Charge-to-spin conversion in twisted 
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 heterostructures

Lee, Seungjun; Sousa, D. J. P. de; Kwon, Young–Kyun; Juan, Fernando de; Chi, Zhendong; Casanova, Fèlix; Low, Tony

doi:10.1103/physrevb.106.165420

Cited by 30 publications

(15 citation statements)

References 46 publications

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“…Explicitly, the setup (ii) is obtained from (i) by rotating the upper TMD layer by C 2z . We consider only 'Rashba' and 'Ising'-type SOC, with couplings λ R and λ I , since these are known to be more dominant than any other type [50][51][52][53][54]. It is noteworthy that the relative strength of λ R and λ I can be tuned with the twist angle θ TMD between the graphene and the TMD layers [50-54, 57, 58].…”

Section: A Continuum Modelmentioning

confidence: 99%

“…Transition metal dichalcogenide (TMD) layers, e.g. WSe 2 or MoSe 2 , can be used to induce SOC in graphene [46][47][48]; the form of the proximitized SOC terms is well established for both single-layer [49][50][51][52][53][54], and non-twisted multi-layer [55][56][57][58], graphene. Notably, the resulting SOC terms induced by the TMD layer can be tuned based on the choice of TMD and the twist angle relative to graphene [50-54, 57, 58].…”

Section: Introductionmentioning

confidence: 99%

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Tunable Superconductivity and Möbius Fermi Surfaces in an Inversion-Symmetric Twisted van der Waals Heterostructure

Scammell

Scheurer²

2023

Phys. Rev. Lett.

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We investigate the superconducting properties of inversion-symmetric twisted trilayer graphene by considering different parent states, including spin-singlet, triplet, and SO(4) degenerate states, with or without nodal points. By placing transition metal dichalcogenide layers above and below twisted trilayer graphene, spin-orbit coupling is induced in TTLG and, due to inversion symmetry, the spinorbit coupling does not spin-split the bands. The application of a displacement field (D0) breaks the inversion symmetry and creates spin-splitting. We analyze the evolution of the superconducting order parameters in response to the combined spin-orbit coupling and D0-induced spin-splitting. Utilizing symmetry analysis combined with both a direct numerical evaluation and a complementary analytical study of the gap equation, we provide a comprehensive understanding of the influence of spin-orbit coupling and D0 on superconductivity. These results contribute to a better understanding of the superconducting order in twisted trilayer graphene.

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Section: A Continuum Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable Superconductivity and Möbius Fermi Surfaces in an Inversion-Symmetric Twisted van der Waals Heterostructure

Scammell

Scheurer²

2023

Phys. Rev. Lett.

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“…Such a feature has been only achieved in optical lattice analog to bilayer graphene [91]. Twisted graphene/TMDC heterostructures have been recently intensively studied [92][93][94][95][96] and control of the twist angle is of paramount importance for possible applications based on the design of spin-charge conversion utilizing the Rashba-Edelstein effect [8,90,[97][98][99]. Here we show that the same level of functionality can be expected also for graphene/CDW states where the 'role of the twist' is played by the spatial topology of CDW.…”

Section: Introductionmentioning

confidence: 99%

Spin–orbit and exchange proximity couplings in graphene/1T-TaS₂ heterostructure triggered by a charge density wave

et al. 2023

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Proximity-induced ﬁne features and spin-textures of the electronic bands in graphene-based van der Waals heterostructures can be explored from the point of tailoring a twist angle. Here we study spin-orbit coupling and exchange coupling engineering of graphene states in the proximity of 1T-TaS2 not triggering the twist, but a charge density wave in 1T-TaS2—a realistic low-temperature phase. Using density functional theory and eﬀective model we found that the emergence of the charge density wave in 1T-TaS2 signiﬁcantly enhances Rashba spin-orbit splitting in graphene and tilts the spin texture by a signiﬁcant Rashba angle—in a very similar way as in the conventional twist-angle scenarios. Moreover, the partially ﬁlled Ta d-band in the charge density wave phase leads to the spontaneous emergence of the in-plane magnetic order that transgresses via proximity from 1T-TaS2 to graphene, hence, simultaneously superimposing along the spin-orbit also the exchange coupling proximity eﬀect. To describe this intricate proximity landscape we have developed an eﬀective model Hamiltonian and provided a minimal set of parameters that excellently reproduces all the spectral features predicted by the ﬁrst-principles calculations. Conceptually, the charge density wave provides a highly interesting knob to control the ﬁne features of electronic states and to tailor the superimposed proximity eﬀects—a sort of twistronics without twist.

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“…We verify that the symmetric, charge-carrier sign-dependent Hall response is absent in graphene devices without the WSe 2 layer. Note that previous studies of the SLG–WSe 2 heterostructure (or graphene on transition metal dichalcogenides in general) focused primarily on the spin aspects of the transport, ,,− where a nonlocal signal is measured as a signature of the spin Hall effect and weak (anti) localization measurements were used to quantify the spin–orbit coupling strength. ,− Interestingly, these studies did not probe the finite Hall effect without a magnetic field. This makes our observation of the time-reversal symmetric nontrivial Hall effect in this system unique.…”

mentioning

confidence: 99%

Observation of the Time-Reversal Symmetric Hall Effect in Graphene–WSe₂ Heterostructures at Room Temperature

et al. 2023

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In this Letter, we provide experimental evidence of the time-reversal symmetric Hall effect in a mesoscopic system, namely, high-mobility graphene–WSe2 heterostructures. This linear, dissipative Hall effect, whose sign depends on the sign of the charge carriers, persists up to room temperature. The magnitude and the sign of the Hall signal can be tuned using an external perpendicular electric field. Our joint experimental and theoretical study establishes that the strain induced by lattice mismatch, or alignment angle inhomogeneity, produces anisotropic bands in graphene while simultaneously breaking the inversion symmetry. The band anisotropy and reduced spatial symmetry lead to the appearance of a time-reversal symmetric Hall effect. Our study establishes graphene–transition metal dichalcogenide-based heterostructures as an excellent platform for studying the effects of broken symmetry on the physical properties of band-engineered two-dimensional systems.

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Charge-to-spin conversion in twisted graphene/WSe2 heterostructures

Cited by 30 publications

References 46 publications

Tunable Superconductivity and Möbius Fermi Surfaces in an Inversion-Symmetric Twisted van der Waals Heterostructure

Tunable Superconductivity and Möbius Fermi Surfaces in an Inversion-Symmetric Twisted van der Waals Heterostructure

Spin–orbit and exchange proximity couplings in graphene/1T-TaS₂ heterostructure triggered by a charge density wave

Observation of the Time-Reversal Symmetric Hall Effect in Graphene–WSe₂ Heterostructures at Room Temperature

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Charge-to-spin conversion in twisted graphene/WSe2 heterostructures

Cited by 30 publications

References 46 publications

Tunable Superconductivity and Möbius Fermi Surfaces in an Inversion-Symmetric Twisted van der Waals Heterostructure

Tunable Superconductivity and Möbius Fermi Surfaces in an Inversion-Symmetric Twisted van der Waals Heterostructure

Spin–orbit and exchange proximity couplings in graphene/1T-TaS2 heterostructure triggered by a charge density wave

Observation of the Time-Reversal Symmetric Hall Effect in Graphene–WSe2 Heterostructures at Room Temperature

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Product

Resources

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Spin–orbit and exchange proximity couplings in graphene/1T-TaS₂ heterostructure triggered by a charge density wave

Observation of the Time-Reversal Symmetric Hall Effect in Graphene–WSe₂ Heterostructures at Room Temperature