Stacking-dependent band gap and quantum transport in trilayer graphene
By Wenzhong Bao, L. Jing, J. Velasco, Yongjin Lee, Gang Liu, D. Tran, B. Standley, M. Aykol, S. Cronin, D. Smirnov and 4 more. 2011
434 citations recorded by the source corpus.
Graphene is an extraordinary two-dimensional (2D) system with chiral charge carriers and fascinating electronic, mechanical and thermal properties. In multilayer graphene, stacking order provides an important yet rarely explored degree of freedom for tuning its electronic properties. For instance, Bernal-stacked trilayer graphene (B-TLG) is semi-metallic with a tunable band overlap, and rhombohedral-stacked trilayer graphene (r-TLG) is predicted to be semiconducting with a tunable band gap. These multilayer graphenes are also expected to exhibit rich novel phenomena at low charge densities owing to enhanced electronic interactions and competing symmetries. Here we demonstrate the dramatically different transport properties in TLG with different stacking orders, and the unexpected spontaneous gap opening in charge neutral r-TLG. At the Dirac point, B-TLG remains metallic, whereas r-TLG becomes insulating with an intrinsic interaction-driven gap ~6 meV. In magnetic fields, well-developed quantum Hall (QH) plateaux in r-TLG split into three branches at higher fields. Such splitting is a signature of the Lifshitz transition, a topological change in the Fermi surface, that is found only in r-TLG. Our results underscore the rich interaction-induced phenomena in trilayer graphene with different stacking orders, and its potential towards electronic applications.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/934394e8111d2c1331c75803fcf7b47ce56fa4f2
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In Atomic and Molecular Physics, and Optics
In Materials Chemistry
Citations in the corpus
- Spintronics and pseudospintronics in graphene and topological insulators. (2012, background): “We do not expect collective pseudospin order to be present at room temperature in graphene systems, although recent evidence [92][93] does suggest that bilayer graphene has collective pseudospin order at low temperatures when the carrier density is very close to the neutrality point.”