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Spin phenomena in two dimensional materials

Speaker: 
Jaroslav Fabian (University of Regensburg, Germany)
Date: 
Wed, 13/05/2015 - 11:30am to 12:30pm
Location: 
Physics Conference Room (S13-M01-11)
Host: 
Barbaros Oezyilmaz, Shaffique Adam
Event Type: 
Seminars

Abstract

Two dimensional materials, such as graphene, transition metal dichalcogenides, or black phosphorous, offer immense opportunities for electronics and spintronics [1]. Being ultimately thin these materials could make the thinnest diodes and transistors, or the thinnest magnetic sensors and read heads. Being essentially a surface, they are also susceptible to adatoms and admolecules which can induce local magnetic moments and giant spin-orbit coupling [2]. This is in fact a great opportunity, allowing us to decorate (functionalize) graphene and like materials with specific defects to make desired properties. I will review the essential spin physics of novel two dimensional materials, including spin-orbit coupling and magnetic moments, and discuss the ramifications of the (intended and non-intended) functionalization for spin transport experiments. Most of the results are obtained by performing first principles calculations on large atomic supercells, necessary to study the physics in the dilute defect limit. These calculations show a nice agreement with experiments regarding spin relaxation in single [3] and bilayer [4] graphene, but also make authoritative predictions for future realistic charge and spin based device---an example is given by optospintronics in graphene/TMC structures.

[1] W. Han, R. Kawakami, M. Gmitra, and J. Fabian, Nature Nanotechnology 9, 794 (2014).
[2] M. Gmitra, D. Kochan, and J. Fabian, Phys. Rev. Lett. 110, 246602 (2013).
[3] D. Kochan, M. Gmitra, and J. Fabian, Phys. Rev. Lett. 112, 116602 (2014).
[4] D. Kochan, S. Irmer, M. Gmitra, and J. Fabian, arXiv:1504.03898

 

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