Superconductivity in Twisted Trilayer Graphene Aligned to hBN
ORAL
Abstract
Empirical evidence indicates that superconductivity in twisted bilayer graphene (TBG) is suppressed when one of the graphene layers is closely aligned to an encapsulating hexagonal boron nitride (hBN) layer. Theoretical models of TBG and twisted trilayer graphene (TTG) suggest sublattice symmetry breaking is detrimental to superconductivity, potentially accounting for this observation. Here we show that, unlike aligned TBG, superconductivity can persist in TTG when aligned to hBN. Using lateral force microscopy (LFM) to characterize the strength of hBN alignment during fabrication, we examine the transport properties of TTG devices with varying degrees of TTG-hBN alignment and explore the subtle interplay between sublattice symmetry breaking, the TTG bandstructure, and the persistence of superconductivity in these devices.
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Presenters
Joshua Swann
Columbia University
Authors
Joshua Swann
Columbia University
Aravind Devarakonda
Columbia University
Takashi Taniguchi
National Institute for Materials Science
International Center for Materials Nanoarchitectonics, National Institute for Materials Science
Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan
Advanced Materials Laboratory, National Institute for Materials Science
Kenji Watanabe
National Institute for Materials Science
NIMS
Research Center for Functional Materials, National Institute for Materials Science
Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
Research Center for Functional Materials, National Institute of Material Science, Tsukuba, Japan
National Institute of Materials Science
Advanced Materials Laboratory, National Institute for Materials Science
