Browsing by Author "Bhandari, Sagar"

Now showing items 1-9 of 9

    • Analysis of Scanned Probe Images for Magnetic Focusing in Graphene 

      Bhandari, Sagar; Lee, Gil-Ho; Kim, Philip; Westervelt, Robert M. (Springer Nature, 2017)
      We have used cooled scanning probe microscopy (SPM) to study electron motion in nanoscale devices. The charged tip of the microscope was raster-scanned at constant height above the surface as the conductance of the device ...

    • Direct Imaging of Atomic-Scale Ripples in Few-Layer Graphene 

      Wang, Wei Li; Bhandari, Sagar; Yi, Wei; Bell, David C.; Westervelt, Robert M.; Kaxiras, Efthimios (American Chemical Society, 2012)
      Graphene has been touted as the prototypical two-dimensional solid of extraordinary stability and strength. However, its very existence relies on out-of-plane ripples as predicted by theory and confirmed by experiments. ...

    • Imaging Cyclotron Orbits of Electrons in Graphene 

      Bhandari, Sagar; Lee, Gil-Ho; Klales, Anna Margaret; Watanabe, Kenji; Taniguchi, Takashi; Heller, Eric J.; Kim, Philip; Westervelt, Robert M. (American Chemical Society (ACS), 2016)
      Electrons in graphene can travel for several microns without scattering at low temperatures, and their motion becomes ballistic, following classical trajectories. When a magnetic field B is applied perpendicular to the ...

    • Imaging electron flow and quantum dot formation in MoS2 nanostructures 

      Bhandari, Sagar; Wang, Ke; Watanabe, Kenji; Taniguchi, Takashi; Kim, Philip; Westervelt, Robert (IOP, 2017)
      Among newly discovered two-dimensional (2D) materials, semiconducting ultrathin sheets of MoS2 show potential for nanoelectronics. However, the carrier mobility in MoS2 is limited by scattering from surface impurities and ...

    • Imaging Electron Flow in Graphene 

      Bhandari, Sagar (2015-05-07)
      Scanning probe techniques can be used to probe electronic properties at the nanoscale, to shed light on the physics of nanoscale devices: Graphene is of great interest for its promise in both applied (e.g. spintronics and ...

    • Imaging Electron Motion in a Few Layer MoS2 Device 

      Bhandari, Sagar; Wang, Ke; Watanabe, K; Taniguchi, T; Kim, Philip; Westervelt, Robert M. (IOP Publishing, 2017)
      Ultrathin sheets of MoS2 are a newly discovered 2D semiconductor that holds great promise for nanoelectronics. Understanding the pattern of current flow will be crucial for developing devices. In this talk, we present ...

    • Imaging electron motion in graphene 

      Bhandari, Sagar; Westervelt, Robert M. (IOP Publishing, 2017)
      A cooled scanning probe microscope (SPM) is an ideal tool to image electronic motion in graphene: the SPM tip acts as a scanning gate, which interacts with the electron gas below. We introduce the technique using our group's ...

    • Investigating the Transition Region in Scanned Probe Images of the Cyclotron Orbit in Graphene 

      Bhandari, Sagar; Lin, Andrew; Westervelt, Robert (American Scientific Publishers, 2017-09-01)
      A cooled scanning probe microscope (SPM) has been used to image cyclotron orbits of electrons through high-mobility graphene in a magnetic field.1-5 In a hBN-graphene-hBN device patterned into a hall bar geometry, the ...

    • Topological Graphene Imaging and Fabrication of Devices 

      Bell, David C.; Wang, Wei Li; Bhandari, Sagar; Westervelt, Robert M.; Kaxiras, Efthimios (Microscopy Society of America, 2012)