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Search Publications by

Joseph A Stroscio (Fed)

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Displaying 26 - 50 of 86

Mechanism for puddle formation in graphene

December 5, 2011
Shaffique Adam, Suyong S. Jung, Nikolai N. Klimov, Nikolai B. Zhitenev, Joseph A. Stroscio, Mark D. Stiles
Close to charge neutrality, graphene's energy landscape is highly inhomogeneous, forming a sea of electron-like and hole-like puddles that determine the properties of graphene at low carrier density. However, the details of puddle formation have remained

Graphene: Materials to devices

July 1, 2011
Jungseok Chae, Jeonghoon Ha, H. Baek, Young Kuk, Suyong S. Jung, Young J. Song, Nikolai B. Zhitenev, Joseph A. Stroscio, S.J. Woo, Y.-W. Son

Rotational Grain Boundaries in Graphene

May 12, 2011
Eric J. Cockayne, Gregory M. Rutter, N Guisinger, Jason Crain, Joseph A. Stroscio, Phillip First
Defects in graphene are of interest for their effect on electronic transport in this two-dimensional material. Point defects of typically two-fold and three-fold symmetry have long been observed in scanning tunneling microscopy (STM) studies of graphite

Microscopic Polarization in the Bilayer Graphene

April 24, 2011
Joseph A. Stroscio, Suyong S. Jung, Nikolai N. Klimov, David B. Newell, Nikolai B. Zhitenev, Gregory Rutter
Bilayer graphene has drawn significant attention due to the opening of a band gap in its low energy electronic spectrum, which offers a route to electronic applications that is not practical with single layer graphene. The gap can be either tunable through

Landau Levels and Band Bending in Few-Layer Epitaxial Graphene

April 18, 2011
Hongki Min, Shaffique Adam, Young J. Song, Joseph A. Stroscio, Mark D. Stiles, Allan H. MacDonald
The carrier density distributions in few-layer-graphene systems grown on the carbon face of silicon carbide can be radically altered by the presence of a Scanning Tunneling Microscope (STM) tip used to probe top-layer electronic properties, and by a

Evolution of Microscopic Localization in Graphene in a Magnetic Field: From Scattering Resonances to Quantum Dots.

January 9, 2011
Suyong S. Jung, Gregory M. Rutter, Nikolai Klimov, David B. Newell, Irene G. Calizo, Angela R. Hight Walker, Nikolai Zhitenev, Joseph A. Stroscio
Graphene is a unique material displaying high-mobility transport in monolayer-thin films. However, its properties are strongly dependent on interactions with substrates, local charges and environment. Scanned probe microscopies can be used to locally probe

A 10 mK Scanning Probe Microscopy Facility

December 29, 2010
Young J. Song, Alexander F. Otte, Steven R. Blankenship, Alan H. Band, Frank M. Hess, Young Kuk, Vladimir Shvarts, Zuyu Zhao, Joseph A. Stroscio
We describe the design, development and performance of a scanning probe microscopy (SPM) facility operating at a base temperature of 10 mK in magnetic fields up to 15 T. The microscope is cooled by a custom designed, fully ultra-high vacuum (UHV)

High Resolution Tunnelling Spectroscopy of a Graphene Quartet

September 9, 2010
Alexander F. Otte, Young Kuk, Yike Hu, David Torrance, Phillip First, Walt A. de Heer, Hongki Min, Shaffique Adam, Mark D. Stiles, Allan H. MacDonald, Joseph A. Stroscio
Electrons in a single sheet of graphene behave quite differently from those in traditional two-dimensional electron systems. Like massless relativistic particles, they have linear dispersion and chiral eigenstates. Furthermore, two sets of electrons

Epitaxial Graphene Electronic Structure And Transport

September 2, 2010
Joseph A. Stroscio, Walt A. de Heer, Claire Berger, Xiaosong Wu, Yike Hu, Ming Ruan, Phillip First, Robert Haddon, Benjamin Piot, Clement Faugeras, Marek Potemski
Since its inception in 2001, the science and technology of epitaxial graphene on hexagonal silicon carbide has matured into a major international effort and is poised to become the first carbon electronics platform. A historical perspective is presented

Real Space Mapping of Magnetically Quantized Graphene States

August 8, 2010
Joseph A. Stroscio, D. L. Miller, Kevin Kubista, Gregory M. Rutter, Ming Ruan, Walt A. de Heer, Markus Kindermann, Phillip N. First
In a perpendicular magnetic field, the quantized independent-electron states (Landau levels) of graphene are degenerate in the valley degree of freedom and nearly-so in spin. The momentum-space valley degeneracy traces to the equivalence of the A and B

Edge structure of epitaxial graphene islands

June 7, 2010
Gregory M. Rutter, N Guisinger, Jason Crain, Phillip N. First, Joseph A. Stroscio
Graphene islands grown epitaxially on 6H-SiC(0001) were studied using scanning tunneling microscopy and spectroscopy. Under specific growth conditions, {approzimately equal}10 nm single-layer graphene islands are observed on top of the SiC buffer layer and

Epitaxial Graphenes on Silicon Carbide

April 1, 2010
Joseph A. Stroscio, Walt A. de Heer, Phillip First, Claire Berger, Thomas Seyller, Jeong-Sun Moon
The materials science of graphene grown epitaxially on the hexagonal basal planes of SiC crystals is reviewed. We show that the growth of epitaxial graphene on Si-terminated SiC is much different than growth on the C-terminated SiC surface, and discuss the

Structural analysis of multilayer graphene via atomic moire interferometry

March 24, 2010
David L. Miller, Kevin Kubista, Gregory M. Rutter, Ming Ruan, Walt A. de Heer, Phillip First, Joseph A. Stroscio
The rotation of stacked honeycomb lattices produces an observable moir e pattern in the topography of scanning tunneling microscopy images, which have long been observed in highly-oriented pyrolytic graphite due to rotation of the surface layer relative to

Making Mn Substitutional Impurities in InAs using a Scanning Tunneling Microscope

September 29, 2009
Young J. Song, Steven C. Erwin, Gregory M. Rutter, Phillip N. First, Nikolai Zhitenev, Joseph A. Stroscio
We describe in detail a new atom-by-atom exchange manipulation technique using a scanning tunneling microscope probe. As-deposited Mn adatoms (Mnad) are exchanged one-by-one with surface In atoms (Insu) to create a Mn surface-substitutional (MnIn) and an

Observing the Quantization of Zero Mass Carriers in Graphene

May 15, 2009
Joseph A. Stroscio, Gregory M. Rutter, D. L. Miller, K. Kubista, W. A. de Heer, Phillip N. First
Application of a magnetic field to conductors causes the charge carriers to circulate in cyclotron orbits with quantized energies called Landau levels (LLs). These are equally spaced in normal metals and two-dimensional electron gases. In graphene, however

Exposure of Epitaxial Graphene on SiC(0001) to Atomic Hydrogen

March 20, 2009
N Guisinger, Gregory M. Rutter, Jason Crain, Phillip N. First, Joseph A. Stroscio
The realization of graphene-based electronics involves numerous challenges that include large-scale device fabrication and the ability to control the electronic properties of the graphene material1. As a nearly ideal 2D conductor, the electronic properties

Structural and Electronic Properties of Bilayer Epitaxial Graphene

July 1, 2008
Gregory M. Rutter, Jason Crain, N Guisinger, Phillip N. First, Joseph A. Stroscio
Scanning tunneling microscopy (STM) and spectroscopy (STS) is used to study the structural and electronic properties of bilayer epitaxial graphene on SiC(0001). Topographic images reveal that graphene conforms to the SiC interface roughness and is observed

The Atomic-Scale Investigation of Graphene Formation on 6H-SiC(0001)

July 1, 2008
N Guisinger, Gregory M. Rutter, Jason Crain, Christian Heiliger, P First, Joseph A. Stroscio
The growth of graphene on the silicon terminated face of 6H-SiC(0001) was investigated by scanning tunneling microscopy (STM) measurements. The initial stages of ultra high vacuum (UHV) graphitization resulted in the growth of individual graphene sheets on

Imaging the interface of epitaxial graphene with silicon carbide via scanning tunneling microscopy

December 14, 2007
Gregory M. Rutter, N Guisinger, Jason Crain, Emily Jarvis, Mark D. Stiles, T Li, P First, Joseph A. Stroscio
The potential for electronics based on graphene, a single layer of sp2-bonded carbon atoms, rests on the ability to fabricate graphene into useful devices. Graphene grown epitaxially on SiC substrates offers an avenue for carbon-based electronics allowing

Scattering and Interference in Epitaxial Graphene

July 13, 2007
Gregory M. Rutter, Jason Crain, T Li, P First, Joseph A. Stroscio
A single sheet of carbon, graphene, exhibits unexpected electronic properties that arise from quantum state symmetries, which restrict the scattering of its charge carriers. Understanding the role of defects in the transport properties of graphene is

Electronically Induced Atom Motion in Engineered CoCu Nanostructures

August 18, 2006
Joseph A. Stroscio, Francesca M. Tavazza, Jason Crain, Robert Celotta, Anne M. Chaka
We have measured the quantum yield for exciting the motion of a single Co atom in CoCun linear molecules constructed on a Cu(111) surface. The Co atom switched between two lattice positions during electron excitation from the tip of a scanning tunneling

Electronic Effects in Length Distribution of Atom Chains

April 17, 2006
Jason Crain, Mark D. Stiles, Joseph A. Stroscio, Daniel T. Pierce
Gold deposited on Si(553) leads to self assembly of atomic chains, which are broken into finite segments by atomic defects. Scanning tunneling microscopy is used to investigate the distribution of chain lengths and the correlation between defects

Trapping and Moving Atoms on Surfaces

December 1, 2005
Robert Celotta, Joseph A. Stroscio
We have used a scanning tunneling microscope to laterally reposition a single cobalt atom adsorbed on the (111) face of a copper crystal. We find that the atom follows a complex path determined by the trapping potential of the STM tip, the effects of