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Valleytronics based on 2D materials is a brand-new field which is considered as the heart of next-generation semiconductor technology. It proposes to use the valley degree of freedom as an information carrier. Compared with traditional electronics, valleytronics has the advantages of low power consumption, lossless information and faster processing speed. The top priorities of valleytronics are the generation and detection of valley-polarized currents, as well as the design and fabrication of optical devices, which achieve circularly polarized light absorption and electroluminescence.
This book aims to give an overview of the recent theoretical and experimental developments achieved in valleytronics based on various 2D materials. After some experimental progress at room temperature in manipulating the valley degree of freedom, valleytronics is considered superior to spintronics in the semiconductor industry. The book provides a useful reference for the growing community of researchers in the field of valleytronics, 2D materials and semiconductors. It will ignite the readers' interest in valleytronics and push the field forward.
Dr Sake Wang earned his PhD in physics at Southeast University, China, in 2016. Since 2021, he has been an Associate Professor at the Jinling Institute of Technology, China. He was a Visiting Scientist at Tohoku University, Japan, from 2019 to 2021. His current interests focus on theoretical studies of spin and valley transport, as well as valley-optoelectronic devices in two-dimensional materials. He has published 73 papers with more than 4,000 citations. Four of his first-authored and corresponding-authored papers are in the top 1% of ESI highly cited papers. In addition, he has served as an Associate Editor of the Journal of Superconductivity and Novel Magnetism (Springer Publishing) since 2020.
Dr Hongyu Tian has been an associate professor at Linyi University, China, since 2023. He completed his PhD in physics at Southeast University, China, in 2013. His research interests mainly focus on the electronic transport properties of two-dimensional systems, including spin and valley-related transport properties, as well as the transport properties of polycrystalline systems. He has published over 50 papers and is PI of the National Natural Science Foundation of China and the Natural Science Foundation of Shandong Province (China).
Preface
Acknowledgments
Author biographies
List of symbols
List of abbreviations
1 Introduction to two-dimensional (2D) materials and valleytronics
2 Berry phase and valley Hall effect (VHE)
3 Strain effect on valley polarisation (VP)
4 Other valley filter and valve effects
5 Valley-polarized current in polycrystalline systems
6 Valley current in multilayer and twisted systems
7 Valley optoelectronics based on monolayer 2D materials
8 Valley optoelectronics based on vdW materials
Appendix A: The matrix elements of the graphene TB Hamiltonian
Appendix B: Hermite polynomials
Appendix C: The dipole vector of hexagonal systems
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