| 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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Pichler, Thomas
University of Vienna
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (32/32 displayed)
- 2024Temperature dependence of the Raman spectrum of orthorhombic Bi2Se3
- 2022Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubescitations
- 2022Momentum-Dependent Oscillator Strength Crossover of Excitons and Plasmons in Two- Dimensional PtSe2citations
- 2022Momentum-Dependent Oscillator Strength Crossover of Excitons and Plasmons in Two-Dimensional PtSe 2citations
- 2022Molybdenum Release Triggered by Dolomite Dissolutioncitations
- 2021Photothermal synthesis of confined carbynecitations
- 2021In-situ laser annealing as pathway for the metal freesynthesis of tailored nanographenes
- 2021Deciphering the Intense Postgap Absorptions of Monolayer Transition Metal Dichalcogenidescitations
- 2020Ultralong Spin Lifetime in Light Alkali Atom Doped Graphenecitations
- 2019Towards controllable inner chirality in double-walled carbon nanotubescitations
- 2019Metal-Organic Framework Co-MOF-74-Based Host-Guest Composites for Resistive Gas Sensingcitations
- 2019Carbon Nanostructures in Cancer Diagnosis and Therapy
- 2019Position and momentum mapping of vibrations in graphene nanostructurescitations
- 2018Measurement of Optical Excitations in Low-Dimensional Materials by Using a Monochromated Electron Sourcecitations
- 2018Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver chloridecitations
- 2016Environmental control of electron-phonon coupling in barium doped graphenecitations
- 2016Disentangling Vacancy Oxidation on Metallicity-Sorted Carbon Nanotubescitations
- 2015Atomically precise semiconductor-graphene and hBN interfaces by Ge intercalationcitations
- 2014Raman spectroscopy of graphite intercalation compounds: Charge transfer, strain, and electron–phonon coupling in graphene layerscitations
- 2014Raman spectroscopy of graphite intercalation compoundscitations
- 2014Raman spectroscopy of graphite intercalation compounds ; charge transfer, strain, and electron-phonon coupling in graphene layers
- 2013Manifestation of charged and strained graphene layers in the Raman response of graphite intercalation compounds.citations
- 2013Manifestation of Charged and Strained Graphene Layers in the Raman Response of Graphite Intercalation Compoundscitations
- 2013Hybrid Carbon Nanotube Networks as Efficient Hole Extraction Layers for Organic Photovoltaicscitations
- 2011Nitrogen-Doped Single-Walled Carbon Nanotube Thin Films Exhibiting Anomalous Sheet Resistancescitations
- 2011Nanochemical reactions by laser annealing of ferrocene filled single-walled carbon nanotubescitations
- 2010Evidence for substitutional boron in doped single-walled carbon nanotubescitations
- 2009Carbon nanotube synthesis via ceramic catalystscitations
- 2008Tight-binding description of the quasiparticle dispersion of graphite and few-layer graphenecitations
- 2008A one step approach to B-doped single-walled carbon nanotubescitations
- 2006High quality double wall carbon nanotubes with a defined diameter distribution by chemical vapor deposition from alcoholcitations
- 2004Low temperature fullerene encapsulation in single wall carbon nanotubes: Synthesis of N@C60@SWCNTcitations
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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.