Excited State Band Mapping and Ultrafast Nonequilibrium Dynamics in Topological Dirac Semimetal 1T-ZrTe2
Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide We performed time- and polarization-resolved extreme ultraviolet momentum microscopy on the topological Dirac semimetal candidate 1T-ZrTe 2 . Excited state band mapping uncovers the previously inaccessible linear dispersion of the Dirac cone above the Fermi level. We study the orbital texture of bands using linear dichroism in photoelectron angular distributions. These observations provide hints about the topological character of 1T-ZrTe 2 . Time-, energy-, and momentum-resolved nonequilibrium carrier dynamics reveal that intra- and interband scattering processes play a major role in the relaxation mechanism, leading to multivalley electron–hole accumulation near the Fermi level. We also show that electrons’ inverse lifetime has a linear dependence as a function of their binding excess energy. Our time- and polarization-resolved XUV photoemission results shed light on the excited state electronic structure of 1T-ZrTe 2 and provide valuable insights into the relatively unexplored field of quantum-state-resolved ultrafast dynamics in 3D topological Dirac semimetals.
Source: Nano Letters
Institutions: Centre National de la Recherche Scientifique, Université de Bordeaux, National Centre of Scientific Research "Demokritos", Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Centre Lasers Intenses et Applications, Institute of Nanoscience and Nanotechnology, Aristotle University of Thessaloniki
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4403280086