Valence-band warping in tight-binding models

Boykin, TB Gamble, LJ Klimeck, G Bowen, RC

Tb. Boykin et al., Valence-band warping in tight-binding models, PHYS REV B, 59(11), 1999, pp. 7301-7304

15

INGLESE

Article

Apllied Physucs/Condensed Matter/Materiales Science

PHYSICAL REVIEW B-CONDENSED MATTER

0163-1829 → ACNP

59

11

1999

7301 - 7304

ISI

0163-1829(19990315)59:11<7301:VWITM>2.0.ZU;2-6

The spin-orbit nearest-neighbor sp(3)s* model is widely believed able to re produce accurately the valence bands of most m-V and group-IV semiconductor s, essential for modeling the in-plane dispersion of valence- and inter-ban d quantum heterostructures. To check this belief, we study valence-band war ping in the spin-orbit sp(3)s* model including interactions up to second-ne arest-neighbor, providing exact, analytic formulas for the [110] and [111] light- and heavy-hole masses; Surprisingly, we find that the second-nearest -neighbor model offers significantly more flexibility in fitting these mass es independently of those along [001] than does the nearest-neighbor model. [S0163-1829(99)10007-9].