divergence of the cumulants in the limit of a large number of transport branches. The effect should be observable for atoms confined within a nano-cell with a pumped optical cavity as photon source.

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