Journal
PHYSICAL REVIEW LETTERS
Volume 130, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.130.226501
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The ultrafast electronic structures of 1T-TiSe2, a charge density wave material, were studied using high-resolution time- and angle-resolved photoemission spectroscopy. The study found that the populations of quasiparticles drove ultrafast electronic phase transitions in 1T-TiSe2 within 100 fs after photoexcitation. A metastable metallic state, different from the equilibrium normal phase, was observed below the charge density wave transition temperature. The photoinduced metastable metallic state resulted from the coherent electron-phonon coupling process, where the motion of atoms was halted, and its lifetime was prolonged with increasing pump fluence.
The ultrafast electronic structures of the charge density wave material 1T-TiSe2 were investigated by high-resolution time-and angle-resolved photoemission spectroscopy. We found that the quasiparticle populations drove ultrafast electronic phase transitions in 1T-TiSe2 within 100 fs after photoexcitation, and a metastable metallic state, which was significantly different from the equilibrium normal phase, was evidenced far below the charge density wave transition temperature. Detailed time-and pump-fluence-dependent experiments revealed that the photoinduced metastable metallic state was a result of the halted motion of the atoms through the coherent electron-phonon coupling process, and the lifetime of this state was prolonged to picoseconds with the highest pump fluence used in this study. Ultrafast electronic dynamics were well captured by the time-dependent Ginzburg-Landau model. Our work demonstrates a mechanism for realizing novel electronic states by photoinducing coherent motion of atoms in the lattice.
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