Author/Authors :
E Schomburg، نويسنده , , S Brandl، نويسنده , , S. Winnerl، نويسنده , , K.F. Renk، نويسنده , , N.N. Ledentsov 1، نويسنده , , V.M Ustinov، نويسنده , , A Zhukov، نويسنده , , P.S Kopʹev، نويسنده , , H. -W. Hubers، نويسنده , , J Schubert، نويسنده , , H.P R?ser، نويسنده , , A Rosenauer، نويسنده , , D Litvinov، نويسنده , , D Gerthsen، نويسنده , , J.M Chamberlain، نويسنده ,
Abstract :
We report on the observation of miniband transport in a GaAs/AlAs superlattice with AlAs barrier layers of submonolayer thickness. The current–voltage characteristic of the superlattice at static electric fields showed a negative differential conductance, which is related to miniband electrons performing Bloch oscillations. Under the influence of a THz field, the current through the superlattice was reduced due to a dynamic localisation of the miniband electrons. Our results showed that the novel superlattice can be used as THz detector with a dynamic range of six orders of magnitude and with a responsivity of 0.2 V/W.
