Terahertz-photon-modified magnetotransport in a semiconductor in Voigt geometry

Abstract

We present a theoretical study of transport and optical properties of a semiconductor-based electron gas subjected simultaneously to quantizing magnetic fields and intense terahertz ͑THz͒ laser fields in Voigt geometry. It is found that the presence of the THz radiation can result in an enhanced magnetophonon resonance effect and a resonant-absorption peak can be observed at about f ϳ1 THz for GaAs in high magnetic fields. The results are pertinent to experiments where THz free-electron lasers are employed as intense radiation sources.

Plasmon-polaritons for a nanotube in an intense terahertz field

“…Tunable narrow-band continuous-wave [1][2][3][4][5] and pulsed [6][7][8][9][10][11][12] THz radiation has been applied in experimental studies of imaging [13][14][15][16] of biological tissue and supercurrent distribution as well as time-domain spectroscopy [17]. Several interesting THz phenomena have also been investigated such as resonant tunneling and bistability in a double-barrier semiconductor structure [18], resonant absorption [19], the temperature dependence of optical and electronic properties [20], carrier dynamics [21], surface waves [22] and plasmons [23], the manipulation of quantum bits [24], nonlinear THz oscillations in a semiconductor superlattice [25], plasma instability [26], responses of intrinsic Josephson junctions in high-T c superconductors [27] and THz photon modified magnetotransport in semiconductors [28]. Carbon nanotubes, on the other hand, have been investigated for their plasma excitations [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]…”