Band Superconductivity in Periodic Constricted Nanoribbon Structures
May 6 (Thursday), 2021
11:30 am to 12:30 pm (EDT)
Virtual via Zoom
Abstract: New prospects of superconducting nanostructures with size-quantized states open possibilities for potential applications in novel devices, which range from electromagnetic field sensors to quantum computation platforms. Behind some of the interesting effects related to the size quantization is the formation of multiple quantum channels for the superconducting condensate, the so-called “shape resonance”, associated with the quantization of the electronic motion and the dependence of the superconducting critical temperature on the width of atomically thin superconducting films. The nanoscale confinement modifies, in particular, the density of states (DOS) close to the Fermi energy, where the superconductor pairing interactions take place. A periodic geometrically constricted 2D NbSe2 nanowire (called a nanoribbon) is investigated with the Bogoliubov-de Gennes (BdG) equation showing a possibility to completely redefine the properties of the system via manipulation of the geometry or the electron concentration.
Biography: Dr. Marcio de Andrade conducted his Ph.D. in non-Fermi liquid materials and superconductivity under Professor Brian Maple in a joint graduate program between University of California, San Diego (UCSD) and Campinas State University (UNICAMP), Brazil. Dr. de Andrade was a Post-Doctoral fellow at the Institute for Pure and Applied Physics at UCSD. Subsequently, he spent ten years working with small business and he joined the Naval Information Warfare Center Pacific (NIWC) in 2009. At NIWC, he developed the first CMOS/graphene integrated quantum detector for the NAVY for RF detection. Dr. de Andrade’s specific fields of interest and contribution include non-Fermi liquid behavior, superconducting microwave devices, superconducting quantum interference device (SQUID) arrays, high temperature superconducting (HTS) devices for RF systems, bio-magnetism, human factor psychology and human-machine interface, and emerging quantum information technologies. He is an IEEE Senior Member, and was awarded the Navy Meritorious Service Medal.