The exciting story of TiSe2

In this story of TiSe2, experiment and theory meet to provide an explanation for a long-standing enigma. In this system, the electrons rearrange themselves spontaneously at low temperature, resulting in a new periodicity from that of the original lattice. This phase change is driven by a decrease in the total energy of the system. However, the nature of this transition has been a matter of controversy for a long time. Recently, physicists from Neuchâtel rejuvenated an old theory to explain their photoemission data taken at the SLS on TiSe2 and to provide a promising solution to this problem.

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