Now showing items 1-20 of 28

    • 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 ...
    • Atomically thin p–n junctions with van der Waals heterointerfaces 

      Lee, Chul-Ho; Lee, Gwan-Hyoung; van der Zande, Arend M.; Chen, Wenchao; Li, Yilei; Han, Minyong; Cui, Xu; Arefe, Ghidewon; Nuckolls, Colin; Heinz, Tony F.; Guo, Jing; Hone, James; Kim, Philip (Nature Publishing Group, 2014)
      Semiconductor p–n junctions are essential building blocks for electronic and optoelectronic devices. In conventional p–n junctions, regions depleted of free charge carriers form on either side of the junction, generating ...
    • Development of high frequency and wide bandwidth Johnson noise thermometry 

      Crossno, Jesse Dylan; Liu, Xiaomeng; Ohki, Thomas A.; Kim, Philip; Fong, Kin Chung (AIP Publishing, 2015)
      We develop a high frequency, wide bandwidth radiometer operating at room temperature, which augments the traditional technique of Johnson noise thermometry for nanoscale thermal transport studies. Employing low noise ...
    • Diameter-dependent thermoelectric figure of merit in single-crystalline Bi nanowires 

      Kim, Jeongmin; Lee, Seunghyun; Brovman, Yuri M.; Kim, Philip; Lee, Wooyoung (Royal Society of Chemistry (RSC), 2015)
      The diameter-dependent thermoelectric properties of individual single-crystalline Bi nanowires grown by the on-film formation of nanowires method have been investigated. The electrical resistivity, Seebeck coefficient, and ...
    • Electric field effect thermoelectric transport in individual silicon and germanium/silicon nanowires 

      Brovman, Yuri M.; Small, Joshua P.; Hu, Yongjie; Fang, Ying; Lieber, Charles M.; Kim, Philip (AIP Publishing, 2016)
      We have simultaneously measured conductance and thermoelectric power (TEP) of individual silicon and germanium/silicon core/shell nanowires in the field effect transistor device configuration. As the applied gate voltage ...
    • Electric field effects in graphene/LaAlO3/SrTiO3 heterostructures and nanostructures 

      Huang, Mengchen; Jnawali, Giriraj; Hsu, Jen-Feng; Dhingra, Shonali; Lee, Hyungwoo; Ryu, Sangwoo; Bi, Feng; Ghahari, Fereshte; Ravichandran, Jayakanth; Chen, Lu; Kim, Philip; Eom, Chang-Beom; D’Urso, Brian; Irvin, Patrick; Levy, Jeremy (AIP Publishing, 2015)
      We report the development and characterization of graphene/LaAlO3/SrTiO3 heterostructures. Complex-oxide heterostructures are created by pulsed laser deposition and are integrated with graphene using both mechanical ...
    • Epitaxial Growth of Molecular Crystals on van der Waals Substrates for High-Performance Organic Electronics 

      Lee, Chul-Ho; Schiros, Theanne; Santos, Elton J. G.; Kim, Bumjung; Yager, Kevin G.; Kang, Seok Ju; Lee, Sunwoo; Yu, Jaeeun; Watanabe, Kenji; Taniguchi, Takashi; Hone, James; Kaxiras, Efthimios; Nuckolls, Colin; Kim, Philip (Wiley-VCH Verlag Berlin, 2014)
      Epitaxial van der Waals (vdW) heterostructures of organic and layered materials are demonstrated to create high-performance organic electronic devices. High-quality rubrene films with large single-crystalline domains are ...
    • Global Ozone–CO Correlations from OMI and AIRS: Constraints on Tropospheric Ozone Sources 

      Kim, Philip; Jacob, Daniel James; Liu, Xueliang; Warner, J. X.; Yang, K.; Chance, Kelly V.; Thouret, V.; Nedelec, P. (European Geosciences Union, 2013)
      We present a global data set of free tropospheric ozone–CO correlations with 2° × 2.5° spatial resolution from the Ozone Monitoring Instrument (OMI) and Atmospheric Infrared Sounder (AIRS) satellite instruments for each ...
    • Heterostructures based on inorganic and organic van der Waals systems 

      Lee, Gwan-Hyoung; Lee, Chul-Ho; van der Zande, Arend M.; Han, Minyong; Cui, Xu; Arefe, Ghidewon; Nuckolls, Colin; Heinz, Tony F.; Hone, James; Kim, Philip (AIP Publishing, 2014)
      The two-dimensional limit of layered materials has recently been realized through the use of van der Waals (vdW) heterostructures composed of weakly interacting layers. In this paper, we describe two different classes of ...
    • Holography of the Dirac Fluid in Graphene with Two Currents 

      Seo, Yunseok; Song, Geunho; Kim, Philip; Sachdev, Subir; Sin, Sang-Jin (American Physical Society (APS), 2017)
      Recent experiments have uncovered evidence of the strongly coupled nature of graphene: the Wiedemann-Franz law is violated by up to a factor of 20 near the charge neutral point. We describe this strongly coupled plasma by ...
    • 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 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 ...
    • Inducing superconducting correlation in quantum Hall edge states 

      Lee, Gil-Ho; Huang, Katie; Efetov, Dmitri K.; Wei, Di Sonia; Hart, Sean; Taniguchi, Takashi; Watanabe, Kenji; Yacoby, Amir; Kim, Philip (Springer Nature, 2017)
      The quantum Hall (QH) effect supports a set of chiral edge states at the boundary of a two-dimensional system. A superconductor (SC) contacting these states can provide correlations of the quasiparticles in the dissipationless ...
    • Landau Level Spectroscopy of Electron-Electron Interactions in Graphene 

      Faugeras, C.; Berciaud, S.; Leszczynski, P.; Henni, Y.; Nogajewski, K.; Orlita, M.; Taniguchi, T.; Watanabe, K.; Forsythe, C.; Kim, Philip; Jalil, R.; Geim, A. K.; Basko, D. M.; Potemski, M. (American Physical Society (APS), 2015)
      We present magneto-Raman scattering studies of electronic inter-Landau level excitations in quasineutral graphene samples with different strengths of Coulomb interaction. The band velocity associated with these excitations ...
    • Magnetic resonance spectroscopy of an atomically thin material using a single-spin qubit 

      Lovchinsky, Igor; Lukin, Mikhail D.; Sanchez-Yamagishi, Javier; Urbach, Elana Kahn; Choi, Soonwon; Fang, Shiang; Andersen, Trond Ikdahl; Watanabe, Kenji; Taniguchi, Takashi; Bylinskii, Alexei; Kaxiras, Efthimios; Kim, Philip; Park, Hongkun (American Association for the Advancement of Science (AAAS), 2017)
      Two-dimensional (2D) materials offer a promising platform for exploring condensed matter phenomena and developing technological applications. However, the reduction of material dimensions to the atomic scale poses a challenge ...
    • Measurement of collective dynamical mass of Dirac fermions in graphene 

      Yoon, Hosang; Forsythe, Carlos; Wang, Lei; Tombros, Nikolaos; Watanabe, Kenji; Taniguchi, Takashi; Hone, James; Kim, Philip; Ham, Donhee (Nature Publishing Group, 2014)
      Individual electrons in graphene behave as massless quasiparticles1. Unexpectedly, it is inferred from plasmonic investigations that electrons in graphene must exhibit a non-zero mass when collectively excited. The inertial ...
    • Modulation of mechanical resonance by chemical potential oscillation in graphene 

      Chen, Changyao; Deshpande, Vikram V.; Koshino, Mikito; Lee, Sunwoo; Gondarenko, Alexander; MacDonald, Allan H.; Kim, Philip; Hone, James (Springer Nature, 2015)
      The classical picture of the force on a capacitor assumes a large density of electronic states,such that the electrochemical potential of charges added to the capacitor is given by the external electrostatic potential and ...
    • Multi-terminal transport measurements of MoS2 using a van der Waals heterostructure device platform 

      Cui, Xu; Lee, Gwan-Hyoung; Kim, Young Duck; Arefe, Ghidewon; Huang, Pinshane Y.; Lee, Chul-Ho; Chenet, Daniel A.; Zhang, Xiangwei; Wang, Lei; Ye, Fan; Pizzocchero, Filippo; Jessen, Bjarke S.; Watanabe, Kenji; Taniguchi, Takashi; Muller, David A.; Low, Tony; Kim, Philip; Hone, James (Nature Publishing Group, 2015)
      Atomically thin two-dimensional semiconductors such as MoS2 hold great promise in electrical, optical, and mechanical devices and display novel physical phenomena. However, the electron mobility of mono- and few-layer MoS2 ...
    • Nature of the quantum metal in a two-dimensional crystalline superconductor 

      Tsen, Adam; Hunt, B.; Kim, Y. D.; Yuan, Z. J.; Jia, S.; Cava, R. J.; Hone, J.; Kim, Philip; Dean, C. R.; Pasupathy, A. N. (Nature Publishing Group, 2015)
      Two-dimensional (2D) materials are not expected to be metals at low temperature owing to electron localization. Consistent with this, pioneering studies on thin films reported only superconducting and insulating ground ...
    • Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene 

      Crossno, Jesse Dylan; Shi, Jing; Wang, Ke; Liu, Xiaomeng; Harzheim, Achim; Lucas, Andrew James; Sachdev, Subir; Kim, Philip; Taniguchi, T.; Watanabe, K.; Ohki, T. A.; Fong, K. C. (American Association for the Advancement of Science (AAAS), 2016)
      Interactions between particles in quantum many-body systems can lead to collective behavior described by hydrodynamics. One such system is the electron-hole plasma in graphene near the charge neutrality point which can ...