| DUBROKA, Adam, Ondřej CAHA, Miloš HRONČEK, Pavel FRIŠ, Milan ORLITA, Václav HOLÝ, H. STEINER, Günther BAUER, Günter SPRINGHOLZ a Josef HUMLÍČEK. Interband absorption edge in the topological insulators Bi-2(Te1-xSex)(3). Physical Review B. College PK, MD USA: AMER PHYSICAL SOC, 2017, roč. 96, č. 23, s. "235202-1"-"235202-10", 10 s. ISSN 2469-9950. Dostupné z: https://dx.doi.org/10.1103/PhysRevB.96.235202. |
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@article{1403957,
author = {Dubroka, Adam and Caha, Ondřej and Hronček, Miloš and Friš, Pavel and Orlita, Milan and Holý, Václav and Steiner, H. and Bauer, Günther and Springholz, Günter and Humlíček, Josef},
article_location = {College PK, MD USA},
article_number = {23},
doi = {http://dx.doi.org/10.1103/PhysRevB.96.235202},
keywords = {BISMUTH TELLURIDE; BI2SE3; SURFACE; BI2TE3; CRYSTALS; N-BI2SE3; SELENIDE; ALLOYS; STATES},
language = {eng},
issn = {2469-9950},
journal = {Physical Review B},
title = {Interband absorption edge in the topological insulators Bi-2(Te1-xSex)(3)},
volume = {96},
year = {2017}
}
TY - JOUR
ID - 1403957
AU - Dubroka, Adam - Caha, Ondřej - Hronček, Miloš - Friš, Pavel - Orlita, Milan - Holý, Václav - Steiner, H. - Bauer, Günther - Springholz, Günter - Humlíček, Josef
PY - 2017
TI - Interband absorption edge in the topological insulators Bi-2(Te1-xSex)(3)
JF - Physical Review B
VL - 96
IS - 23
SP - "235202-1"-"235202-10"
EP - "235202-1"-"235202-10"
PB - AMER PHYSICAL SOC
SN - 24699950
KW - BISMUTH TELLURIDE
KW - BI2SE3
KW - SURFACE
KW - BI2TE3
KW - CRYSTALS
KW - N-BI2SE3
KW - SELENIDE
KW - ALLOYS
KW - STATES
N2 - We have investigated the optical properties of thin films of topological insulators Bi2Te3, Bi2Se3, and their alloys Bi-2(Te1-x Se-x)(3) on BaF2 substrates by a combination of infrared ellipsometry and reflectivity in the energy range from 0.06 to 6.5 eV. For the onset of interband absorption in Bi2Se3, after the correction for the Burstein-Moss effect, we find the value of the direct band gap of 215 +/- 10 meV at 10 K. Our data support the picture that Bi2Se3 has a direct band gap located at the Gamma point in the Brillouin zone and that the valence band reaches up to the Dirac point and has the shape of a downward-oriented paraboloid, i.e., without a camel-back structure. In Bi2Te3, the onset of strong direct interband absorption at 10 K is at a similar energy of about 200 meV, with a weaker additional feature at about 170 meV. Our data support the recent GW band-structure calculations suggesting that the direct interband transition does not occur at the Gamma point but near the Z-F line of the Brillouin zone. In the Bi-2(Te1-x Se-x)(3) alloy, the energy of the onset of direct interband transitions exhibits a maximum near x = 0.3 (i.e., the composition of Bi2Te2Se), suggesting that the crossover of the direct interband transitions between the two points in the Brillouin zone occurs close to this composition.
ER -
DUBROKA, Adam, Ondřej CAHA, Miloš HRONČEK, Pavel FRIŠ, Milan ORLITA, Václav HOLÝ, H. STEINER, Günther BAUER, Günter SPRINGHOLZ a Josef HUMLÍČEK. Interband absorption edge in the topological insulators Bi-2(Te1-xSex)(3). \textit{Physical Review B}. College PK, MD USA: AMER PHYSICAL SOC, 2017, roč.~96, č.~23, s.~''235202-1''-''235202-10'', 10 s. ISSN~2469-9950. Dostupné z: https://dx.doi.org/10.1103/PhysRevB.96.235202.
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