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Title: Temperature-driven band inversion in Pb 0.77 Sn 0.23 Se : Optical and Hall effect studies

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [1];  [1];  [1];  [2];  [2];  [1];  [1];  [3];  [4]
  1. Univ. of Florida, Gainesville, FL (United States)
  2. Florida State Univ., Tallahassee, FL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Ramapo College, Mahwah, NJ (United States)

Optical and Hall-effect measurements have been performed on single crystals of Pb₀.₇₇Sn₀.₂₃Se, a IV-VI mixed chalcogenide. The temperature dependent (10–300 K) reflectance was measured over 40–7000 cm⁻¹ (5–870 meV) with an extension to 15,500 cm⁻¹ (1.92 eV) at room temperature. The reflectance was fit to the Drude-Lorentz model using a single Drude component and several Lorentz oscillators. The optical properties at the measured temperatures were estimated via Kramers-Kronig analysis as well as by the Drude-Lorentz fit. The carriers were p-type with the carrier density determined by Hall measurements. A signature of valence intraband transition is found in the low-energy optical spectra. It is found that the valence-conduction band transition energy as well as the free carrier effective mass reach minimum values at 100 K, suggesting temperature-driven band inversion in the material. Thus, density function theory calculation for the electronic band structure also make similar predictions.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704; AC02-98CH10886
OSTI ID:
1182520
Alternate ID(s):
OSTI ID: 1179976
Report Number(s):
BNL-107518-2015-JA; PRBMDO; R&D Project: PO010; KC0201060
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 23; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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