University of Groningen
Spin transport in graphene-based van der Waals heterostructures
Ingla Aynés, Josep
IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from
it. Please check the document version below.
Document Version
Publisher's PDF, also known as Version of record
Publication date:
2018
Link to publication in University of Groningen/UMCG research database
Citation for published version (APA):
Ingla Aynés, J. (2018). Spin transport in graphene-based van der Waals heterostructures. Rijksuniversiteit
Groningen.
Copyright
Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).
Take-down policy
If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum.
Propositions
accompanying the dissertation
Spin transport in graphene-based van der Waals
heterostructures
1. Bilayer graphene is an appealing material for diffusive spin transport. It’s large mobilities lead to high diffusion coefficients and allow for very long spin diffusion lengths. (Chapter 5)
2. Spin drift can be used in bilayer graphene to achieve spin relaxation lengths up to 90 µm. Moreover, since the transport time depends inversely on the applied drift current, spin relaxation lengths in the millimeter range can be achieved if current densities in the range of mA/µm can be applied. (Chap-ter 6)
3. The ability to guide spin currents using drift enables new functionalities such as spin current demultiplexers. However, the efficiency of such operations in graphene is limited by the absence of a bandgap. (Chapters 6 and 7) 4. Graphene’s 2D nature makes it an optimal material to study proximity effects
by placing it in close contact with other materials with different properties, such as high spin-orbit coupling. (Chapter 8)
5. The combination of out-of-plane spin-orbit fields and time reversal symmetry leads to high spin lifetime anisotropies in multi-valley electronic systems. (Chapters 8 and 9)
6. The ability to break the inversion symmetry with a perpendicular electric field in bilayer graphene provides a unique knob to control the spin lifetime anisotropy. (Chapter 9)
7. The ability to perform phenomenological models to estimate the influence of a physical process in a specific measurement and draw quantitative conclu-sions from complex experiments is useful in experimental physics.
8. "God made the bulk; surfaces were invented by the devil." W. Pauli 9. To obtain a PhD degree requires a combination of perseverance to overcome
complex challenges with flexibility to change focus if required.
10. In research, the best projects are the ones which have the lowest risk and highest outcome impact. The pursue of these projects by different groups working in the same field often leads to direct competition between them . This is beneficial for research since the best confirmation for a scientific result is a report by a different group showing consistent results.
