Seminars & Lectures
| * TITLE | Excitonic Insulator Phase in 1T-TiSe2 | ||||||
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| * DATE / TIME | 2020-06-05, 14:00-15:00 | ||||||
| * ABSTRACT | |||||||
| Sixty years ago, Mott predicted that electron-hole pair may Bose condense into an insulating state, so-called excitonic insulator.(EI) Candidate materials have been suggested, but existence of EI has remained unconfirmed. Many recent works support the EI model of the charge density wave (CDW) state below the critical temperature Tc=200K of 1T-TiSe2. However, one important requirement has remained unproven. Here, we provide material-specific calculations involving Coulomb interaction between electron and hole by solving BCS like exciton gap equation. Without fitting parameter, we obtained T_c=200K for normal state gap of 100meV and the measured doping dependence of T_c. And, calculated spectroscopic features are agree with experiments. Also, we expect that our approach can be applied to other candidate, such as Ta2NiSe5. -Attend the lecture by: ■ On-site You can participate in the seminar directly on-site at seminar room #512 of the Center. ■ Zoom Webinar 1) Click the following link https://us02web.zoom.us/j/86721739669?pwd=UmVrWkc4djJ4TDRodklqWWQzNC9Mdz09 2) Join the webinar with your email account and name Inquiries: ra@apctp.org |
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