Gate voltage dependent Rashba spin splitting in hole transverse magnetic focusing

Rendell, M. J.; Liles, S. D.; Srinivasan, Ashwin; Klochan, O.; Farrer, I.; Ritchie, D. A.; Hamilton, A. R.

doi:10.1103/physrevb.105.245305

Cited by 6 publications

(8 citation statements)

References 29 publications

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“…Further, we show that Shubnikov-de Haas oscillations exhibit a weaker band splitting, suggesting that it probes different electron dynamics. Interestingly, a similar behavior was found in studies on 2DEG with SOC 19 , 21 , indicating that this is universal and a new theory is needed to explain the phenomenon. Our study, therefore, places graphene-TMDC heterostructures as an interesting new material platform to explore the effect of SOC on ballistic electron transport in low-dimensional systems.…”

Section: Introductionsupporting

confidence: 73%

“…3d , e. Therefore, we can estimate that in our system, the Rashba term dominates. Similarly, studies on 2DEG systems with Rashba SOC have indeed shown no splitting in the second focusing peak 19 , 21 , 55 .…”

Section: Resultsmentioning

confidence: 79%

“…Moreover, TMF can also be used to study or control electron dynamics as charge carriers follow skipping cyclotron orbits during the process. In 2D electron gas (2DEG) systems with SOC, the TMF was indeed used to probe spin-orbit split bands and extract SOC strength by studying the separation of the peaks 17 , 19 , 21 , deduce spin polarization by comparing their heights 17 , or focus spin-polarized current by controlling ballistic electron motion 17 , 19 , 20 .

Fig.…”

Section: Introductionmentioning

confidence: 99%

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Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2

Rao,

Kang,

Xue

et al. 2023

Nat Commun

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Van der Waals interactions with transition metal dichalcogenides were shown to induce strong spin-orbit coupling (SOC) in graphene, offering great promises to combine large experimental flexibility of graphene with unique tuning capabilities of the SOC. Here, we probe SOC-driven band splitting and electron dynamics in graphene on WSe2 by measuring ballistic transverse magnetic focusing. We found a clear splitting in the first focusing peak whose evolution in charge density and magnetic field is well reproduced by calculations using the SOC strength of ~ 13 meV, and no splitting in the second peak that indicates stronger Rashba SOC. Possible suppression of electron-electron scatterings was found in temperature dependence measurement. Further, we found that Shubnikov-de Haas oscillations exhibit a weaker band splitting, suggesting that it probes different electron dynamics, calling for a new theory. Our study demonstrates an interesting possibility to exploit ballistic electron motion pronounced in graphene for emerging spin-orbitronics.

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Section: Introductionsupporting

confidence: 73%

Section: Resultsmentioning

confidence: 79%

Fig.…”

Section: Introductionmentioning

confidence: 99%

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Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2

Rao,

Kang,

Xue

et al. 2023

Nat Commun

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“…In a magnetic focussing measurement, this results in separate cyclotron orbits for each spin and creates a spatial spin separation, splitting the first focussing peak. Previous work has demonstrated the ability to detect a change in peak splitting as the magnitude of the Rashba SOI is changed [19].…”

Section: Magnetic Focussing With a Cubic Rashba Spin-orbit Interactionmentioning

confidence: 99%

“…A recent study investigated magnetic focussing using a device where the Rashba SOI magnitude could be tuned in situ using a top gate voltage (V TG ) [19]. This technique revealed an increase in the spatial separation of the spin-split focussing trajectories as the Rashba SOI was increased.…”

Section: Introductionmentioning

confidence: 99%

Spin polarization and spin-dependent scattering of holes observed in transverse magnetic focusing

et al. 2023

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Landau‐Level Spectrum and the Effect of Spin–Orbit Coupling in Monolayer Graphene on Transition Metal Dichalcogenides

Rao,

Xue,

2024

Physica Status Solidi (b)

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In graphene on transition metal dichalcogenides, two types of spin–orbit coupling (SOC)—Rashba and spin–valley Zeeman SOCs—can coexist that modify graphene's electronic band differently. Herein, it is shown that the Landau levels (LLs) are also affected by these SOCs distinctively enough to estimate their relative strengths from the Landau fan diagram. A simple theoretical model is used to calculate the LL spectra of graphene for different SOC strengths, revealing that when the total SOC is strong enough (i.e., when it is comparable to the half of the energy gap between the LLs of an intrinsic graphene), the corresponding LLs will split and cross with others depending sensitively on the relative strengths of the SOC terms. To demonstrate how one can use it to estimate the relative SOC strengths, the four key features that are well separated from the complex background are first identified and compared with experiment to show that in the sample investigated, the Rashba SOC is stronger than the spin–valley Zeeman SOC consistent with other spectroscopic measurements. The study therefore provides a simple and practical strategy to analyze the LL spectrum in graphene with SOC before carrying out more in‐depth measurements.

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Gate voltage dependent Rashba spin splitting in hole transverse magnetic focusing

Abstract: This is a repository copy of Gate voltage dependent Rashba spin splitting in hole transverse magnetic focusing.

Cited by 6 publications

References 29 publications

Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2

Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2

Spin polarization and spin-dependent scattering of holes observed in transverse magnetic focusing

Landau‐Level Spectrum and the Effect of Spin–Orbit Coupling in Monolayer Graphene on Transition Metal Dichalcogenides

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