Spin-phonon coupling in antiferromagnetic nickel oxide
January 16, 2018 - A research team led by SHINES PIs Prof. Balandin, Prof. Shi and Prof. Lake at UC Riverside has determined the spin-phonon coupling coefficients of the antiferromagnetic material (NiO) utilizing ultraviolet (λ=325 nm) Raman spectroscopy. Their results established that the spins of Ni atoms interact more strongly with longitudinal optical phonons (compared to transverse optical phonons) and produce opposite effects on the phonon energies. The paper was published in Appl. Phys. Lett. and highlighted by UCR Today.
Enhanced interlayer carrier multiplication in 2D semiconductor heterostructures
October 9, 2017 - The Gabor group, in collaboration with the Lake group, has shown that 2D transition metal dichalcogenide heterostructures can be used to efficiently multiply photocurrent at the nanoscale. The work was published in Nature Nanotechnology. and highlighted by UCR Today.
July 25, 2017 - A collaborative project by the groups of Elaine Li and Kang Wang has been profiled in Frontiers in Energy Research, the quarterly newsletter published by the DOE Office of Science. The project is notable for demonstrating the creation and control of skyrmion dimensions at room-temperature.
Chiral Majorana fermion modes in a quantum anomalous Hall insulator–superconductor structure
July 24, 2017 - The Kang L. Wang group has published a paper in Science on Majorana fermion modes. They report transport measurements that suggest the existence of one-dimensional chiral Majorana fermion modes in the hybrid system of a quantum anomalous Hall insulator thin film coupled with a superconductor. As the external magnetic field is swept, half-integer quantized conductance plateaus are observed at the locations of magnetization reversals, giving a distinct signature of the Majorana fermion modes.This work is highlighted in UCLA news.
Above 400-K robust perpendicular ferromagnetic phase in a topological insulator
June 23, 2017 - The Shi group has made topological insulator (TI) surfaces magnetic from room temperature to more than 400 Kelvin. The Curie temperature (Tc) is enhanced by exchange coupling TIs to Tm3Fe5O12, a high-Tc magnetic insulator with perpendicular magnetic anisotropy. Distinct squared anomalous Hall hysteresis loops at 400 K reveal that the TI surface states acquire robust ferromagnetism. The paper was published in SCIENCE ADVANCES and highlighted by UCR Today.
SHINES Workshop 2017
SHINES will hold a workshop on spin and heat from January 12-13th, 2017 at the UCR Palm Desert Center.
Workshop program is here http://efrcshines.ucr.edu/files/1.pdf.