Controlling charge and spin faster than a cycle of light (Prof. R. Huber)
- Datum: 08.07.2014
- Uhrzeit: 12:30 - 12:30
- Vortragende(r): Professor Rupert Huber, Universität Regensburg
- Raum: Herbert Walther Lecture Hall
- Gastgeber: MPQ
Phase-locked few-cycle pulses in the terahertz and mid-infrared spectral
domain in combination with field-sensitive detectors have been able to
monitor these excitations directly with a time resolution faster than an
oscillation period of the carrier wave. Next-generation high-intensity
terahertz sources have now opened the exciting possibility to explore
condensed matter in an unprecedented regime of atomically strong
electric and magnetic terahertz biasing. We show that terahertz fields
of up to 11 GV/m can accelerate electrons in bulk semiconductors to
perform complete Bloch oscillation cycles within half an oscillation
period of the infrared drive field. The concomitant magnetic field
component allows us to control spins in magnetically ordered solids on
the sub-cycle scale. Our experiments challenge latest quantum theories
and spark hope for superfast electronics and magnetic storage devices at
multi-terahertz clock rates.