Abstract
We study the electronic state of the organic conductor α-(BEDT-TSeF)2I3 (BETS) in which a zero-gap state (ZGS) of massless Dirac fermions is expected under pressure. A transition from an insulating state to a ZGS is investigated using an extended Hubbard model with seven kinds of transfer energy between the four molecules A, A′ (= A), B, and C per unit cell and with the interaction terms, namely, on-site and nearest-neighbor Coulomb interactions, and an anion potential. From the analysis of the change in the transfer energies, we find that the transfer energies along the stacking axis play an important role in stabilizing the ZGS. The inclusion of the renormalization effect of the transfer energies, which arises from the Fock mean fields, is crucial to understanding the appearance of the ZGS under high pressure. We present the phase diagram that is obtained by including this renormalization effect.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
