ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT wigner.mta.hu>]

WIGNER SZFI SZEMINÁRIUM SÁRI JUDIT

(PTE, BME-MTA EKF Lendület csoport)
"Making visible relativistic covariance in graphene and alpha-(BEDT-TTF)2I3"

Időpont: 2015. március 17. (kedd) 10:00 (1 óra)
Hely: MTA Wigner FK SZFI, I. épület 1. emeleti Tanácsterem
Összefoglaló:
Massless Dirac fermions occur as low-energy modes in several
quasi-two-dimensional condensed matter systems such as graphene, the
surface of bulk topological insulators, and in layered organic
semiconductors. We bring advancement in the Lorentz-invariant description
of these systems, and derive magneto-optical properties when the rotational
symmetry of the system is broken either by an in-plane electric field or
the tilt of the Dirac cones. The reduced symmetry in such systems makes the
allowed dipolar optical transitions evolve into a fan of interband
transitions. Exploiting the Lorentz covariance of the low-energy carriers,
we analyze the emerging optical properties, and predict that infrared
absorption spectra yield quantitative information on the tilted Dirac cone
structure in organic compounds such as alpha-(BEDT-TTF)2I3.

*Részletes információ:* http://www.szfki.hu/seminar
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Asbóth János
szfi-seminar AT wigner.mta.hu