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--- lab:research:gaassb [2014/11/09 01:21]
127.0.0.1 external edit
+++ lab:research:gaassb [2014/12/17 09:08]
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 ==== Optical properties of GaAsSb ====
-Using [[wp>GW_approximation|GW approximation]], we have calculated
+It is very important to understand the electronic structure of
-quasiparticle band structure of
+GaAs and GaSb for fabrication of electronic and optoelectronic
-GaAs<sub>1-//x//</sub>Sb<sub>//x//</sub>. blah blah
+devices. Recently, tenary compounds, GaAs<sub>1-//x//</sub>Sb<sub>//x//</sub>
+began to attract much attention from researchers because they
+were synthesized and expected to be new materials for optoeletronic
+devices. For //x// = 1 and //x// = 0, there have been a lot of computational
+studies to investigate their structural, electronic and optical
+properties, but few studies for general cases. Moreover, it has
+been known that “regular” density functional calculations does not
+describe the correct electronic structures including underestimated
+band gap and incorrect band splitting. To resolve such issues, we
+consider spin-orbit coupling effects and GW corrections on GaAs<sub>1-//x//</sub>Sb<sub>//x//</sub>
+with the composition of //x// = 0, 0.25, 0.5, 0.75, and 1. To
+calculate their band structures, we make use of maximally
+localized Wannier functions to interpolate GW quasiparticle
+band structures. Based on our GW[[wp>GW_approximation|GW approximation]]
+calculations, we discuss the trend of band gaps at various high
+symmetric points in the Brillouin zone with the composition //x//.

Kwon Group, Physics, Kyung Hee University

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