TY - JOUR
T1 - THz-frequency modulation of the Hubbard U in an organic Mott insulator
AU - Singla, R.
AU - Cotugno, G.
AU - Kaiser, S.
AU - Först, M.
AU - Mitrano, M.
AU - Liu, H. Y.
AU - Cartella, A.
AU - Manzoni, C.
AU - Okamoto, H.
AU - Hasegawa, T.
AU - Clark, S. R.
AU - Jaksch, D.
AU - Cavalleri, A.
PY - 2015/10/30
Y1 - 2015/10/30
N2 - We use midinfrared pulses with stable carrier-envelope phase offset to drive molecular vibrations in the charge transfer salt ET-F2TCNQ, a prototypical one-dimensional Mott insulator. We find that the Mott gap, which is probed resonantly with 10 fs laser pulses, oscillates with the pump field. This observation reveals that molecular excitations can coherently perturb the electronic on-site interactions (Hubbard U) by changing the local orbital wave function. The gap oscillates at twice the frequency of the vibrational mode, indicating that the molecular distortions couple quadratically to the local charge density.
AB - We use midinfrared pulses with stable carrier-envelope phase offset to drive molecular vibrations in the charge transfer salt ET-F2TCNQ, a prototypical one-dimensional Mott insulator. We find that the Mott gap, which is probed resonantly with 10 fs laser pulses, oscillates with the pump field. This observation reveals that molecular excitations can coherently perturb the electronic on-site interactions (Hubbard U) by changing the local orbital wave function. The gap oscillates at twice the frequency of the vibrational mode, indicating that the molecular distortions couple quadratically to the local charge density.
UR - http://www.scopus.com/inward/record.url?scp=84946200316&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1103/PhysRevLett.115.187401
U2 - 10.1103/PhysRevLett.115.187401
DO - 10.1103/PhysRevLett.115.187401
M3 - Article
AN - SCOPUS:84946200316
SN - 0031-9007
VL - 115
SP - 1
EP - 6
JO - Physical Review Letters
JF - Physical Review Letters
IS - 18
M1 - 187401
ER -