Potential profile for type-I and type-II alignment with graded interfaces. The vertical lines indicate the limits of interfacial regions.
(a) Binding energy and (b) total exciton energy of excitons in type-I QW as a function of the well width, using a 2D-like trial function and considering interface thickness of (solid line), (dotted line), (dashed line), and (dashed-dotted line).
(a) Stark shift (solid line, square symbol), binding energy (dashed line, circle symbol), and total exciton energy (dotted line, triangle symbol) shifts as functions of the applied electric field, in type-I QW, considering abrupt (lines) and graded interfaces of thickness (symbols). (b) Exciton energy shift due to an electric field as a function of the QW width, considering interfaces thickness of (solid line) and (dotted line).
Absolute values of the binding energies of type-II excitons in abrupt QW as a function of the QW width, for 2D (dotted line) and 3D (solid line) trial functions.
(a) Absolute values of the binding energy and (b) total exciton energy of excitons in type-II QW as a function of the QW width, using a 3D-like trial function and considering interface thickness of (solid line), (dotted line), (dashed line), and (dashed-dotted line).
Total exciton energy shift as a function of the electric field in type-II QW, for a well width of , considering abrupt (solid line) and (dotted line) interfaces, for applied magnetic field and .
Total exciton energy shifts as a function of the magnetic field , for type-I (solid) and type-II QWs with 2D (dotted line) and 3D (dashed line) approximations, and a abrupt QW.
Representation of the probability density distributions for a type-II wide abrupt QW, considering (a) and (b) , within the 2D approach. (c) and (d) are the results for the same magnetic fields, being considered a 3D-like trial function.
Material parameters for strain calculations in wells (Refs. 10, 17, and 32).
Selected properties of Si and Ge, which are used to obtain values for by linear interpolation (Refs. 10, 19, and 33).
Article metrics loading...
Full text loading...