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Time-domain classification of charge-density-wave insulators
- Source :
- Nature Communications. 3
- Publication Year :
- 2012
- Publisher :
- Springer Science and Business Media LLC, 2012.
-
Abstract
- Distinguishing insulators by the dominant type of interaction is a central problem in condensed matter physics. Basic models include the Bloch-Wilson and the Peierls insulator due to electron-lattice interactions, the Mott and the excitonic insulator caused by electron-electron interactions, and the Anderson insulator arising from electron-impurity interactions. In real materials, however, all the interactions are simultaneously present so that classification is often not straightforward. Here, we show that time- and angle-resolved photoemission spectroscopy can directly measure the melting times of electronic order parameters and thus identify-via systematic temporal discrimination of elementary electronic and structural processes-the dominant interaction. Specifically, we resolve the debates about the nature of two peculiar charge-density-wave states in the family of transition-metal dichalcogenides, and show that Rb intercalated 1T-TaS(2) is a Peierls insulator and that the ultrafast response of 1T-TiSe(2) is highly suggestive of an excitonic insulator.
- Subjects :
- Condensed Matter::Quantum Gases
Physics
Multidisciplinary
Condensed matter physics
Photoemission spectroscopy
General Physics and Astronomy
Insulator (electricity)
General Chemistry
General Biochemistry, Genetics and Molecular Biology
Condensed Matter::Strongly Correlated Electrons
Time domain
Charge density wave
Temporal discrimination
Ultrashort pulse
Subjects
Details
- ISSN :
- 20411723
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- Nature Communications
- Accession number :
- edsair.doi.dedup.....e2aa7d82ff12c691bb249e747a23d6df