Regensburg 2013 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 1: Quantum Dynamics, Decoherence and Quantum Information I
DY 1.5: Talk
Monday, March 11, 2013, 10:30–10:45, H39
The role of non-linear second-order coupling Hamiltonians in photoemission and Raman spectroscopy — Johannes Flick1, Heiko Appel1, and •Angel Rubio1,2 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2NanoBio Spectroscopy group and ETSF, Universidad del País Vasco, San Sebastián, Spain
In this talk we employ an exact Fock space representation to
study Holstein-Su-Schrieffer-Hamiltonian systems[1,2] coupled to
quantized photon modes. In particular, we include non-linear
electron-phonon couplings, which originate from an expansion
to second order in the nuclear displacement[3]. We perform exact
diagonalizations and real-time propagations for the model in Fock
space and investigate the effect of the nonlinear couplings on
photoemission (PE), inverse photoemission (IPE) and Raman
spectra.
[1] W.P. Su, J.R. Schrieffer, A.J. Heeger Phys. Rev. Lett., 42 (1979), pp. 1698−1701
[2] T. Holstein, Ann. Phys. (N.Y.) 8, 325 (1959)
[3] L. Cederbaum and W. Domcke, J. Chem. Phys. 60, 7 (1974).
80, 212303 (2009).