Orbital-Dependent Coulomb Drag in Electron-Hole Bilayer Graphene Heterostructures

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Abstract
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 a vertical displacement field. Our device enables the application of a large vertical displacement field across both layers. In addition to the well-established strong Coulomb drag between the 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 vertical 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 the vertical displacement field in interlayer Coulomb interaction within the quantum Hall regime of coupled bilayer systems.
Funding Information
  • Office of Science
  • Basic Energy Sciences
  • Division of Materials Sciences and Engineering
  • U.S. Department of Energy (DE-AC02-05CH11231)
  • U.S. Department of Energy (KCWF16)
  • Japan Society for the Promotion of Science (21H05233)
  • Japan Society for the Promotion of Science (23H02052)
  • Core Research for Evolutional Science and Technology (JPMJCR24A5)
  • Japan Science and Technology Agency
  • National Science Foundation
  • Established Program to Stimulate Competitive Research (OIA-2044049)
  • University of Nebraska-Lincoln
  • World Premier International Research Center Initiative is the program of MEXT

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