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.

Metal oxide SAW E-nose employing PCA and ANN for the identification of binary mixture of DMMP and methanol

Abstract: An Electronic nose (E-nose) made up of an array of metal oxide thin film based SAW sensors is proposed as a detection system for the binary mixture of DMMP (simulant of nerve agent) and methanol at room temperature The SAW devices are one port surface acoustic wave (SAW) resonators having center frequency of 4339 MHz The E-nose sensor array has SAW sensors coated with four different chemical sensitive coatings of ZnO, TeO2, SnO2 and TiO2 in order to recognize the individual components in a binary mixture of DMMP (in ppb levels) and methanol (in sub ppm levels) Principal Component Analysis (PCA) as a data pre-processing technique and Artificial Neural Network (ANN) as a pattern classification technique have been applied for obtaining a clear discrimination and correct classification

Superconductivity in single crystals of the fullerene C70.

Abstract: The observation of superconductivity in doped C60 has attracted much attention1,2,3, as these materials represent an entirely new class of superconductors. A maximum transition temperature (Tc) of 40 K has been reported4 for electron-doped C60 crystals, while a Tc of 52 K has been seen5 in hole-doped crystals; only the copper oxide superconductors have higher transition temperatures. The results for C60 raise the intriguing questions of whether conventional electron–phonon coupling alone1 can produce such high transition temperatures, and whether even higher transition temperatures might be observed in other fullerenes6,7,8. There have, however, been no confirmed reports of superconductivity in other fullerenes, though it has recently been observed in carbon nanotubes9. Here we report the observation of superconductivity in single crystals of electric-field-doped C70. The maximum transition temperature of about 7 K is achieved when the sample is doped to approximately four electrons per C70 molecule, which corresponds to a half-filled conduction band. We anticipate superconductivity in smaller fullerenes at temperatures even higher than in C60 if the right charge density can be induced.

Interference in a quantum dot molecule embedded in a ring interferometer

Abstract: Interference experiments are presented involving electronic quantum transport through an artificial quantum dot molecule in the Coulomb blockade regime embedded in a ring interferometer. Full tunability and the high stability of the structure allowed the transmission phase through this system, spin-related interference phenomena, and Fano-type interference to be studied. When a part of the interferometer is itself tuned into the Coulomb blockade regime, a phase-coherently coupled triple dot system can be investigated. The experiments demonstrate the feasibility of complex quantum circuits with a high degree of phase-coherence.