Short-range phase coherence and origin of the $1T-{\mathrm{TiSe}}_{2}$ charge density wave

• Hildebrand, Baptiste Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Switzerland
• Jaouen, Thomas 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
28.03.2016
Published in:
• Physical Review B. - 2016, vol. 93, no. 12, p. 125140
English The impact of variable Ti self-doping on the 1T−TiSe2 charge density wave (CDW) is studied by scanning tunneling microscopy. Supported by density functional theory, we show that agglomeration of intercalated-Ti atoms acts as preferential nucleation centers for the CDW that breaks up in phase-shifted CDW domains whose size directly depends on the intercalated-Ti concentration and which are separated by atomically sharp phase boundaries. The close relationship between the diminution of the CDW domain size and the disappearance of the anomalous peak in the temperature-dependent resistivity allows to draw a coherent picture of the 1T−TiSe2 CDW phase transition and its relation to excitons.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
• English
Classification
Physics