Details

Autor(en) / Beteiligte

• Železný, V
• Goian, V
• Navrátil, J
• Drašar, Č
• Orlita, M
• Piot, B A
• Prokleška, J
• Míšek, M
• Kaštil, J
• Kamba, S

Titel

Anomalous temperature dependence of the effective mass in p-type Bi2Te3

Ist Teil von

• Physical review. B, 2021-10, Vol.104 (16)

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2021

Quelle

APS: American Physical Society E-Journals (Physics)

Beschreibungen/Notizen

• Infrared reflectance measurements have been carried on highly p-type Bi2Te3 crystals over the broad temperature range from 10 to 650 K and their response function investigated. An anomalous nonmonotonous temperature dependence of the plasma edge frequency is observed-with a pronounced redshift and blueshift that appear above and below room temperature, respectively. Such behavior is explained in terms of the temperature evolution of the free carrier optical weight N/m∗ given by particular temperature dependence of the total carrier concentration N (determined by transport measurements) and characteristic (optical) mass m∗. The effective mass strongly varies from m∗ = 0.1 m0(m0 electron rest mass) at 10 K to m∗ = 0.5 m0 respective m∗ = 0.9 m0 at 650 K depending on the evaluating procedure. The interpretation is corroborated by complementary magnetotransport and magnetoreflectivity experiments.