TY - JOUR T1 - EVIDENCE FOR POPULATION-INVERSION IN EXCITED ELECTRON-STATES OF A DOUBLE-BARRIER RESONANT-TUNNELING STRUCTURE JO - APPL PHYS LETT PY - 1994/05/02 AU - COCKBURN JW AU - SKOLNICK MS AU - WHITTAKER DM AU - BUCKLE PD AU - WILLCOX ARK AU - SMITH GW ED - VL - 64 IS - 18 SP - 2400 EP - 2402 Y2 - 2024/12/23 ER -