Abstract
The role of graded interfaces between materials in a cylindrical
free-standing quantum wire with longitudinal heterostructures is
theoretically investigated by solving the Schrodinger equation within
the effective-mass approximation. Previous works on such wires with
abrupt interfaces have predicted that, as the wire radius is reduced,
the effective potential along the growth direction is altered and might
lead to a carrier confinement at the barriers, as in a type-II system.
Our results show that when graded interfaces are considered, such
potential acquires a peculiar form, which presents cusps at the
interfacial regions yielding to electron confinement at interfaces.
Numerical results also show that, in some special cases, interfacial
confinement and type-I to type-II transitions can also be induced by
applying a magnetic field parallel to the wire axis.
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