Quantum Control With Light Paves Way For Ultra-Fast Computers

Terahertz light can control some of the essential quantum properties of superconducting states, report researchers. Jigang Wang patiently explains his latest discovery in quantum control that could lead to superfast computing based on quantum mechanics: He mentions light-induced superconductivity without energy gap. He brings up forbidden supercurrent quantum beats. And he mentions terahertz-speed symmetry breaking. Then he backs up and clarified all that. After all, the quantum world of matter and energy at terahertz and nanometer scales — trillions of cycles per second and billionths of meters — is still a mystery to most of us. [Read More]

Two-Dimensional Boron Is A Low-temperature Superconductor

Two-dimensional boron is a natural low-temperature superconductor, Rice University scientists have established. In fact, it may be the only 2-D material with such potential. Rice theoretical physicist Boris Yakobson and his co-workers published calculations that show atomically flat boron is metallic and will transmit electrons with no resistance. The catch, as with most superconducting materials, is that it loses its resistivity only when very cold, in this case between 10 and 20 kelvins (roughly, minus-430 degrees Fahrenheit). [Read More]

Iron Selenide Thin Films For High-temperature Superconductivity

An atomically thin, high-temperature superconductor film has been created, by researchers group Tohoku University, which has a superconducting transition temperature (Tc) of up to 60 K (-213°C). Superconductors are looked on as being among the most promising technologies for next-generation advanced electronic devices. This because the special quantum effects in superconductors are a big advantage in getting ultrahigh-speed processing and energy-savings. The group’s finding provides a perfect platform for investigating the mechanism of superconductivity in two-dimensional systems. [Read More]

High-Temperature Superconductors Investigated with Mira Supercomputer

Researchers from the University of Illinois at Urbana-Champaign (UIUC) are using supercomputing resources at the Argonne Leadership Computing Facility (ALCF), a DOE Office of Science User Facility, to shed light on the mysterious nature of high-temperature superconductors. With critical temperatures ranging from 30 Kelvin to 130 Kelvin (405 degrees below zero to 225 degrees below zero Fahrenheit), this relatively new class of superconductors is high-temperature in name only. Prior to their discovery in 1986, it was widely believed that superconductivity, a material’s ability to transmit electric current with no resistance, could only occur below temperatures of 30 Kelvin. [Read More]