Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 8: Transport and theory of electronic structure

HL 8.8: Vortrag

Montag, 1. April 2019, 16:45–17:00, H33

Analytically tractable model for chirality-induced spin selectivity — •Areg Ghazaryan¹, Yossi Paltiel², and Mikhail Lemeshko¹ — ¹IST Austria (Institute of Science and Technology Austria), Am Campus 1, 3400 Klosterneuburg, Austria — ²Department of Applied Physics, Hebrew University, Jerusalem 91904, Israel

It is well established experimentally that electron transmission and tunneling through chiral molecules is spin selective. This phenomenon is termed as chirality-induced spin selectivity (CISS). Despite substantial advances on the experimental investigation of CISS, a theoretical understanding of the microscopic origin of the effect is still lacking. Previous theoretical efforts usually employed helical structure of the molecule for constructing the scattering or transport theories of CISS. The complicated geometry of the helix makes these theories intractable analytically. Here we develop a scattering theory for the CISS effect, by modelling the molecule as a combination of dipoles. These allows us to develop an analytically tractable model for analyzing the microscopic origin of the CISS effect. Different enantiomers are distinguished with different directions of the dipoles and the dipole moments can be directly measured using Stark effect measurements of the microwave spectrum of the molecules. Therefore, the parameters of our model can be directly obtained from the experimental results.