Anomalous anisotropic exciton temperature dependence in rutile ${\mathrm{TiO}}_{2}$
- Baldini, Edoardo Laboratory of Ultrafast Spectroscopy, ISIC and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, Switzerland
- Dominguez, Adriel Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
- Chiodo, Letizia Unit of Nonlinear Physics and Mathematical Modeling, Department of Engineering, Università Campus Bio-Medico di Roma, Italy
- Sheveleva, Evgeniia Department of Physics, University of Fribourg, Switzerland
- Yazdi-Rizi, Meghdad Department of Physics, University of Fribourg, Switzerland
- Bernhard, Christian Department of Physics, University of Fribourg, Switzerland
- Rubio, Angel Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany - Departamento Física de Materiales, Universidad del País Vasco, San Sebastián, Spain
- Chergui, Majed Laboratory of Ultrafast Spectroscopy, ISIC and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, Switzerland
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19.07.2017
Published in:
- Physical Review B. - 2017, vol. 96, no. 4, p. 041204
English
Elucidating the details of electron-phonon coupling in semiconductors and insulators is a topic of pivotal interest, as it governs the transport mechanisms and is responsible for various phenomena such as spectral-weight transfers to phonon sidebands and self-trapping. Here, we investigate the influence of the electron-phonon interaction on the excitonic peaks of rutile TiO2, revealing a strong anisotropic polarization dependence with increasing temperature, namely, an anomalous blue shift for light polarized along the a axis and a conventional red shift for light polarized along the c axis. By employing many-body perturbation theory, we identify two terms in the electron-phonon interaction Hamiltonian that contribute to the anomalous blue shift of the a-axis exciton. Our approach paves the way to a complete ab initio treatment of the electron-phonon interaction and of its influence on the optical spectra of polar materials.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 305125
- DOI 10.1103/PhysRevB.96.041204
- Persistent URL
- https://folia.unifr.ch/unifr/documents/306044
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