Solid State Physics Laboratory

About: Solid State Physics Laboratory is a facility organization based out in Delhi, India. It is known for research contribution in the topics: Quantum dot & Dielectric. The organization has 1754 authors who have published 2597 publications receiving 50601 citations.

Dynamics of coupled spins in quantum dots with strong spin-orbit interaction

Abstract: We investigated the time dependence of two-electron spin states in a double quantum dot fabricated in an InAs nanowire. In this system, spin-orbit interaction has substantial influence on the spin states of confined electrons. Pumping single electrons through a Pauli spin-blockade configuration allowed to probe the dynamics of the two coupled spins via their influence on the pumped current. We observed spin-relaxation with a magnetic field dependence different from GaAs dots, which can be explained by spin-orbit interaction. Oscillations were detected for times shorter than the relaxation time, which we attribute to coherent evolution of the spin states.

Determination of the Displacement Vector at the Anti-Phase Boundaries in Rutile by Contrast Experiments in the Electron Microscope

Abstract: Contrast experiments are used to determine by transmission electron microscopy and electron diffraction the displacement vector associated with the anti-phase boundaries in rutile The criteria derived elsewhere [3] for the contrast at π-boundaries are applied, and the conditions for extinction of the contrast are also used to determine the vector A vector of the type 1/6 〈211〉 is found, which is in disagreement with the 1/2 〈101〉 vector previously proposed [1, 2] The method used here is general and could be used to find the displacement vector at a stacking fault or an anti-phase boundary in other materials Kontrastexperimente werden benutzt, um den Verschiebungsvektor fur Gegenphasengrenzen in Rutil durch Elektronenmikroskopie und Elektronenbeugung zu bestimmen Die Kriterien, die an anderer Stelle [3] fur den Kontrast an π-Grenzen hergeleitet wurden, und die Bedingungen fur die Loschung des Kontrasts werden fur die Bestimmung des Vektors benutzt Ein Vektor vom Typ 1/6 〈211〉 wird gefunden, der nicht mit dem fruher [1, 2] vorgeschlagenen 1/2 〈101〉-Vektor ubereinstimmt Die hier benutzte Methode ist allgemein gultig und konnte zur Bestimmung des Verschiebungsvektors eines Stapelfehlers oder einer Gegenphasengrenze in anderen Materialien benutzt werden

Time-resolved charge detection with cross-correlation techniques

Abstract: 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 enable us to measure dot charging and discharging rates for significantly smaller signal-to-noise ratios than required for charge detection with a single QPC. This allows us to reduce the current level in the detector and therefore the invasiveness of the detection process and may help to increase the available measurement bandwidth in noise-limited setups.