Miniband electronic structure of quantum dash array

Abstract

In the paper, we investigate the miniband structure of one-dimensional quantum dash array and its dependence on geometrical parameters by using a newly developed and efficient numerical method. We show that miniband energy significantly depends on the dash height and width, while the miniband width depends on the array period and the dash width. The excited minibands may exhibit the effect of zero miniband gap and the multiple anticrossings, which are followed by the swapping of the character of adjacent minibands top and bottom. The wetting layer allows formation of a miniband cluster in the vicinity of the well top, which essentially represents the barrier continuum embedded into the well of array.