Journal article
Photoinduced chiral charge density wave in TiSe2
Physical review. B, v 105(5)
07 Feb 2022
Abstract
1T -TiSe2 has been found to host a chiral charge density wave (CDW). Some studies suggest the microscopic origin of this phase is due to electron-phonon coupling while other studies suggest it is due to an excitonic insulator phase transition based on nonthermal melting of the charge density wave. First, we propose these interpretations can be reconciled if one analyzes the available experimental and theoretical data within a formal definition of what constitutes an excitonic insulator as initially proposed by Keldysh and Kopaev. Next, we present pump-probe measurements of circularly polarized optical transitions and first-principles calculations to highlight the role of elevated electronic temperatures on structural distortions to understand the nonthermal melting of the CDW phase. We also uncover a noncentrosymmetric CDW structure that explains the finite chirality of the optical transitions observed in the CDW phase of TiSe2.
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Details
- Title
- Photoinduced chiral charge density wave in TiSe2
- Creators
- Darshana Wickramaratne - United States Naval Research LaboratorySujan Subedi - Temple UniversityDarius H. Torchinsky - Temple UniversityG. Karapetrov - Drexel UniversityI. I. Mazin - George Mason University
- Publication Details
- Physical review. B, v 105(5)
- Publisher
- Amer Physical Soc
- Number of pages
- 9
- Grant note
- Laboratory-University Collaboration Initiative of the DoD Basic Research Office ECCS-1711015 / NSF; National Science Foundation (NSF) N0001420-1-2345 / ONR; Office of Naval Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000753526300001
- Scopus ID
- 2-s2.0-85124658065
- Other Identifier
- 991019168575904721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter