Jump to main content
Jump to site search


Simultaneous observation of surface- and edge-states of a 2D topological insulator through scanning tunneling spectroscopy and differential conductance imaging

Abstract

We have grown 2D form of Bi2Se3 through colloidal synthesis method that acts as a topological insulator. We have simultaneously probed surface-states and edge-states of the nanoplates through scanning tunneling spectroscopy (STS). At the interior, density of states (DOS) revealed location of conduction and valence band edges. The DOS at the edges, on the other hand, have brought out gapless conducting states along with a Dirac point at a nonzero value below the Fermi energy representing Dirac cone of a 2D topological insulator. In differential tunnel conductance (dI/dV) images recorded at different voltages, the two sections of the topological insulator could be viewed selectively or simultaneously with a clear contrast in illumination. Upon an increase in the thickness of 2D-nanoplates, the material turned into a 3D topological insulator with gapless surface-states.

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 09 Jan 2017, accepted on 14 Mar 2017, published on 14 Mar 2017 and first published online on 14 Mar 2017


Article type: Paper
DOI: 10.1039/C7CP00149E
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
  •   Request permissions

    Simultaneous observation of surface- and edge-states of a 2D topological insulator through scanning tunneling spectroscopy and differential conductance imaging

    H. Bhunia, A. Bar, A. Bera and A. J. Pal, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP00149E

Search articles by author