Research News

THz-Radiation Generated from Interfacial Spin-Orbit Coupling

May 18, 2018 - Electromagnetic terahertz (THz) radiation is a versatile tool for a wide variety of sensing technologies ranging from security systems to medical applications.  Commonly, THz radiation is created using photoconductive switches and nonlinear crystals.  Recently, it was shown that optical excitation of fast spin current pulses in magnetic materials may generate strong THz radiation from transverse spin transport phenomena.

Selections from 2017: The Age of a 4-Star System

Artist's impression of a quadruple star system in which two binaries orbit each other. [Institute for Astronomy, U of Hawaii]

January 11, 2018- Dr. James MacDonald and Dr. Dermott Mullan recently derived the age of the quadruple star system KIC 7177553. The system appears to be younger than originally thought — it’s best modeled as being 32–36 million years old. 

Unraveling quantum states of charge and spin in topological spintronics

August 11, 2017 - In the recent Nano Letters article, Prof. Nikolic, postdoctral fellow Dr. Kapildeb Dolui, visiting graduate student Juan Manuel Marmolejo-Tejada from Colombia and DPA alumni Dr. Po-Hao Chang, together with collaborators from Denmark and Croatia, have developed new computational approach offering a unique microscopic insight into quantum states of charge and spin at  topological-insulator/ferromagnetic-metal (TI/FM) interfaces.

Star with seven possible Earth-like planets has UD connection

February 22, 2017 - When NASA announced in a news conference Wednesday, Feb. 22, that researchers had found seven potentially Earth-like planets orbiting a star 235 trillion miles away, John Gizis, a professor at the University of Delaware, got a big grin on his face. Gizis actually discovered that star in 1999. “It’s extremely exciting,” Gizis said from his office in UD’s Department of Physics and Astronomy. “It’s a very small and cool dwarf star.

Charge, spin and valley Hall effects in disordered graphene reviewed

December 23, 2016 - In the recent review article, Prof. Nikolic and collaborators from Grenoble and Barcelona provide comprehensive coverage of different types of Hall effects, both in their classical and quantized versions, observed in graphene where electrons can scatter elastically from adatoms, vacancies and impurities or inelastically from lattice vibrations. 

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