Szentpéteri, Bálint and Rickhaus, Peter and de Vries, Folkert K. and Márffy, Albin Máté and Fülöp, Bálint and Tóvári, Endre and Kormányos, Andor and Csonka, Szabolcs and Makk, Péter (2021) Tailoring the Band Structure of Twisted Double Bilayer Graphene with Pressure. NANO LETTERS, 21 (20). pp. 8777-8784. ISSN 1530-6984
|
Text
acs.nanolett.1c03066.pdf Available under License Creative Commons Attribution. Download (6MB) | Preview |
Abstract
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.
| Item Type: | Article |
|---|---|
| Additional Information: | Department of Physics, Budapest University of Technology and Economics, Nanoelectronics Momentum Research Group, Hungarian Academy of Sciences, Budafoki ut 8, Budapest, 1111, Hungary Department of Physics, Budapest University of Technology and Economics, Correlated Van der Waals Structures Momentum Research Group, Hungarian Academy of Sciences, Budafoki ut 8, Budapest, 1111, Hungary Solid State Physics Laboratory, ETH Zürich, Zürich, CH-8093, Switzerland Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan Department of Physics of Complex Systems, Eötvös Loránd University, Pázmány P. s. 1/A, Budapest, 1117, Hungary Export Date: 7 March 2022 CODEN: NALEF Correspondence Address: Csonka, S.; Department of Physics, Budafoki ut 8, Hungary; email: csonka.szabolcs@ttk.bme.hu Correspondence Address: Makk, P.; Department of Physics, Budafoki ut 8, Hungary; email: makk.peter@ttk.bme.hu Funding details: Horizon 2020 Framework Programme, H2020, 862660/QUANTUM E LEAPS Funding details: Japan Society for the Promotion of Science, KAKEN, 19H05790, JP20H00354 Funding details: Ministry of Education, Culture, Sports, Science and Technology, MEXT, JPMXP0112101001 Funding details: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF Funding details: Hungarian Scientific Research Fund, OTKA, K134437, TKP2020-IKA-05 Funding details: Magyar Tudományos Akadémia, MTA Funding details: National Center of Competence in Research Quantum Science and Technology, NCCR QSIT Funding details: Innovációs és Technológiai Minisztérium Funding details: National Research, Development and Innovation Office, 2017-1.2.1-NKP-2017-00001 Funding text 1: The authors thank Prof. E. Tutuc, K. Ensslin, and T. Ihn for useful discussions, and Márton Hajdú, Ferenc Fülöp, and Gergö Fülöp for their technical support. We thank Gergö Fülöp for helping in creating the device sketch. This work acknowledges support from the Topograph FlagERA network, Grant OTKA FK-123894 and Grant OTKA PD-134758. This research was supported by the Ministry of Innovation and Technology and the National Research, Development and Innovation Office within the Quantum Information National Laboratory of Hungary and by the Quantum Technology National Excellence Program (Project 2017-1.2.1-NKP-2017-00001), by SuperTop QuantERA network, and by the FET Open AndQC network and Nanocohybri COST network. P.M., E.T., and A.K. received funding from the Hungarian Academy of Sciences through the Bolyai Fellowship. A.K. acknowledges the support from the Hungarian Scientific Research Fund (OTKA) Grant K134437 and from the ELTE Institutional Excellence Program (Grant TKP2020-IKA-05). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan (Grant JPMXP0112101001) and JSPS KAKENHI (Grants 19H05790 and JP20H00354). We acknowledge support from the Graphene Flagship and from the European Union’s Horizon 2020 research and innovation program under Grant Agreement 862660/QUANTUM E LEAPS and the Swiss National Science Foundation via NCCR Quantum Science and Technology. Low T infrastructure was provided by VEKOP-2.3.3-15-2017-00015. |
| Uncontrolled Keywords: | PRESSURE; Band structure; transport measurements; superlattice; continuum modeling; twisted double bilayer graphene; |
| Subjects: | Q Science / természettudomány > QD Chemistry / kémia |
| SWORD Depositor: | MTMT SWORD |
| Depositing User: | MTMT SWORD |
| Date Deposited: | 23 Sep 2022 13:46 |
| Last Modified: | 23 Sep 2022 13:46 |
| URI: | http://real.mtak.hu/id/eprint/149591 |
Actions (login required)
 |
Edit Item |
