Correlation between electronic and structural orders in 1T-TiSe_{2}

• Published in: Physical review research Vol. 3; no. 2; p. L022003
• Main Authors: Hiroki Ueda, Michael Porer, José R. L. Mardegan, Sergii Parchenko, Namrata Gurung, Federica Fabrizi, Mahesh Ramakrishnan, Larissa Boie, Martin Josef Neugebauer, Bulat Burganov, Max Burian, Steven Lee Johnson, Kai Rossnagel, Urs Staub
• Format: Journal Article
• Language: English
• Published: American Physical Society 01.04.2021
• ISSN: 2643-1564
• DOI: 10.1103/PhysRevResearch.3.L022003

The correlation between electronic and crystal structures of 1T-TiSe_{2} in the charge-density wave (CDW) state is studied by x-ray diffraction in order to clarify basic properties in the CDW state, transport properties, and chirality. Three families of reflections are used to probe atomic displacements and the orbital asymmetry in Se. Two distinct onset temperatures are found: T_{CDW} and a lower T^{*} indicative for an onset of Se out-of-plane atomic displacements. T^{*} coincides with a DC resistivity maximum and the onset of the proposed gyrotropic (chiral) electronic structure. However, no indication for chirality is found. The relation between the atomic displacements and the transport properties is discussed in terms of Ti 3d and Se 4p states that only weakly couple to the CDW order.