Picosecond time-resolved cyclotron resonance in semiconductors

Abstract

A promising method for studying intraband carrier dynamics in semiconductors is monitoring the evolution of far-infrared ͑FIR͒ absorption induced by photoexcited carriers. By monitoring the photoinduced FIR absorption as a function of magnetic field, we performed time-resolved cyclotron resonance of photocreated electrons in InSb with picosecond resolution.

Terahertz magnetospectroscopy of transient plasmas in semiconductors

“…This unique ability makes it a powerful tool for providing insight into how optically created nonequilibrium electron-hole pairs lose their excess energies while relaxing toward the band edge through various scattering and thermalization processes before eventually recombining to luminesce. 26 In our previous work, 9,10 GaAs at different NIR intensities and magnetic fields. Our calculations based on a Drude conductivity with n(t) and (t) reproduced the main observed features.…”

“…In particular, farinfrared ͑FIR͒/THz pulses can directly probe low-energy dynamics in bulk and quantum-confined semiconductors, e.g., cyclotron resonance ͑CR͒, [5][6][7][8][9][10][11] internal transitions of shallow donors 12,13 and excitons, 14 -16 phonons, 17,18 and intersubband transitions. [19][20][21][22][23] In addition, small photon energies enhance the ponderomotive potential energy 16,24 while precluding interband absorption and sample damage, leading to the possibility of extreme nonlinear optical behavior in semiconductors.…”

Ultrafast and Nonlinear Spectroscopy of Solids with Small Energy Photons

“…The advent of long-wavelength coherent sources, such as free-electron lasers (FELs), 1) optical parametric amplifiers (OPAs), 2) and Terahertz (THz) antennas, 3) has created a new class of opportunities to study small-energy phenomena in solids in the time domain and/or high-intensity regimes. In particular, far-infrared (FIR) pulses can directly excite lowenergy dynamics in bulk and quantum-confined semiconductors, e.g., cyclotron resonance (CR), [4][5][6][7][8][9] internal transitions of shallow donors [10][11][12] and excitons, [13][14][15] phonons, 16,17) and intersubband transitions. [18][19][20][21][22] In addition, small photon energies enhance the ponderomotive potential energy 15,23) while minimizing interband absorption and sample damage, leading to extreme nonlinear optical behavior in semiconductors.…”

Rapid scanning terahertz time-domain magnetospectroscopy with a table-top repetitive pulsed magnet

“…5 However, there has been only limited success in combining THz time-domain spectroscopy (THz-TDS) techniques with high magnetic fields. [6][7][8][9][10][11][12][13][14][15] In particular, combining THz-TDS with a pulsed magnet remains to be a significant technical challenge, 9,13,15 while magnetic fields stronger than 45 T can be generated only in pulsed form. 16 The traditional method for measuring a THz timedomain waveform generated using ultrashort laser pulses includes using a pump-probe scheme where one laser beam passes a beam splitter to make two synchronized pulses from one source.…”