Dirac imprints on the $g$-factor anisotropy in graphene
| Autor: | Robert H. Blick, Jonas Sichau, L. Tiemann, Marta Prada |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Graphene Fermi level Dirac (software) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Electron Spin–orbit interaction Coupling (probability) law.invention symbols.namesake law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) symbols Anisotropy Spin (physics) |
| DOI: | 10.48550/arxiv.2012.06324 |
| Popis: | Dirac electrons in graphene are to lowest order spin 1/2 particles, owing to the orbital symmetries at the Fermi level. However, anisotropic corrections in the $g$-factor appear due to the intricate spin-valley-orbit coupling of chiral electrons. We resolve experimentally the $g$-factor along the three orthogonal directions in a large-scale graphene sample. We employ a Hall bar structure with an external magnetic field of arbitrary direction, and extract the effective $g$-tensor via resistively-detected electron spin resonance. We employ a theoretical perturbative approach to identify the intrinsic and extrinsic spin orbit coupling and obtain a fundamental parameter inherent to the atomic structure of $^{12}$C, commonly used in ab-initio models. Comment: 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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