Electric field tunable bandgap in twisted double trilayer graphene
Source abstract
Abstract
Abstract Twisted van der Waals heterostructures have recently emerged as a versatile platform for engineering interaction-driven, topological phenomena with a high degree of control and tunability. Since the initial discovery of correlated phases in twisted bilayer graphene, a wide range of moiré materials have emerged with fascinating electronic properties. While the field of twistronics has rapidly evolved and now includes a range of multi-layered systems, moiré systems comprised of double trilayer graphene remain elusive. Here, we report electrical transport measurements combined with tight-binding calculations in twisted double trilayer graphene (TDTLG). We demonstrate that small-angle TDTLG (~1.7−2.0∘) exhibits an intrinsic bandgap at the charge neutrality point. Moreover, by tuning the displacement field, we observe a continuous insulator-semimetal-insulator transition at the CNP, which is also captured by tight-binding calculations. These results establish TDTLG systems as a highly tunable platform for further exploration of magneto-transport and optoelectronic properties.
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Research context
OpenAlex topics: Graphene research and applications · Quantum and electron transport phenomena · 2D Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
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1. Cao, Y. et al. Correlated insulator behaviour at half-filling in magic-angle graphene superlattices. Nature 556, 80 (2018).10.1038/nature26154 ↗
2. Cao, Y. et al. Unconventional superconductivity in magic-angle graphene superlattices. Nature 556, 43 (2018).10.1038/nature26160 ↗
3. Chen, G. et al. Signatures of tunable superconductivity in a trilayer graphene moiré superlattice. Nature 572, 215–219 (2019).10.1038/s41586-019-1393-y ↗
4. Chen, G. et al. Evidence of a gate-tunable mott insulator in a trilayer graphene moiré superlattice. Nat. Phys. 15, 237–241 (2019).10.1038/s41567-018-0387-2 ↗
5. Shen, C. et al. Correlated states in twisted double bilayer graphene. Nat. Phys. 16, 520–525 (2020).10.1038/s41567-020-0825-9 ↗
6. Liu, X. et al. Tunable spin-polarized correlated states in twisted double bilayer graphene. Nature 583, 221–225 (2020).10.1038/s41586-020-2458-7 ↗
7. Cao, Y. et al. Tunable correlated states and spin-polarized phases in twisted bilayer–bilayer graphene. Nature 583, 215–220 (2020).10.1038/s41586-020-2260-6 ↗
8. Chen, S. et al. Electrically tunable correlated and topological states in twisted monolayer-bilayer graphene. Nat. Phys. 17, 374–380 (2021).10.1038/s41567-020-01062-6 ↗
9. Xu, S. et al. Tunable van hove singularities and correlated states in twisted monolayer–bilayer graphene. Nat. Phys. 17, 619–626 (2021).10.1038/s41567-021-01172-9 ↗
10. Park, J. M., Cao, Y., Watanabe, K., Taniguchi, T. & Jarillo-Herrero, P. Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene. Nature 590, 249–255 (2021).10.1038/s41586-021-03192-0 ↗
11. Hao, Z. et al. Electric field-tunable superconductivity in alternating-twist magic-angle trilayer graphene. Science 371, 1133–1138 (2021).10.1126/science.abg0399 ↗
12. Park, J. M. et al. Robust superconductivity in magic-angle multilayer graphene family. Nat. Mater. 21, 877–883 (2022).10.1038/s41563-022-01287-1 ↗
13. Wang, L. et al. Correlated electronic phases in twisted bilayer transition metal dichalcogenides. Nat. Mater. 19, 861–866 (2020).10.1038/s41563-020-0708-6 ↗
14. Zhang, Z. et al. Flat bands in twisted bilayer transition metal dichalcogenides. Nat. Phys. 16, 1093–1096 (2020).10.1038/s41567-020-0958-x ↗
15. Lu, X. et al. Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene. Nature 574, 653–657 (2019).10.1038/s41586-019-1695-0 ↗
16. Serlin, M. et al. Intrinsic quantized anomalous hall effect in a moiré heterostructure. Science 367, 900–903 (2020).10.1126/science.aay5533 ↗
17. Sharpe, A. L. et al. Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene. Science 365, 605–608 (2019).10.1126/science.aaw3780 ↗
18. Bhowmik, S. et al. Spin-orbit coupling-enhanced valley ordering of malleable bands in twisted bilayer graphene on wse2. Nat. Commun. 14, 4055 (2023).10.1038/s41467-023-39855-x ↗
19. Ghiotto, A. et al. Quantum criticality in twisted transition metal dichalcogenides. Nature 597, 345–349 (2021).10.1038/s41586-021-03815-6 ↗
20. Ghawri, B. et al. Breakdown of semiclassical description of thermoelectricity in near-magic angle twisted bilayer graphene. Nat. Commun. 13, 1522 (2022).10.1038/s41467-022-29198-4 ↗
21. Regan, E. C. et al. Mott and generalized wigner crystal states in wse2/ws2 moiré superlattices. Nature 579, 359–363 (2020).10.1038/s41586-020-2092-4 ↗
22. Li, H. et al. Imaging two-dimensional generalized wigner crystals. Nature 597, 650–654 (2021).10.1038/s41586-021-03874-9 ↗
23. Zhang, F., Sahu, B., Min, H. & MacDonald, A. H. Band structure of a b c-stacked graphene trilayers. Phys. Rev. B 82, 035409 (2010).10.1103/PhysRevB.82.035409 ↗
24. Zhou, H. et al. Half-and quarter-metals in rhombohedral trilayer graphene. Nature 598, 429–433 (2021).10.1038/s41586-021-03938-w ↗
25. Zhou, H., Xie, T., Taniguchi, T., Watanabe, K. & Young, A. F. Superconductivity in rhombohedral trilayer graphene. Nature 598, 434–438 (2021).10.1038/s41586-021-03926-0 ↗
26. Halbertal, D. et al. Unconventional non-local relaxation dynamics in a twisted trilayer graphene moiré superlattice. Nat. Commun. 13, 7587 (2022).10.1038/s41467-022-35213-5 ↗
27. Kim, K. et al. van der waals heterostructures with high accuracy rotational alignment. Nano Lett. 16, 1989–1995 (2016).10.1021/acs.nanolett.5b05263 ↗
28. Cao, Y. et al. Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene. Phys. Rev. Lett. 117, 116804 (2016).10.1103/PhysRevLett.117.116804 ↗
29. Khodkov, T., Khrapach, I., Craciun, M. F. & Russo, S. Direct observation of a gate tunable band gap in electrical transport in abc-trilayer graphene. Nano Lett. 15, 4429–4433 (2015).10.1021/acs.nanolett.5b00772 ↗
30. Dean, C. R. et al. Boron nitride substrates for high-quality graphene electronics. Nat. Nanotechnol. 5, 722–726 (2010).10.1038/nnano.2010.172 ↗
31. Scherwitzl, R. et al. Metal-insulator transition in ultrathin lanio 3 films. Phys. Rev. Lett. 106, 246403 (2011).10.1103/PhysRevLett.106.246403 ↗
32. Yang, W. et al. Hofstadter butterfly and many-body effects in epitaxial graphene superlattice. Nano Lett. 16, 2387–2392 (2016).10.1021/acs.nanolett.5b05161 ↗
33. Wu, Q., Zhang, S., Song, H.-F., Troyer, M. & Soluyanov, A. A. Wanniertools: an open-source software package for novel topological materials. Comput. Phys. Commun. 224, 405–416 (2018).10.1016/j.cpc.2017.09.033 ↗
34. Thompson, A. P. et al. Lammps-a flexible simulation tool for particle-based materials modeling at the atomic, meso, and continuum scales. Comput. Phys. Commun. 271, 108171 (2022).10.1016/j.cpc.2021.108171 ↗
35. Choi, Y. W. & Choi, H. J. Intrinsic band gap and electrically tunable flat bands in twisted double bilayer graphene. Phys. Rev. B 100, 201402 (2019).10.1103/PhysRevB.100.201402 ↗
36. Haddadi, F., Wu, Q., Kruchkov, A. J. & Yazyev, O. V. Moiré flat bands in twisted double bilayer graphene. Nano Lett. 20, 2410–2415 (2020).10.1021/acs.nanolett.9b05117 ↗
37. Lui, C. H., Li, Z., Mak, K. F., Cappelluti, E. & Heinz, T. F. Observation of an electrically tunable band gap in trilayer graphene. Nat. Phys. 7, 944–947 (2011).10.1038/nphys2102 ↗
38. Deng, B. et al. Strong mid-infrared photoresponse in small-twist-angle bilayer graphene. Nat. Photon. 14, 549–553 (2020).10.1038/s41566-020-0644-7 ↗
39. Wang, L. et al. One-dimensional electrical contact to a two-dimensional material. Science 342, 614–617 (2013).10.1126/science.1244358 ↗
40. De Laissardiere, G. T., Mayou, D. & Magaud, L. Numerical studies of confined states in rotated bilayers of graphene. Phys. Rev. B 86, 125413 (2012).10.1103/PhysRevB.86.125413 ↗
41. Brenner, D. W. et al. A second-generation reactive empirical bond order (rebo) potential energy expression for hydrocarbons. J. Phys. Condens. Matter 14, 783 (2002).10.1088/0953-8984/14/4/312 ↗
42. Kolmogorov, A. N. & Crespi, V. H. Registry-dependent interlayer potential for graphitic systems. Phys. Rev. B 71, 235415 (2005).10.1103/PhysRevB.71.235415 ↗
43. Bitzek, E., Koskinen, P., Gähler, F., Moseler, M. & Gumbsch, P. Structural relaxation made simple. Phys. Rev. Lett. 97, 170201 (2006).10.1103/PhysRevLett.97.170201 ↗