Abstract
We report the observation of terahertz emission from (Formula presented) thin films excited by 1.5-eV, 150-fs pulses in the absence of external electric or magnetic fields. This emission is characterized for optimally doped (Formula presented) films and underdoped (Formula presented) films, over a range of temperatures T, (Formula presented) where the films change from superconductors to correlated metals. It exhibits a pronounced 4φ dependence with respect to the azimuthal angle φ. We demonstrate that this emission is generated by optical rectification due to the bulk electric quadrupole and magnetic dipole source terms. A model of this emission, assuming that the nonlinearity results from transport of carriers with different masses and relaxation times in the three crystallographic directions, is consistent with the data. A fit of the data to this model yields values for the anisotropic masses and relaxation times in (Formula presented) thin films.
| Original language | English |
|---|---|
| Pages (from-to) | 13633-13638 |
| Number of pages | 6 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 61 |
| Issue number | 20 |
| DOIs | |
| State | Published - Jan 1 2000 |
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