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.

Fully Automated Identification of Two-Dimensional Material Samples

Abstract: Thin nanomaterials are key constituents of modern quantum technologies and materials research. The identification of specimens of these materials with the properties required for the development of state-of-the-art quantum devices is usually a complex and tedious human task. In this work, we provide a neural-network-driven solution that allows for accurate and efficient scanning, data processing, and sample identification of experimentally relevant two-dimensional materials. We show how to approach the classification of imperfect and imbalanced data sets using an iterative application of multiple noisy neural networks. We embed the trained classifier into a comprehensive solution for end-to-end automatized data processing and sample identification.

Correlated counting of single electrons in a nanowire double quantum dot

Abstract: We report on correlated real-time detection of individual electrons in an InAs nanowire double quantum dot (DQD). Two self-aligned quantum point contacts (QPCs) in an underlying two-dimensional electron gas material serve as highly sensitive charge detectors for the DQD. Tunnel processes of individual electrons and all tunnel rates are determined by simultaneous measurements of the correlated signals of the QPCs.

Effect of field-dependent core size on reversible magnetization of high-κ superconductors

Abstract: The field dependence of the vortex core size {zeta}(B) is incorporated in the London model, in order to describe reversible magnetization M(B,T) for a number of materials with large Ginzburg-Landau parameter {kappa}. The dependence {zeta}(B) is directly related to deviations in M(ln B) from linear behavior prescribed by the standard London model. A simple method to extract {zeta}(B) from the magnetization data is proposed. For most materials examined, {zeta}(B) so obtained decreases with increasing field and is in qualitative agreement both with behavior extracted from {micro}SR and small-angle neutron-scattering data and with that predicted theoretically.

Doping dependence of the chemical potential in cuprate high-T-c superconductors .1. La2-XSrxCuO4

Abstract: A systematic study is performed of the doping dependence of the chemical potential μ in La 2− x Sr x CuO 4 as a function of the Sr content, using a well-characterized series of pellets and thin films. The measured shift of the chemical potential, as deduced from the changes in the photoelectron spectra, is compared with present models for the doping behavior of μ in high- T c materials. The results obtained can be best described assuming μ shifts due to the doping of a rigid narrow band.