SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Spintronics, Spincalorics and Magnetotransport
TT 11.5: Vortrag
Montag, 27. März 2023, 16:00–16:15, HSZ 304
Electron and spin-phonon interaction in DNA: A minimum analytical model — •Mayra Peralta1, Solmar Varela1, Vladimiro Mujica2, Rafael Gutiérrez1, Ernesto Medina3, and Gianaurelio Cuniberti1 — 1Institute of Materials Science and Nanotechnology, Technische Universität Dresden, Dresden 01062, Germany — 2School of Molecular Sciences, Arizona State University, TEMPE, AZ 85287 — 3Departamento de Física, Colegio de Ciencias e Ingeniería, Universidad San Francisco de Quito, Diego de Robles y Vía Interoceánica, Quito, 170901, Ecuador
We analyze the influence of electron-phonon and spin-phonon interaction in a model for electron transfer(ET) in DNA in terms of the envelope function approach. We are specifically concerned with the effect of these interactions on the coherence of the ET process and how to model the interaction of DNA with phonon reservoirs of biological relevance. We assume that the electron bearing orbitals are half filled and derive the physics of the electron- and spin-phonon coupling in the vicinity in reciprocal space. In a first model for spinless electrons we find that at half filling, the acoustical modes are decoupled to ET at first order, while optical modes are predominant. The latter are associated with inter-strand vibrational modes in consistency with previous studies involving polaron models of ET. Coupling to acoustic modes depends on electron doping of DNA, while optical modes are always coupled within our model. When the spin is included, through the Spin-orbit coupling whose intensity is geometry dependent, we find that acoustical phonons become coupled independently of the doping.