Journal
PHYSICAL REVIEW B
Volume 104, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.165203
Keywords
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Funding
- Czech Science Foundation [21-06802S, 19-16315S]
- Operational Programme Research, Development and Education ( European Structural and Investment Funds)
- Operational Programme Research, Development and Education (Czech Ministry of Education, Youth and Sports)
- Program of Czech Research Infrastructures [LM2018096]
- [SOLID21 (CZ.02.1.01/0.0/0.0/16|019/0000760)]
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Infrared reflectance measurements were conducted on highly p-type Bi2Te3 crystals over a wide temperature range. An anomalous nonmonotonous temperature dependence of the plasma edge frequency was observed, with a pronounced redshift and blueshift above and below room temperature. This behavior is explained by the temperature evolution of the free carrier optical weight N/m*, which is determined by the total carrier concentration and characteristic mass. The interpretation is supported by complementary magnetotransport and magnetoreflectivity experiments.
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* = 0.1m0 (m0 electron rest mass) at 10 K to m* = 0.5m0 respective m* = 0.9m0 at 650 K depending on the evaluating procedure. The interpretation is corroborated by complementary magnetotransport and magnetoreflectivity experiments.
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