Abstract
The ultrafast interplay between charge and lattice in correlated electron systems often leads to spontaneous collective order. The charge density wave (CDW) in 1T-TiSe2 (Tc ≈ 200 K) represents a prominent reference. The microscopic driving mechanism has been a topic of a long-standing debate, promoting a Jahn-Teller effect, an excitonic origin, or a crossover of both. Time-resolved optical reflectivity, x-ray diffraction [1] and photo-emission [2] studies offer elegant means to separate various degrees of freedom via their intrinsic dynamics.
© 2013 IEEE
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