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Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations | | O. Schubert
; M. Hohenleutner
; F. Langer
; B. Urbanek
; C. Lange
; U. Huttner
; D. Golde
; T. Meier
; M. Kira
; S. W. Koch
; R. Huber
; | | Date: |
13 Apr 2016 | | Abstract: | Ultrafast charge transport in strongly biased semiconductors is at the heart
of highspeed electronics, electro-optics, and fundamental solid-state physics.
Intense light pulses in the terahertz (THz) spectral range have opened
fascinating vistas: Since THz photon energies are far below typical electronic
interband resonances, a stable electromagnetic waveform may serve as a
precisely adjustable bias. Novel quantum phenomena have been anticipated for
THz amplitudes reaching atomic field strengths. We exploit controlled THz
waveforms with peak fields of 72 MV/cm to drive coherent interband polarization
combined with dynamical Bloch oscillations in semiconducting gallium selenide.
These dynamics entail the emission of phase-stable high-harmonic transients,
covering the entire THz-to-visible spectral domain between 0.1 and 675 THz.
Quantum interference of different ionization paths of accelerated charge
carriers is controlled via the waveform of the driving field and explained by a
quantum theory of inter- and intraband dynamics. Our results pave the way
towards all-coherent THz-rate electronics. | | Source: | arXiv, 1604.3732 | | Services: | Forum | Review | PDF | Favorites | |
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