4 papers
Anomalous temperature dependence of polaron mobility in a nonlinear double-well potential: unbiased X-propagator approach
Stefano Ragni, Osor S. Barišić, Naoto Nagaosa +1
We develop an unbiased X-propagator method for calculating finite-temperature optical conductivity and dc mobility for arbitrary nonlinear electron-phonon interaction. W…
Polaron formation as the vertex function problem: From Dyck's paths to self-energy Feynman diagrams
Tomislav MiÅ¡kiÄ, Juraj Krsnik, Stefano Ragni +2
We present an iterative method for generating the complete set of self-energy Feynman diagrams at arbitrary order for the single-polaron problem with arbitrary linear coupling to t…
Excitations across the equilibrium and photoinduced `hidden' states of magnetoresistive manganites
Shiyu Fan, Feng Jin, Taehun Kim +16
"Hidden" phases, generated using ultrafast laser pulses (few hundred femtoseconds), with properties distinct from thermodynamic equilibrium, are appealing for technologies because…
Polarons with arbitrary nonlinear electron-phonon interaction
Stefano Ragni, Tomislav MiÅ¡kiÄ, Thomas Hahn +5
We develop an exact computational method based on numerical X-propagators for solving polaron models with arbitrary nonlinear couplings of local vibration modes to the electron den…