Correlation between electronic and structural orders in 1&lt;em&gt;T&lt;/em&gt;-TiSe&lt;sub&gt;2&lt;/sub&gt;

Ueda, Hiroki; Porer, Michael; Mardegan, José R.L.; Parchenko, Sergii; Gurung, Namrata; Fabrizi, Federica; Ramakrishnan, Mahesh; Boie, Larissa; Neugebauer, Martin Josef; Burganov, Bulat; Burian, Max; Johnson, Steven Lee; Rossnagel, Kai; Staub, Urs

doi:10.1103/PhysRevResearch.3.L022003

Correlation between electronic and structural orders in 1T-TiSe₂

Ueda H, Porer M, Mardegan JRL, Parchenko S, Gurung N, Fabrizi F, Ramakrishnan M, Boie L, Neugebauer MJ, Burganov B, Burian M, Johnson SL, Rossnagel K & Staub U

Citation

Ueda, H., Porer, M., Mardegan, J. R. L., Parchenko, S., Gurung, N., Fabrizi, F., … Staub, U. (2021). Correlation between electronic and structural orders in 1T-TiSe₂. Physical Review Research, 3(2), L022003 (6 pp.). https://doi.org/10.1103/PhysRevResearch.3.L022003

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:39322

The correlation between electronic and crystal structures of 1T-TiSe₂ 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.