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Title: Optical and vibrational properties of (ZnO){sub k} In{sub 2}O{sub 3} natural superlattice nanostructures

Abstract

A thermodynamically stable series of superlattices, (ZnO){sub k}In{sub 2}O{sub 3}, form in the ZnO-In{sub 2}O{sub 3} binary oxide system for InO{sub 1.5} concentrations from about 13 up to about 33 mole percent (m/o). These natural superlattices, which consist of a periodic stacking of single, two-dimensional sheets of InO{sub 6} octahedra, are found to give rise to systematic changes in the optical and vibrational properties of the superlattices. Low-frequency Raman scattering provides the evidence for the activation of acoustic phonons due to the folding of Brillouin zone. New vibrational modes at 520 and 620 cm{sup −1}, not present in either ZnO or In{sub 2}O{sub 3}, become Raman active. These new modes are attributed to collective plasmon oscillations localized at the two-dimensional InO{sub 1.5} sheets. Infrared reflectivity experiments, and simulations taking into account a negative dielectric susceptibility due to electron carriers in ZnO and interface modes of the dielectric layer of InO{sub 2}, explain the occurrence of these new modes. We postulate that a localized electron gas forms at the ZnO/InO{sub 2} interface due to the electron band alignment and polarization effects. All our observations suggest that there are quantum contributions to the thermal and electrical conductivity in these natural superlattices.

Authors:
 [1]; ; ;  [2];  [3];  [4]
  1. Laboratoire Matériaux Optiques, Photonique et Systèmes, Université de Lorraine et CentraleSupélec, 57070 Metz (France)
  2. Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8 (Czech Republic)
  3. School of Materials Science and Engineering, Changzhou University, Changzhou, Jiangsu Province 213164 (China)
  4. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Maryland 02138 (United States)
Publication Date:
OSTI Identifier:
22596996
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 19; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BRILLOUIN ZONES; CONCENTRATION RATIO; DIELECTRIC MATERIALS; ELECTRIC CONDUCTIVITY; ELECTRON GAS; ELECTRONS; INDIUM OXIDES; INTERFACES; NANOSTRUCTURES; PERIODICITY; PHONONS; PLASMONS; POLARIZATION; RAMAN EFFECT; REFLECTIVITY; SUPERLATTICES; TWO-DIMENSIONAL SYSTEMS; ZINC OXIDES

Citation Formats

Margueron, Samuel, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Maryland 02138, Pokorny, Jan, Skiadopoulou, Stella, Kamba, Stanislav, Liang, Xin, and Clarke, David R. Optical and vibrational properties of (ZnO){sub k} In{sub 2}O{sub 3} natural superlattice nanostructures. United States: N. p., 2016. Web. doi:10.1063/1.4950789.
Margueron, Samuel, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Maryland 02138, Pokorny, Jan, Skiadopoulou, Stella, Kamba, Stanislav, Liang, Xin, & Clarke, David R. Optical and vibrational properties of (ZnO){sub k} In{sub 2}O{sub 3} natural superlattice nanostructures. United States. doi:10.1063/1.4950789.
Margueron, Samuel, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Maryland 02138, Pokorny, Jan, Skiadopoulou, Stella, Kamba, Stanislav, Liang, Xin, and Clarke, David R. Sat . "Optical and vibrational properties of (ZnO){sub k} In{sub 2}O{sub 3} natural superlattice nanostructures". United States. doi:10.1063/1.4950789.
@article{osti_22596996,
title = {Optical and vibrational properties of (ZnO){sub k} In{sub 2}O{sub 3} natural superlattice nanostructures},
author = {Margueron, Samuel and John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Maryland 02138 and Pokorny, Jan and Skiadopoulou, Stella and Kamba, Stanislav and Liang, Xin and Clarke, David R.},
abstractNote = {A thermodynamically stable series of superlattices, (ZnO){sub k}In{sub 2}O{sub 3}, form in the ZnO-In{sub 2}O{sub 3} binary oxide system for InO{sub 1.5} concentrations from about 13 up to about 33 mole percent (m/o). These natural superlattices, which consist of a periodic stacking of single, two-dimensional sheets of InO{sub 6} octahedra, are found to give rise to systematic changes in the optical and vibrational properties of the superlattices. Low-frequency Raman scattering provides the evidence for the activation of acoustic phonons due to the folding of Brillouin zone. New vibrational modes at 520 and 620 cm{sup −1}, not present in either ZnO or In{sub 2}O{sub 3}, become Raman active. These new modes are attributed to collective plasmon oscillations localized at the two-dimensional InO{sub 1.5} sheets. Infrared reflectivity experiments, and simulations taking into account a negative dielectric susceptibility due to electron carriers in ZnO and interface modes of the dielectric layer of InO{sub 2}, explain the occurrence of these new modes. We postulate that a localized electron gas forms at the ZnO/InO{sub 2} interface due to the electron band alignment and polarization effects. All our observations suggest that there are quantum contributions to the thermal and electrical conductivity in these natural superlattices.},
doi = {10.1063/1.4950789},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 19,
volume = 119,
place = {United States},
year = {2016},
month = {5}
}