title: Conductance oscillations induced by ballistic snake states in a graphene heterojunction.
abstract: The realization of p-n junctions in graphene, combined with the gapless and chiral nature of its massless Dirac fermions has led to the observation of many intriguing phenomena such as the quantum Hall effect in the bipolar regime, Klein tunnelling and Fabry-Pérot interferences, all of which involve electronic transport across p-n junctions. Ballistic snake states propagating along the p-n junctions have been predicted to induce conductance oscillations, manifesting their twisting nature. However, transport studies along p-n junctions have so far only been performed in low mobility devices. Here, we report the observation of conductance oscillations due to ballistic snake states along a p-n interface in high-quality graphene encapsulated by hexagonal boron nitride. These snake states are exceptionally robust as they can propagate over 12 μm, limited only by the size of our sample, and survive up to at least 120 K. The ability to guide carriers over a long distance provide a crucial building block for graphene-based electron optics.
authors: 1] Graphene Research Centre, National University of Singapore, Singapore 117542, Singapore [2] Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors: Thiti
authors: T
authors: Taychatanapat
authors: 1] Graphene Research Centre, National University of Singapore, Singapore 117542, Singapore [2] Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors: Jun You
authors: JY
authors: Tan
authors: 1] Graphene Research Centre, National University of Singapore, Singapore 117542, Singapore [2] Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors: Yuting
authors: Y
authors: Yeo
authors: National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
authors: Kenji
authors: K
authors: Watanabe
authors: National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
authors: Takashi
authors: T
authors: Taniguchi
authors: 1] Graphene Research Centre, National University of Singapore, Singapore 117542, Singapore [2] Department of Physics, National University of Singapore, Singapore 117542, Singapore [3] NanoCore, National University of Singapore, Singapore 117576, Singapore.
authors: Barbaros
authors: B
authors: Özyilmaz