Angular momentum anisotropy of Dirac carriers: A new twist in graphene

Prada, Marta

doi:10.1103/physrevb.103.115425

Cited by 5 publications

(1 citation statement)

References 38 publications

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“…Apart from the Kane–Mele SO coupling, which is intrinsically present in graphene and BLG, extrinsic Bychkov–Rashba SO coupling and pseudospin inversion asymmetry (or principal plane asymmetry) SO coupling can in principle also play a role 12 – 16 , 28 , 29 . The latter, which arises for example when placing graphene or BLG on substrates, such as e.g., hBN, depends on the magnitude of k (measured from the corners of the Brillouin zone) and is thus suppressed at the and -points 16 , where our devices are operated.…”

Section: Discussionmentioning

confidence: 99%

Spin-valley coupling in single-electron bilayer graphene quantum dots

et al. 2021

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Understanding how the electron spin is coupled to orbital degrees of freedom, such as a valley degree of freedom in solid-state systems, is central to applications in spin-based electronics and quantum computation. Recent developments in the preparation of electrostatically-confined quantum dots in gapped bilayer graphene (BLG) enable to study the low-energy single-electron spectra in BLG quantum dots, which is crucial for potential spin and spin-valley qubit operations. Here, we present the observation of the spin-valley coupling in bilayer graphene quantum dots in the single-electron regime. By making use of highly-tunable double quantum dot devices we achieve an energy resolution allowing us to resolve the lifting of the fourfold spin and valley degeneracy by a Kane-Mele type spin-orbit coupling of ≈ 60 μeV. Furthermore, we find an upper limit of a potentially disorder-induced mixing of the $$K$$ K and $$K^{\prime}$$ K ′ states below 20 μeV.

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Section: Discussionmentioning

confidence: 99%

Spin-valley coupling in single-electron bilayer graphene quantum dots

et al. 2021

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Topological phase transition in chiral graphene nanoribbons: from edge bands to end states

Sanz

Merino-Díez

et al. 2021

Nat Commun

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Precise control over the size and shape of graphene nanostructures allows engineering spin-polarized edge and topological states, representing a novel source of non-conventional π-magnetism with promising applications in quantum spintronics. A prerequisite for their emergence is the existence of robust gapped phases, which are difficult to find in extended graphene systems. Here we show that semi-metallic chiral GNRs (chGNRs) narrowed down to nanometer widths undergo a topological phase transition. We fabricated atomically precise chGNRs of different chirality and size by on surface synthesis using predesigned molecular precursors. Combining scanning tunneling microscopy (STM) measurements and theory simulations, we follow the evolution of topological properties and bulk band gap depending on the width, length, and chirality of chGNRs. Our findings represent a new platform for producing topologically protected spin states and demonstrate the potential of connecting chiral edge and defect structure with band engineering.

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