Science Daily May 24, 2022 Key applications such as THz scanning tunnelling microscopy or electronic devices operating at optical clock rates call for ultimately short, almost unipolar waveforms, at megahertz (MHz) repetition rates. An international team of researchers (Germany, USA – University of Michigan) has developed a flexible and scalable scheme for the generation of strong phase-locked THz pulses based on shift currents in type-II-aligned epitaxial semiconductor heterostructures. The measured THz waveforms exhibit only 0.45 optical cycles at their centre frequency within the full width at half maximum of the intensity envelope, peak fields above 1.1 kV cm−1 and spectral components up […]
Category Archives: Quantum information processing
A well-known iron-based magnet is also a potential quantum information material
Phys.org January 13, 2022 For quantum information processing the strongest-performing permanent magnets contain expensive rare-earth metals magnets. Researchers at the Iowa State University scanned vast number of iron-based permanent magnets and established that lanthanum-based hexaferrites show an advantage over conventional samarium-based hexaferrites. They identified LaFe12O19 as an excellent candidate for a gap magnet (iron-based permanent magnet). It is an excellent wide-bandgap semiconductor, can withstand higher voltages, frequencies, and temperatures. They discovered a new quantum state in this material, which strongly locks the magnetization along a fixed direction in the crystal, it could host other rare earths possessing nontrivial localized electronic […]
Trapping spins with sound
Science Daily November 1, 2021 Lattice defects in crystals often come along with certain magnetic properties. To use them as promising systems for applications in quantum technologies an international team of researchers (Germany, Russia) has developed an efficient method to control their spin states using surface acoustic waves (SAW). They demonstrated a giant interaction between the strain field of SAW and the excited-state spin of silicon vacancies in silicon carbide, which is about two orders of magnitude stronger than in the ground state. The simultaneous spin driving in the ground and excited states with the same SAW leads to the […]