Anomalous temperature dependence of the effective mass inp-typeBi2Te3,Physical Review B

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Anomalous temperature dependence of the effective mass inp-typeBi2Te3
Physical Review B ( IF 3.2 ) Pub Date : 2021-10-25 , DOI: 10.1103/physrevb.104.165203
V. Železný ₁ , V. Goian ₁ , J. Navrátil _{2,

3} , Č. Drašar ₂ , M. Orlita _{4,

5} , B. A. Piot ₄ , J. Prokleška ₆ , M. Míšek ₃ , J. Kaštil ₃ , S. Kamba ₁

Affiliation

Infrared reflectance measurements have been carried on highly

p

-type

{Bi}_{2} {Te}_{3}

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 m_{0}

(

m_{0}

electron rest mass) at 10 K to

m^{*} = 0.5 m_{0}

respective

m^{*} = 0.9 m_{0}

at 650 K depending on the evaluating procedure. The interpretation is corroborated by complementary magnetotransport and magnetoreflectivity experiments.

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