Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 99: 2D materials beyond graphene: TMDCs, silicene and relatives IV
O 99.6: Talk
Thursday, March 15, 2018, 16:15–16:30, MA 043
Electronic characterization of the coexisting charge density wave and superconductivity in single-layer NbSe2 at T = 1 K — •Carmen Rubio-Verdú1, Deung-Jang Choi1, Hyejin Ryu2, Sung-Kwan Mo2, Zhi-Xun Shen3,4, José Ignacio Pascual1,5, and Miguel M. Ugeda1,5 — 1CIC nanoGUNE, San Sebastián, Spain — 2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA — 3Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California, USA — 4Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, California, USA — 5Ikerbasque, Basque Foundation for Science, Bilbao, Spain
Single-layer NbSe2 has been studied by means of low-temperature STM/STS. Our STS measurements reveal the coexistence of CDW order and 2D superconductivity at T = 1 K. We spatially mapped the conductivity of the NbSe2 layer at T = 1 K with atomic resolution to reveal strong oscillations of the depth and width of the superconducting gap with well-defined wavelength of 7 Å, coincident with that of the quasiparticle interference (QPI) patterns visible at the Fermi energy. This phenomenon is accompanied by intriguing spatial dynamics of the QPI patterns for energies within the SC gap.