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.

Wave Function Spectroscopy in Quantum Wells with Tunable Electron Density

Abstract: We present a new approach to investigate quantum-mechanical probability density distributions of electrons in a screened wide potential well, based on low-temperature magnetotransport measurements. Differences of subband energy levels shifted by an inserted controlled potential perturbation are measured and used to extract the difference of the squared amplitude of the respective wave functions at the location of the potential spike. The position of the wave functions and the carrier density can be tuned independently via front- and back-gate voltages. We find excellent agreement between the measured data and self-consistently calculated wave functions.

Liquid alloys with strong chemical interactions

Abstract: Information about basic chemical interactions and the electronic structure of liquid compounds can be obtained from the study of the appropriate solid compounds. Using this guideline, the properties of alkali-group 1B, IIIB, IVB and VB alloys are discussed and models for band structures are considered. Evidence is provided for a competition between simple octet and clustered configurations. In either of them the band structure appears to be largely determined by the anions. In charge-transfer clustered compounds both the crystal structure and the band structure are closely related to those of the pure elements in the next group of the periodic table.

Self-aligned charge read-out for InAs nanowire quantum dots

Abstract: A highly sensitive charge detector is realized for a quantum dot in an InAs nanowire. We have developed a self-aligned etching process to fabricate in a single step a quantum point contact in a two-dimensional electron gas and a quantum dot in an InAs nanowire. The quantum dot is strongly coupled to the underlying point contact which is used as a charge detector. The addition of one electron to the quantum dot leads to a change of the conductance of the charge detector by typically 20%. The charge sensitivity of the detector is used to measure Coulomb diamonds as well as charging events outside the dot. Charge stability diagrams measured by transport through the quantum dot and charge detection merge perfectly.