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Orbitally controlled quantum Hall states in decoupled two-bilayer graphene sheets
Soyun Kim, Dohun Kim, Kenji Watanabe +3
We report on integer and fractional quantum Hall states in a stack of two twisted Bernal bilayer graphene sheets. By exploiting the momentum mismatch in reciprocal space, we suppre…
Odd integer quantum Hall states with interlayer coherence in twisted bilayer graphene
Youngwook Kim, Pilkyung Moon, Kenji Watanabe +2
We report on the quantum Hall effect in two stacked graphene layers rotated by 2 degree. The tunneling strength among the layers can be varied from very weak to strong via the mech…
Rectification by hydrodynamic flow in an encapsulated graphene Tesla valve
Johannes Geurs, Youngwook Kim, Kenji Watanabe +3
Systems in which interparticle interactions prevail can be described by hydrodynamics. This regime is typically difficult to access in the solid state for electrons. However, the h…
Nanoscale imaging of equilibrium quantum Hall edge currents and of the magnetic monopole response in graphene
Aviram Uri, Youngwook Kim, Kousik Bagani +9
The recently predicted topological magnetoelectric effect and the response to an electric charge that mimics an induced mirror magnetic monopole are fundamental attributes of topol…
Anomalously large spin-current voltages on the surface of SmB
Johannes Geurs, Gihun Ryu, Chengtian Lin +1
The spin-polarized surface states of topological insulators have attracted interest both from a fundamental and applied point of view. A recent proposal describes a method of probi…
Single spin resonance in a van der Waals embedded paramagnetic defect
Nathan Chejanovsky, Amlan Mukherjee, Youngwook Kim +7
Spins constitute a group of quantum objects forming a key resource in modern quantum technology. Two-dimensional (2D) van der Waals materials are of fundamental interest for studyi…