Tailoring the band structure of twisted double bilayer graphene with pressure
| Autor: | Endre Tóvári, Takashi Taniguchi, Peter Rickhaus, Bálint Szentpéteri, Péter Makk, Folkert K. de Vries, Szabolcs Csonka, Albin Márffy, Andor Kormányos, Bálint Fülöp, Kenji Watanabe |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Letter Field (physics) Band gap Superlattice band structure Hydrostatic pressure FOS: Physical sciences Bioengineering 02 engineering and technology 01 natural sciences symbols.namesake pressure Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences General Materials Science 010306 general physics Electronic band structure continuum modeling Condensed matter physics twisted double bilayer graphene superlattice transport measurements Condensed Matter - Mesoscale and Nanoscale Physics Mechanical Engineering Fermi level General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetic field symbols 0210 nano-technology Bilayer graphene |
| Zdroj: | Nano Letters, 21 (20) Nano Letters |
| ISSN: | 1530-6984 1530-6992 |
| Popis: | Twisted two-dimensional structures open new possibilities in band structure engineering. At magic twist angles, flat bands emerge, which gave a new drive to the field of strongly correlated physics. In twisted double bilayer graphene dual gating allows changing of the Fermi level and hence the electron density and also allows tuning of the interlayer potential, giving further control over band gaps. Here, we demonstrate that by application of hydrostatic pressure, an additional control of the band structure becomes possible due to the change of tunnel couplings between the layers. We find that the flat bands and the gaps separating them can be drastically changed by pressures up to 2 GPa, in good agreement with our theoretical simulations. Furthermore, our measurements suggest that in finite magnetic field due to pressure a topologically nontrivial band gap opens at the charge neutrality point at zero displacement field. Nano Letters, 21 (20) ISSN:1530-6984 ISSN:1530-6992 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|