Details

Autor(en) / Beteiligte

• Stepanov, Petr
• Barlas, Yafis
• Espiritu, Tim
• Che, Shi
• Watanabe, Kenji
• Taniguchi, Takashi
• Smirnov, Dmitry
• Lau, Chun Ning

Titel

Tunable Symmetries of Integer and Fractional Quantum Hall Phases in Heterostructures with Multiple Dirac Bands

Ist Teil von

• Physical review letters, 2016-08, Vol.117 (7), p.076807-076807, Article 076807

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2016

Link zum Volltext

Quelle

American Physical Society

Beschreibungen/Notizen

• The copresence of multiple Dirac bands in few-layer graphene leads to a rich phase diagram in the quantum Hall regime. Using transport measurements, we map the phase diagram of BN-encapsulated ABA-stacked trilayer graphene as a function charge density n, magnetic field B, and interlayer displacement field D, and observe transitions among states with different spin, valley, orbital, and parity polarizations. Such a rich pattern arises from crossings between Landau levels from different subbands, which reflect the evolving symmetries that are tunable in situ. At D=0, we observe fractional quantum Hall (FQH) states at filling factors 2/3 and -11/3. Unlike those in bilayer graphene, these FQH states are destabilized by a small interlayer potential that hybridizes the different Dirac bands.