Doping nature of native defects in 1T−TiSe₂

Hildebrand, Baptiste; Didiot, Clément; Novello, A. M.; Monney, Gaël; Scarfato, A.; Ubaldini, A.; Berger, Helmuth; Bowler, D. R.; Renner, Christoph; Aebi, Philipp

doi:10.1103/PhysRevLett.112.197001

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Journal article

Doping nature of native defects in 1T−TiSe₂

Hildebrand, Baptiste Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Didiot, Clément Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Novello, A. M. Département de Physique de la Matière Condensée, University of Geneva, Switzerland
Monney, Gaël Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
Scarfato, A. Département de Physique de la Matière Condensée, University of Geneva, Switzerland
Ubaldini, A. Département de Physique de la Matière Condensée, University of Geneva, Switzerland
Berger, Helmuth Institut de Génie Atomique, Ecole Polytechnique Fédérale de Lausanne, Switzerland
Bowler, D. R. London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, UK
Renner, Christoph Département de Physique de la Matière Condensée, University of Geneva, Switzerland
Aebi, Philipp Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland

14.05.2014

Published in:

Physical Review Letters. - 2014, vol. 112, no. 19, p. 197001

English The transition-metal dichalcogenide 1T−TiSe₂is a quasi-two-dimensional layered material with a charge density wave (CDW) transition temperature of TCDW≈200 K. Self-doping effects for crystals grown at different temperatures introduce structural defects, modify the temperature-dependent resistivity, and strongly perturbate the CDW phase. Here, we study the structural and doping nature of such native defects combining scanning tunneling microscopy or spectroscopy and ab initio calculations. The dominant native single atom dopants we identify in our single crystals are intercalated Ti atoms, Se vacancies, and Se substitutions by residual iodine and oxygen.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language