Abstract
Electron-occupation probabilities during the photon-assisted coherent tunneling through a quantum wire between electrodes are investigated by means of the equation of motion for nonequilibrium Green functions. The equation of motion is numerically solved by the renormalization-group method. Due to the intersubband transitions from off-diagonal matrix elements, electron population inversion appears in general in a wide range of photon frequency, revealing a different mechanism of optical pumping. It is also found that the rotating-wave approximation is invalid when the quasiparticle transition is at resonance with incident light.
| Original language | English |
|---|---|
| Pages (from-to) | R12752-R12755 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 56 |
| Issue number | 20 |
| DOIs | |
| State | Published - 1997 |
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