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2022 | Book

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Spin Dynamics in Two-Dimensional Quantum Materials

A Theoretical Study

Author: Dr. Marc Vila Tusell

Publisher: Springer International Publishing

Book Series : Springer Theses

Part of: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

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About this book

This thesis focuses on the exploration of nontrivial spin dynamics in graphene-based devices and topological materials, using realistic theoretical models and state-of-the-art quantum transport methodologies. The main outcomes of this work are: (i) the analysis of the crossover from diffusive to ballistic spin transport regimes in ultraclean graphene nonlocal devices, and (ii) investigation of spin transport and spin dynamics phenomena (such as the (quantum) spin Hall effect) in novel topological materials, such as monolayer Weyl semimetals WeTe2 and MoTe2. Indeed, the ballistic spin transport results are key for further interpretation of ultraclean spintronic devices, and will enable extracting precise values of spin diffusion lengths in diffusive transport and guide experiments in the (quasi)ballistic regime. Furthermore, the thesis provides an in-depth theoretical interpretation of puzzling huge measured efficiencies of the spin Hall effect in MoTe2, as well as a prediction of a novel canted quantum spin Hall effect in WTe2 with spins pointing in the yz plane.

Table of Contents

Frontmatter
Chapter 1. Introduction
Abstract
The continuous miniaturization of silicon-based complementary metal-oxide-semiconductor (CMOS) devices faces fundamental physical limits and engineeering problems as their components reach the size of a few nanometers.
Marc Vila Tusell
Chapter 2. Fundamentals of Spin Dynamics in Two-Dimensional Materials
Abstract
In this section, I review some of the principal physical phenomena involved in spin dynamics.
Marc Vila Tusell
Chapter 3. Quantum Transport Methodologies for Spin Transport
Abstract
Numerical simulations are an important tool to study physical and chemical properties of materials and, with the continuous improvement of modern computers, realistic calculations can be carried out even on a laptop. Although computer simulations imply approximating a real material to a set of physical equations, they offer unique advantages. One can calculate properties without performing an experiment and thus it is possible to make predictions about uncharacterized materials, undiscovered physical effects or obtain microscopic insights into physical phenomena that experiments cannot unveil.
Marc Vila Tusell
Chapter 4. Nonlocal Spin Dynamics in the Crossover from Diffusive to Ballistic Transport in Graphene
Abstract
This chapter focuses on the simulation of nonlocal spin transport in graphene NSVs using the Landauer-Büttiker formalism.
Marc Vila Tusell
Chapter 5. Spin Dynamics in Low-Symmetry Transition Metal Dichalcogenides
Abstract
This chapter devotes to the spin dynamics of MoTe\(_2\) and WTe\(_2\), namely, spin relaxation, spin Hall effect (SHE) and quantum spin Hall effect (QSHE). The first two phenomena will be studied for MoTe\(_2\) given the recent experimental findings concerning unconventional SHE and large spin diffusion lengths [3, 4]. On the other hand, since WTe\(_2\) has received more attention in the topic of QSHE [5‐11], our simulations of this effect will focus on WTe\(_2\).
Marc Vila Tusell
Chapter 6. Conclusions and Outlook
Abstract
In this thesis I explored the spin dynamics in two-dimensional quantum materials such as graphene and transition metal dichalcogenides (TMDs). To that end, I have adapted an existing quantum transport computational platform.
Marc Vila Tusell
Backmatter
Metadata
Title
Spin Dynamics in Two-Dimensional Quantum Materials
Author
Dr. Marc Vila Tusell
Copyright Year
2022
Electronic ISBN
978-3-030-86114-8
Print ISBN
978-3-030-86113-1
DOI
https://doi.org/10.1007/978-3-030-86114-8

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