Charge density wave hampers exciton condensation in 1T-TiSe2

Lian, Chao; Ali, Zulfikhar A.; Wong, Bryan M.

doi:10.1103/physrevb.100.205423

Title: Charge density wave hampers exciton condensation in 1T-TiSe₂

Journal Article · 24 November 2019 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.100.205423 · OSTI ID:1802907

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Univ. of California, Riverside, CA (United States); OSTI
Univ. of California, Riverside, CA (United States)

The Bose-Einstein condensation of excitons continues to garner immense attention as a prototypical example for observing emergent properties from many-body quantum effects. In particular, titanium diselenide (TiSe₂) is a promising candidate for realizing exciton condensation and was experimentally observed only very recently. Surprisingly, the condensate was experimentally characterized by a soft plasmon mode that only exists near the transition temperature $$T_c$$ of the charge density wave (CDW). Here, we characterize and analyze the experimental spectra using linear-response time-dependent density functional theory and find that the soft mode can be attributed to interband electronic transitions. At the CDW state below $$T_c$$, the periodic lattice distortions hamper the spontaneous formation of the exciton by introducing a CDW gap. In this work, the band gap raises the soft mode and merges it into the regular plasmon. Our surprising results contradict previous simplistic analytical models commonly used in the scientific literature. In addition, we find that a finite electronic temperature $$T_e$$ introduces a dissipation channel and prevents the condensation above $$T_c$$. The combined effect of the CDW and $$T_e$$ explains the fragile temperature dependence of the exciton condensation. Taken together, our work provides the first ab initio atomic-level framework for rationalizing recent experiments and further manipulating exciton condensates in TiSe₂.

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Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0016269

OSTI ID:: 1802907

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 20 Vol. 100; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Charge density wave hampers exciton condensation in 1T-TiSe2

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Title: Charge density wave hampers exciton condensation in 1T-TiSe₂