Recently, the concept of the terahertz bosonic cascade laser (BCL) based on a parabolic quantum well (PQW) embedded in a microcavity was proposed. We refine this proposal by suggesting transitions between indirect exciton (IX) states as a source of terahertz emission. We explicitly propose a structure containing a narrow-square QW and a wide parabolic QW for the realisation of a bosonic cascade. Advantages of this type of structures are in large dipole matrix elements for terahertz transitions and in long exciton radiative lifetimes which are crucial for realisation of threshold and quantum efficiency BCLs. (C) 2017 Published by Elsevier Ltd.
机构:
Russian Quantum Ctr, Skolkovo 143025, Moscow Region, Russia
AG & NG Stoletov Vladimir State Univ VSU, 87 Gorki St, Vladimir 600000, RussiaCNR, SPIN, Viale Politecn 1, I-00133 Rome, Italy