Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 45: Transport: Spintronics, Spincalorics and Magnetotransport (jointly with HL, MA)

DS 45.8: Vortrag

Freitag, 24. März 2017, 11:15–11:30, HSZ 03

A Landauer-Büttiker approach for hyperfine mediated electronic transport in the integer quantum Hall regime — •Aniket Singha1, M. Hamzah Fauzi2, Yoshiro Hirayama2, and Bhaskaran Muralidharan11Department of Electrical Engineering, IIT Bombay, Powai, Mumbai-400076, India — 2Graduate School of Science, Tohoku University, Aoba-ku, Sendai-980-8578, Japan

The interplay of spin-polarized electronic edge states with the dynamics of host nuclei in quantum Hall systems presents rich and non-trivial transport physics. Here, we develop a Landauer-Büttiker approach to understand various experimental features observed in integer quantum Hall set ups featuring quantum point contacts. Such approach entails a phenomenological description of spin resolved inter-edge scattering induced via hyperfine assisted electron-nuclear spin flip-flop processes along with a self consistent simulation framework between the nuclear spin dynamics and edge state electronic transport in order to gain insights into the nuclear polarization effects on electronic transport vice-versa. In particular, we show that the hysteresis noted experimentally in the conductance-voltage trace as well as in the resistively detected NMR lineshape results from a lack of quasi-equilibrium between electronic transport and nuclear polarization evolution. In addition, we present circuit models to further facilitate a clear understanding of the electronic transport processes occurring near the quantum point contact.

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