2011/05/04 by Heon-Jung Kim, Heon‐Jung Kim, Ki-Seok Kim +16
Materials Science · Mathematics · Physics and Astronomy · #Berry connection and curvature #Condensed matter physics #Conductivity #Dirac fermion #Fermion #Gapless playback #Geometric phase #Geometry #Graphene research and applications #Ground state #Kubo formula #Mathematics #Oscillation (cell signaling) #Physics #Quantization (signal processing) #Quantum many-body systems #Quantum mechanics #Surface (topology) #Surface states #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.84.125144
arxiv created 2011/05/04 · openalex publication_date 2011/09/30 · arxiv updated 2015/05/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Topological states of matter challenge the paradigm of symmetry breaking, characterized by gapless boundary modes and protected by the topological property of the ground state. Here, we present compelling evidence for the existence of gapless surface Dirac fermions from transport in Bi2Te3. We observe Sondheimer oscillation in magnetoresistance (MR). This oscillation originates from the quantization of motion due to the confinement of electrons within the surface layer. Based on Sondheimer's transport theory, we determine the thickness of the surface state from the oscillation data. In addition, we uncover the topological nature of the surface state, fitting consistently both the nonoscillatory part of MR and the Hall resistance. The side-jump contribution turns out to dominate around 1 T in Hall resistance while the Berry-curvature effect dominates in 3--4 T.