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Probing the exciton condensate phase in 1T-TiSe2 with photoemission
- Source :
- New Journal of Physics, New Journal of Physics, Institute of Physics: Open Access Journals, 2010, 12, pp.125019. ⟨10.1088/1367-2630/12/12/125019⟩
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Abstract
- International audience; We present recent results obtained using angle-resolved photoemission spectroscopy performed on 1T-TiSe2. Emphasis is put on the peculiarity of the bandstructure of TiSe2 compared to other transition metal dichalcogenides, which suggests that this system is an excellent candidate for the realization of the excitonic insulator phase. This exotic phase is discussed in relation to the BCS theory, and its spectroscopic signature is computed via a model adapted to the particular bandstructure of 1T-TiSe2. A comparison between photoemission intensity maps calculated with the spectral function derived for this model and experimental results is shown, giving strong support for the exciton condensate phase as the origin of the charge density wave transition observed in 1T-TiSe2. The temperature-dependent order parameter characterizing the exciton condensate phase is discussed, both on a theoretical and an experimental basis, as well as the chemical potential shift occurring in this system. Finally, the transport properties of 1T-TiSe2 are analyzed in the light of the photoemission results.
- Subjects :
- Physics
Condensed Matter::Quantum Gases
Liquid
Condensed matter physics
Photoemission spectroscopy
Exciton
Inverse photoemission spectroscopy
General Physics and Astronomy
Charge density
Angle-resolved photoemission spectroscopy
BCS theory
Band-Structure
01 natural sciences
010305 fluids & plasmas
Condensed Matter::Materials Science
0103 physical sciences
Condensed Matter::Strongly Correlated Electrons
Insulator
[PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
010306 general physics
Electronic band structure
Charge density wave
Tise2
Subjects
Details
- ISSN :
- 13672630
- Database :
- OpenAIRE
- Journal :
- New Journal of Physics, New Journal of Physics, Institute of Physics: Open Access Journals, 2010, 12, pp.125019. ⟨10.1088/1367-2630/12/12/125019⟩
- Accession number :
- edsair.doi.dedup.....6bde2d7ad0bf0eaf60fc5341993f00e5