Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.036405
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Funding
- German Science Foundation through the Collaborative Research Center [CRC925]
- German Science Foundation through the Emmy Noether program [SE 2558/2-1]
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Charge density waves (CDWs) are symmetry-broken ground states that commonly occur in low-dimensional metals due to strong electron-electron and/or electron-phonon coupling. The nonequilibrium carrier distribution established via photodoping with femtosecond laser pulses readily quenches these ground states and induces an ultrafast insulator-to-metal phase transition. To date, CDW melting has been mainly investigated in the single-photon regime with pump photon energies bigger than the gap size. The recent development of strong-field midinfrared sources now enables the investigation of CDW dynamics following subgap excitation. Here we excite prototypical one-dimensional indium wires with a CDW gap of similar to 300 meV with midinfrared pulses at h omega = 190 meV with MV/cm field strength and probe the transient electronic structure with time- and angle-resolved photoemission spectroscopy. We find that the CDW gap is filled on a timescale short compared to our temporal resolution of 300 fs and that the band structure changes are completed within similar to 1 ps. Supported by a minimal theoretical model we attribute our findings to multiphoton absorption across the CDW gap.
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