Dirac imprints on the 
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-factor anisotropy in graphene

Prada, Marta; Tiemann, L.; Sichau, Jonas; Blick, Robert H.

doi:10.1103/physrevb.104.075401

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…Whereas the intrinsic correction is associated with the pseudoscalar τ σ z , the extrinsic correction is related to an in-plane pseudovector perpendicular to in-plane SL spin, σ τ . The angular momentum correction anisotropy presented here has been confirmed in recent angle-resolved electron-spin resonance experiments [17].…”

Section: Discussionsupporting

confidence: 81%

“…We consider band hybridization, spin-orbit coupling (SOC) and Bychkov-Rashba effect, and obtain a peculiar anisotropy in the corrections, owing to the relation of L and SL spin. These corrections have been verified in large graphene samples, by measuring the g-factor corrections [17].…”

Section: Introductionmentioning

confidence: 79%

“…For instance, electron-spin resonance on a graphene doped sample would allow to address directly the angular momentum correction. Since the value of the gap is known, 2λ I 42µeV [11,36], resolving g-tensor along the main crystallographic directions could be employed to find the value of atomic SOC, λ p,d soc [17] or the magnitude of the Stark parameter, λ z .…”

Section: Angular Momentum Contribution Of the σ Bandmentioning

confidence: 99%

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

Prada

2021

Phys. Rev. B

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 79%

Section: Angular Momentum Contribution Of the σ Bandmentioning

confidence: 99%

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

Prada

2021

Phys. Rev. B

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“…From a linear regression of the data points of the α resonances that directly follow hν = g • µ B • B, we deduced the effective electron g-factor of g = 1.896 ± 0.021, which is about (2.95±1.16)% smaller than determined from ESR measurements on 12 C graphene on a SiO 2 or SiC substrate. 39,40,[43][44][45] b. We observe an asymmetry that represents the energy splitting of sublattice and spin degrees of freedom.…”

Section: Electron Spin Activation and Hyperfine Interactionmentioning

confidence: 83%

Nuclear-induced dephasing and signatures of hyperfine effects in isotopically purified $^{13}$C graphene

Strenzke,

Meyer,

Grandt-Ionita

et al. 2022

Preprint

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The hyperfine interaction between the spins of electrons and nuclei is both a blessing and a curse. It can provide a wealth of information when used as an experimental probing technique but it can also be destructive when it acts as a dephasive perturbation on the electronic system. In this work, we fabricated large scale single and multilayer isotopically-purified 13 C graphene Hall bars to search for interaction effects between the nuclear magnetic moments and the electronic system. We find signatures of nuclei with a spin in the analysis of the weak localization phenomenon that shows a significant dichotomy in the scattering times of monolayer 12 C and 13 C graphene close the Dirac point. Microwave-induced electron spin flips were exploited to transfer momentum to the nuclei and build-up a nuclear field. The presence of a very weak nuclear field is encoded in a modulation of the electron Zeeman energy which shifts the energy for resonant absorption and reduces the g-factor.

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The quest for harnessing nuclear effects in graphene-based devices

Strenzke,

Prada,

Lopes

et al. 2024

Applied Physics Reviews

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The recent successes of superconducting qubits and the demonstration of quantum supremacy over classical bits herald a new era for information processing. Yet, the field is still in its infancy and there exist viable alternative candidates that can also store quantum information. In this review, we will highlight ideas, attempts, and the experimental progress to address nuclear spins in graphene, a readily available Dirac semimetal that consists of a single layer of carbon atoms. Carbon isotopes with a nuclear spin are rare in natural graphene. However, it is possible to enrich the spin-bearing 13C isotopes to produce large-scale graphene sheets, which constitute the testbed to store, transport, and retrieve spin information, or to engineer nanostructures. Here, the hyperfine interaction between the electron spins and the nuclear spins serves as an experimental control knob and mediator to address nuclear polarization and nuclear spin coherence times through electrical measurements. The exploitation of nuclear spins in graphene is thus an alluring perspective. We will discuss methods to synthesize 13C graphene and show experimental approaches and challenges to exploit the relatively weak hyperfine interaction in two-dimensional 13C graphene devices. The ultimate purpose, i.e., the exploitation of nuclear spins in graphene for information processing, is not within reach, but its potential for future applications merits a revisit of the current state-of-the-art.

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Dirac imprints on the g -factor anisotropy in graphene

Cited by 7 publications

References 38 publications

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

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

Nuclear-induced dephasing and signatures of hyperfine effects in isotopically purified $^{13}$C graphene

The quest for harnessing nuclear effects in graphene-based devices

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