Twist-angle-tunable spin texture in WSe2/graphene van der Waals heterostructures
Source abstract
Abstract
Twist engineering has emerged as a powerful approach for modulating electronic properties in van der Waals heterostructures. While theoretical works have predicted the modulation of spin texture in graphene-based heterostructures by twist angle, experimental studies are lacking. Here, by performing spin precession experiments, we demonstrate tunability of the spin texture and associated spin-charge interconversion with twist angle in WSe2/graphene heterostructures. For specific twist angles, we detect a spin component radial with the electron's momentum, in addition to the standard orthogonal component. Our results show that the helicity of the spin texture can be reversed by twist angle, highlighting the critical role of the twist angle in the spin-orbit properties of WSe2/graphene heterostructures and paving the way for the development of spin-twistronic devices.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Graphene research and applications · 2D Materials and Applications · Quantum and electron transport phenomena
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (50)
Show source-provided references
1. Ribeiro-Palau, R. et al. Twistable electronics with dynamically rotatable heterostructures. Science 361, 690–693 (2018).10.1126/science.aat6981 ↗
2. Andrei, E. Y. & MacDonald, A. H. Graphene bilayers with a twist. Nat. Mater. 19, 1265–1275 (2020).10.1038/s41563-020-00840-0 ↗
3. Kennes, D. M. et al. Moiré heterostructures as a condensed-matter quantum simulator. Nat. Phys. 17, 155–163 (2021).10.1038/s41567-020-01154-3 ↗
4. Serlin, M. et al. Intrinsic quantized anomalous Hall effect in a moiré heterostructure. Science 367, 900–903 (2020).10.1126/science.aay5533 ↗
5. Zheng, Z. et al. Unconventional ferroelectricity in moiré heterostructures. Nature 588, 71–76 (2020).10.1038/s41586-020-2970-9 ↗
6. Lin, J. X. et al. Spin–orbit-driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene. Science 375, 437–441 (2022).10.1126/science.abh2889 ↗
7. Tschirhart, C. L. et al. Intrinsic spin Hall torque in a moiré Chern magnet. Nat. Phys. 19, 807–813 (2023).10.1038/s41567-023-01979-8 ↗
8. Tao, Z. et al. Giant spin Hall effect in AB-stacked MoTe2/WSe2 bilayers. Nat. Nano. 19, 28–24 (2024).10.1038/s41565-023-01492-2 ↗
9. Cao, Y. et al. Unconventional superconductivity in magic-angle graphene superlattices. Nature 556, 43–50 (2018).10.1038/nature26160 ↗
10. Sun, L. et al. Determining spin–orbit coupling in graphene by quasiparticle interference imaging. Nat. Commun. 14, 3771 (2023).10.1038/s41467-023-39453-x ↗
11. Ingla-Aynés, J., Meijerink, R. J. & Wees, B. J. V. Eighty-eight percent directional guiding of spin currents with 90 μm relaxation length in bilayer graphene using carrier drift. Nano Lett. 16, 4825–4830 (2016).10.1021/acs.nanolett.6b01004 ↗
12. Drögeler, M. et al. Spin lifetimes exceeding 12 ns in graphene nonlocal spin valve devices. Nano Lett. 16, 3533–3539 (2016).10.1021/acs.nanolett.6b00497 ↗
13. Yang, H. et al. Gate-tunable spin Hall effect in an all-light-element heterostructure: graphene with copper oxide. Nano Lett. 23, 4406–4414 (2023).10.1021/acs.nanolett.3c00687 ↗
14. Ontoso, N. et al. Unconventional charge-to-spin conversion in graphene/MoTe2 van der Waals heterostructures. Phys. Rev. Appl. 19, 014053 (2023).10.1103/PhysRevApplied.19.014053 ↗
15. Ghiasi, T. S., Kaverzin, A. A., Blah, P. J. & Van Wees, B. J. Charge-to-spin conversion by the Rashba–Edelstein effect in two-dimensional van der Waals heterostructures up to room temperature. Nano Lett. 19, 5959–5966 (2019).10.1021/acs.nanolett.9b01611 ↗
16. Gmitra, M., Kochan, D. & Fabian, J. Spin–orbit coupling in hydrogenated graphene. Phys. Rev. Lett. 110, 246602 (2013).10.1103/PhysRevLett.110.246602 ↗
17. Weeks, C., Hu, J., Alicea, J., Franz, M. & Wu, R. Engineering a robust quantum spin Hall state in graphene via adatom deposition. Phys. Rev. X 1, 021001 (2011).
18. Gmitra, M., Kochan, D., Högl, P. & Fabian, J. Trivial and inverted Dirac bands and the emergence of quantum spin Hall states in graphene on transition-metal dichalcogenides. Phys. Rev. B 93, 155104 (2016).10.1103/PhysRevB.93.155104 ↗
19. Calleja, F. et al. Spatial variation of a giant spin–orbit effect induces electron confinement in graphene on Pb islands. Nat. Phys. 11, 43–47 (2015).10.1038/nphys3173 ↗
20. Safeer, C. K. et al. Reliability of spin-to-charge conversion measurements in graphene-based lateral spin valves. 2D Mater. 9, 015024 (2022).10.1088/2053-1583/ac3c9b ↗
21. Ingla-Aynés, J. et al. Omnidirectional spin-to-charge conversion in graphene/NbSe2 van der Waals heterostructures. 2D Mater. 9, 045001 (2022).10.1088/2053-1583/ac76d1 ↗
22. Ingla-Aynés, J., Herling, F., Fabian, J., Hueso, L. E. & Casanova, F. Electrical control of valley-Zeeman spin–orbit-coupling–induced spin precession at room temperature. Phys. Rev. Lett. 127, 047202 (2021).10.1103/PhysRevLett.127.047202 ↗
23. Herling, F. et al. Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe2. APL Mater. 8, 071103 (2020).10.1063/5.0006101 ↗
24. Safeer, C. K. et al. Spin Hall effect in bilayer graphene combined with an insulator up to room temperature. Nano Lett. 20, 4573–4579 (2020).10.1021/acs.nanolett.0c01428 ↗
25. Safeer, C. K. et al. Room-temperature spin Hall effect in graphene/MoS2 van der waals heterostructures. Nano Lett. 19, 1074–1082 (2019).10.1021/acs.nanolett.8b04368 ↗
26. Safeer, C. K. et al. Large multidirectional spin-to-charge conversion in low-symmetry semimetal MoTe2 at room temperature. Nano Lett. 19, 8758–8766 (2019).10.1021/acs.nanolett.9b03485 ↗
27. Benítez, L. A. et al. Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructures. Nat. Mater. 19, 170–175 (2020).10.1038/s41563-019-0575-1 ↗
28. Pham, V. T. et al. Spin–orbit magnetic state readout in scaled ferromagnetic/heavy metal nanostructures. Nat. Electron. 3, 309–315 (2020).10.1038/s41928-020-0395-y ↗
29. Manipatruni, S. et al. Scalable energy-efficient magnetoelectric spin–orbit logic. Nature 565, 35–42 (2019).10.1038/s41586-018-0770-2 ↗
30. Yang, H. et al. Two-dimensional materials prospects for non-volatile spintronic memories. Nature 606, 663–673 (2022).10.1038/s41586-022-04768-0 ↗
31. Lin, C. C. et al. Spin transfer torque in a graphene lateral spin valve assisted by an external magnetic field. Nano Lett. 13, 5177–5181 (2013).10.1021/nl402547m ↗
32. Cummings, A. W., Garcia, J. H., Fabian, J. & Roche, S. Giant spin lifetime anisotropy in graphene induced by proximity effects. Phys. Rev. Lett. 119, 206601 (2017).10.1103/PhysRevLett.119.206601 ↗
33. Offidani, M., Milletarì, M., Raimondi, R. & Ferreira, A. Optimal charge-to-spin conversion in graphene on transition-metal dichalcogenides. Phys. Rev. Lett. 119, 196801 (2017).10.1103/PhysRevLett.119.196801 ↗
34. Garcia, J. H., Cummings, A. W. & Roche, S. Spin Hall effect and weak antilocalization in graphene/transition metal dichalcogenide heterostructures. Nano Lett. 17, 5078–5083 (2017).10.1021/acs.nanolett.7b02364 ↗
35. Milletarì, M., Offidani, M., Ferreira, A. & Raimondi, R. Covariant conservation laws and the spin Hall effect in Dirac–Rashba systems. Phys. Rev. Lett. 119, 246801 (2017).10.1103/PhysRevLett.119.246801 ↗
36. Garcia, J. H., Vila, M., Cummings, A. W. & Roche, S. Spin transport in graphene/transition metal dichalcogenide heterostructures. Chem. Soc. Rev. 47, 3359–3379 (2018).10.1039/C7CS00864C ↗
37. Lee, S. et al. Charge-to-spin conversion in twisted graphene/WSe2 heterostructures. Phys. Rev. B 106, 165420 (2022).10.1103/PhysRevB.106.165420 ↗
38. Li, Y. & Koshino, M. Twist-angle dependence of the proximity spin–orbit coupling in graphene on transition-metal dichalcogenides. Phys. Rev. B 99, 075438 (2019).10.1103/PhysRevB.99.075438 ↗
39. Naimer, T., Zollner, K., Gmitra, M. & Fabian, J. Twist-angle dependent proximity induced spin–orbit coupling in graphene/transition metal dichalcogenide heterostructures. Phys. Rev. B 104, 195156 (2021).10.1103/PhysRevB.104.195156 ↗
40. David, A., Rakyta, P., Kormányos, A. & Burkard, G. Induced spin–orbit coupling in twisted graphene–transition metal dichalcogenide heterobilayers: twistronics meets spintronics. Phys. Rev. B 100, 085412 (2019).10.1103/PhysRevB.100.085412 ↗
41. Veneri, A., Perkins, D. T. S., Péterfalvi, C. G. & Ferreira, A. Twist angle controlled collinear Edelstein effect in van der Waals heterostructures. Phys. Rev. B 106, L081406 (2022).10.1103/PhysRevB.106.L081406 ↗
42. Péterfalvi, C. G., David, A., Rakyta, P., Burkard, G. & Kormányos, A. Quantum interference tuning of spin–orbit coupling in twisted van der Waals trilayers. Phys. Rev. Res. 4, L022049 (2022).10.1103/PhysRevResearch.4.L022049 ↗
43. Bihlmayer, G., Noël, P., Vyalikh, D. V., Chulkov, E. V. & Manchon, A. Rashba-like physics in condensed matter. Nat. Rev. Phys. 4, 642–659 (2022).10.1038/s42254-022-00490-y ↗
44. Calavalle, F. et al. Gate-tuneable and chirality-dependent charge-to-spin conversion in tellurium nanowires. Nat. Mater. 21, 526–532 (2022).10.1038/s41563-022-01211-7 ↗
45. Camosi, L. et al. Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry. 2D Mater. 9, 035014 (2022).10.1088/2053-1583/ac6fec ↗
46. Li, Y. et al. Probing symmetry properties of few-layer MoS2 and h-BN by optical second-harmonic generation. Nano Lett. 13, 3329–3333 (2013).10.1021/nl401561r ↗
47. Mennel, L., Paur, M. & Mueller, T. Second harmonic generation in strained transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2, and WSe2. APL Photonics 4, 034404 (2019).10.1063/1.5051965 ↗
48. You, Y., Ni, Z., Yu, T. & Shen, Z. Edge chirality determination of graphene by Raman spectroscopy. Appl. Phys. Lett. 93, 163112 (2008).10.1063/1.3005599 ↗
49. Krauss, B. et al. Raman scattering at pure graphene zigzag edges. Nano Lett. 10, 4544–4548 (2010).10.1021/nl102526s ↗
50. Zollner, K., João, S. M., Nikolić, B. K. & Fabian, J. Twist- and gate-tunable proximity spin–orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition metal dichalcogenides. Phys. Rev. B 108, 235166 (2023).10.1103/PhysRevB.108.235166 ↗