Kavli Affiliate: Feng Wang
| First 5 Authors: Zuocheng Zhang, Zuocheng Zhang, , ,
| Summary:
We report Coulomb drag studies in an electron-hole bilayer graphene
heterostructure in a magnetic field, where the orbital, spin, and valley
degrees of freedom are lifted by the combined effects of exchange interaction,
Zeeman energy, and vertical displacement field. Our device enables the
application of a large vertical displacement field in both layers. In addition
to the well-established strong Coulomb drag between Landau levels with an
orbital quantum number N = 0, we observe a Coulomb drag signal between the N =
1 Landau levels under a suitable vertical displacement field. As the
displacement field increases further, the Coulomb drag signal between N = 1
Landau levels weakens, and a Coulomb drag signal emerges between the N = 0 and
N = 1 Landau levels. These findings suggest the important roles of the orbital
index and vertical displacement field in interlayer Coulomb interactions within
the quantum Hall regime of coupled bilayer systems.
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