Observation of non-trivial superconductivity on surface of type II Weyl semimetal

Phys.org  February 25, 2020 An international team of researchers (China, USA – University of Tennessee, Israel) reported the experimental evidence for the unconventional superconductivity generated by the surface states in TaIrTe4 from both scanning tunneling microscopy/ spectroscopy (STM/STS) and electrical transport measurements. They demonstrated its superconductivity by both the superconducting gap from STS and the consistent resistance drop from electrical transport. The thickness-independence of ultralow critical current and angular dependence of upper critical field (Bc2) indicate that the superconductivity occurs only in the surface states. The research offers a novel platform for exploring topological superconductors and may contribute to the […]

Perfect quantum portal emerges at exotic interface

Nanowerk  June 26, 2019 A team of researchers in the US (University of Maryland, UC Irvine) has observed perfect Andreev reflection in point-contact spectroscopy—a clear signature of Klein tunneling and a manifestation of the underlying ‘relativistic’ physics of a proximity-induced superconducting state in a topological Kondo insulator. The findings shed light on a previously overlooked aspect of topological superconductivity and can serve as the basis for a unique family of spintronic and superconducting devices, the interface transport phenomena of which are completely governed by their helical topological states…read more. TECHNICAL ARTICLE  

Physicists name and codify new field in nanotechnology: ‘electron quantum metamaterials’

Nanowerk  November 5, 2018 According to an international team of researchers (Singapore, USA – UC Riverside) synthesizing new materials by twisting and stacking atomically thin layers, is still in the “alchemy” stage. To bring it all under one roof, they have proposed this field of research be called “electron quantum metamaterials”. They highlight the potential of engineering synthetic periodic arrays with feature sizes below the wavelength of an electron and delve deeper and lay out the fundamental physics that may explain much of the research in electron quantum metamaterials…read more. TECHNICAL ARTICLE

Novel approach to coherent control of a three-level quantum system

Science Daily   August 8, 2018 Researchers in Switzerland combined a quantum system with a mechanical oscillator employing electrons trapped in nitrogen-vacancy centers and embedded these spins in single-crystalline mechanical resonators made from diamond. The nitrogen-vacancy spins possess three eigenstates, which can be described as “up,” “down” and “zero.” The researchers showed complete quantum control over such a three-level system, in a way not possible before. They showed that if the three eigenstates are coupled to each other the coherence time can be significantly extended. Research could have application in quantum sensing or quantum information processing… read more. Open Access TECHNICAL […]

Self-assembling, tunable interfaces found in quantum materials

Phys.org  March 27, 2018 Extensive research has shown that at interfaces between two materials, the remarkable properties of quantum materials can be strongly enhanced, or entirely new functional properties may arise. An international team of researchers (USA – Los Alamos National Laboratory, University of Tennessee, NIST, Oak Ridge National Laboratory, UK, Germany) has demonstrated that in certain metals, the competition between various interactions may be resolved by the spontaneous formation of a state in which the electronic and magnetic properties alternate periodically. The spontaneously self-assembling interfaces are intrinsically clean, and relevant parameters such as the interface thickness can be tuned […]