Fast Green’s Function Method for Ultrafast Electron-Boson Dynamics
| Autor: | Yaroslav Pavlyukh, Enrico Perfetto, Daniel Karlsson, Robert van Leeuwen, Gianluca Stefanucci |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
bosonit
Propagation time Photon Phonon Degrees of freedom (physics and chemistry) FOS: Physical sciences General Physics and Astronomy Electron elektronit 01 natural sciences 7. Clean energy 010305 fluids & plasmas Condensed Matter - Strongly Correlated Electrons laskennallinen tiede 0103 physical sciences simulointi kvanttifysiikka 010306 general physics fononit Boson Physics Conservation law Settore FIS/03 Strongly Correlated Electrons (cond-mat.str-el) Computational physics Relaxation (physics) |
| Zdroj: | Physical Review Letters. 127 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | The interaction of electrons with quantized phonons and photons underlies the ultrafast dynamics of systems ranging from molecules to solids, and it gives rise to a plethora of physical phenomena experimentally accessible using time-resolved techniques. Green's function methods offer an invaluable interpretation tool since scattering mechanisms of growing complexity can be selectively incorporated in the theory. Currently, however, real-time Green's function simulations are either prohibitively expensive due to the cubic scaling with the propagation time or do neglect the feedback of electrons on the bosons, thus violating energy conservation. We put forward a computationally efficient Green's function scheme which overcomes both limitations. The numerical effort scales linearly with the propagation time while the simultaneous dressing of electrons and bosons guarantees the fulfillment of all fundamental conservation laws. We present a real-time study of the phonon-driven relaxation dynamics in an optically excited narrow band-gap insulator, highlighting the nonthermal behavior of the phononic degrees of freedom. Our formulation paves the way to first-principles simulations of electron-boson systems with unprecedented long propagation times. 7 pages, with additional supplementary materials |
| Databáze: | OpenAIRE |
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