Band structure and optical anisotropy in V-shaped and T-shaped semiconductor quantum wires

ar X iv : c on d - m at / 9 61 22 51 v 1 3 1 D ec 1 99 6 Band structure and optical anisotropy in V - shaped and T - shaped semiconductor quantum wires

We present a theoretical investigation of the electronic and optical properties of V-and T-shaped quantum wires. Valence band mixing as well as realistic sample geometries are fully included through an accurate and efficient approach that is described here in detail. We investigate the resulting valence band structure, which shows some significant peculiarities, such as an anomalously large spi...

Onion slice shaped assembled ZnS quantum wires.

Ultra-narrow wurtzite ZnS quantum wires assembled towards an onion slice shape are synthesized in water using a simple hydrothermal procedure. Wires are formed through an oriented attachment mechanism from wurtzite ZnS spherical particles. Strong confinement effect originated from the narrow width was observed and holds promise for use in broad optoelectronic device application.

Atomistic description of the electronic structure of T-shaped quantum wires

We use an atomistic tight-binding theory to study arrays of T-shaped GaAs/AlGaAs quantum wires. An atomistic approach allows us to provide a theory of the electron and hole states in T shaped wires without the approximations that limit effective mass models. We calculate the band structure of electron and holes in periodic T-wire arrays and in arm wells and compare with the results of effective...

Valley splitting in V-shaped quantum wells

The valley splitting senergy difference between the states of the lowest doubletd in strained silicon quantum wells with a V-shaped potential is calculated variationally using a two-band tight-binding model. The approximation is valid for a moderately long sapproximately 5.5–13.5 nmd quantum well with a V-shaped potential which can be produced by a realistic delta-doping on the order of nd<10 c...

Spatially Varied Flow Profiles in a V-Shaped Side-Channel