Browsing by Author "Bhandari, Sagar"
Now showing items 1-9 of 9
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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)