2012/07/10 by Zhaoguo Li, Taishi Chen, Haiyang Pan +9 · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Conductance #Dephasing #Electron #Graphene research and applications #Magnetic field #Magnetoresistance #Materials science #Mesoscopic physics #Physics #Quantum mechanics #Surface (topology) #Surface states #Ternary operation #Topological Materials and Phenomena #Topological insulator #Weak localization #cond-mat.mes-hall #cond-mat.quant-gas #quant-ph
paper · pdf · doi:10.1038/srep00595
published as Scientific Report, 2, 595, 2012
arxiv created 2012/07/10 · arxiv updated 2012/08/14 · openalex publication_date 2012/08/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The universal conductance fluctuations (UCFs), one of the most important manifestations of mesoscopic electronic interference, have not yet been demonstrated for the two-dimensional surface state of topological insulators (TIs). Even if one delicately suppresses the bulk conductance by improving the quality of TI crystals, the fluctuation of the bulk conductance still keeps competitive and difficult to be separated from the desired UCFs of surface carriers. Here we report on the experimental evidence of the UCFs of the two-dimensional surface state in the bulk insulating Bi2Te2Se microflakes. The solely-B⊥-dependent UCF is achieved and its temperature dependence is investigated. The surface transport is further revealed by weak antilocalizations. Such survived UCFs of the surface states result from the limited dephasing length of the bulk carriers in ternary crystals. The electron-phonon interaction is addressed as a secondary source of the surface state dephasing based on the temperature-dependent scaling behavior.