| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Muñoz, Alfonso
Universidad de Cantabria
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024Role of GdO addition in the structural stability of cubic Gd2O3 at high pressures: Determination of the equation of states of GdO and Gd2O3citations
- 2024Experimental and Theoretical Study of Sc2O3 Nanoparticles Under High Pressure
- 2024Temperature dependence of the Raman spectrum of orthorhombic Bi2Se3
- 2018An ultrahigh CO₂-loaded silicalite-1 zeolite: structural stability and physical properties at high pressures and temperaturescitations
- 2016Beta-Bi2O3 under compression: Optical and elastic properties and electron density topology analysiscitations
- 2016High-pressure crystal structure, lattice vibrations, and band structure of BiSbO4citations
- 2015Isostructural Second-Order Phase Transition of β-Bi2O3 at High Pressures: An Experimental and Theoretical Studycitations
- 2015Exploring the high-pressure behavior of the three known polymorphs of BiPO4: Discovery of a new polymorphcitations
- 2014Structural study of α-Bi2O3 under pressurecitations
- 2014Isostructural second-order phase transition of b-Bi2O3 at high pressures: an experimental and theoretical studycitations
- 2014Pressure effects on the vibrational properties of alpha-Bi2O3: an experimental and theoretical studycitations
- 2013Vibrational study of HgGa2S4 under high pressurecitations
- 2013Structural study of alpha-Bi2O3 under pressurecitations
Places of action
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document
Temperature dependence of the Raman spectrum of orthorhombic Bi2Se3
Abstract
Bismuth selenide, a benchmark topological insulator, grows in a trigonal structure at ambient conditions and exhibits a number of enticing properties related to the formation of Dirac surface states. Besides this polytype, a metastable orthorhombic modification with Pnma space group has been produced by electrodeposition and high-pressure high-temperature synthesis displaying upon Sb doping significant thermoelectric properties in the midtemperature range. However, very little experimental information is available on the fundamental properties of this polytype, such as, e.g., the electronic band gap and the lattice dynamics. We report here the temperature dependence of the Raman spectra of orthorhombic Bi2Se3 between 10 K and 300 K, which displays an anharmonic behavior of the optical phonons that can be modelled with a two-phonon decay channel. In order to analyze the data we performed ab initio calculations of the electronic bandstructure, the phonon frequencies at the center of the Brillouin zone, and the phonon dispersion relations along the main symmetry directions, examining the effect of spin-orbit coupling in both phonon and electronic energies. Lastly, we report here cathodoluminescence experiments at 83 K that set a lower limit to the electronic bandgap at 0.835 eV, pointing to an indirect nature, in agreement with our calculations. These results shed light to essential properties of orthorhombic Bi2Se3 for further understanding of the potential of this semiconductor for thermoelectrics and new applications.