SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Nonequilibrium Quantum Many-Body Systems I (joint session TT/DY)

DY 12.1: Vortrag

Dienstag, 28. März 2023, 09:30–09:45, HSZ 204

Ultrafast dynamics of quantum many-body systems including dynamical screening and strong coupling — •Michael Bonitz1, Jan-Philip Joost1, Hannes Ohldag1, Erik Schroedter1, and Iva Brezinova21CAU Kiel, Institute for Theoretical Physics and Astrophysics — 2TU Wien, Institute of Applied Physics, Vienna, Austria

Dynamical screening is a key property of charged many-particle systems. Its theoretical description is based on the GW approximation that is extensively applied for ground-state and equilibrium situations. The main limitation of the GW approximation is the neglect of strong electronic correlation effects. Here we derive the nonequilibrium dynamically screened ladder (DSL) approximation that self-consistently includes, in addition to the GW diagrams, also particle-particle and particle-hole T-matrix diagrams. Our DSL approach is formulated within the G1-G2 scheme [1,2] that is linear in time, in contrast to the cubic scaling of standard Nonequilibrium Green functions simulations. The price to pay for this speedup is the need to store the two-particle Green function. This can be avoided with a recently developed quantum fluctuations approach [3].
[1] N. Schluenzen et al., Phys. Rev. Lett. 124, 076601 (2020)
[2] J.-P. Joost al., Phys. Rev. B 105, 165155 (2022)
[3] E. Schroedter et al., Cond. Mat. Phys. 25 , 23401 (2022)

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