Match!
D. K. Gaskill
United States Naval Research Laboratory
111Publications
35H-index
4,151Citations
Publications 112
Newest
#1Matthew T. Dejarld (NRL: United States Naval Research Laboratory)H-Index: 1
#2Paul M. Campbell (NRL: United States Naval Research Laboratory)H-Index: 36
Last.D. K. Gaskill (NRL: United States Naval Research Laboratory)H-Index: 35
view all 10 authors...
Metal films deposited on graphene are known to influence its electronic properties, but little is known about graphene’s interactions with very low work function rare earth metals. Here we report on the work functions of a wide range of metals deposited on n-type epitaxial graphene (EG) as measured by Kelvin Probe Force Microscopy (KPFM). We compare the behaviors of rare earth metals (Pr, Eu, Er, Yb, and Y) with commonly used noble metals (Cr, Cu, Rh, Ni, Au, and Pt). The rare earth films oxidiz...
1 CitationsSource
#1J. DavisH-Index: 1
#2M. SydorH-Index: 1
Last.D. K. GaskillH-Index: 35
view all 3 authors...
Non -destructive characterization of carrier concentration and thicknessuniformity for semiconductors using infrared reflectance spectroscopyD. K. Gaskill, J. Davis, R.S.Sillmon, and M. Sydor*Naval Research LaboratoryWashington, DC 20375-5000AbstractInfrared reflectance spectroscopy, in the range of 4000 to 250 cm -1, has been used tonon -destructively characterize the carrier concentration and thickness of n -type epitaxialGaN and AlxGa1_xAs and S -doped bulk InP. Measurements of carrier concen...
#1Mohammad M. Jadidi (UMD: University of Maryland, College Park)H-Index: 8
#2Andrei B. Sushkov (UMD: University of Maryland, College Park)H-Index: 17
Last.Thomas E. Murphy (UMD: University of Maryland, College Park)H-Index: 32
view all 10 authors...
Graphene plasmonics has the potential to revolutionize terahertz technology — the last great underdeveloped frequency band of electromagnetic waves. We describe here recent research on large-area tunable graphene plasmonic materials and devices for use in terahertz detectors, modulators, and filters.
Source
Jun 1, 2016 in DRC (Device Research Conference)
#1Kevin M. DanielsH-Index: 9
#2Mohammad M. Jadidi (UMD: University of Maryland, College Park)H-Index: 8
Last.D. K. Gaskill (NRL: United States Naval Research Laboratory)H-Index: 35
view all 9 authors...
Graphene's ability to support and manipulate THz surface plasmon polaritons make it an ideal material for tunable THz detectors operating at room temperature [1]. Currently, however, THz plasmonic resonances in epitaxially grown graphene result in broad line widths (γ) >100 cm−1 at the plasmon resonance frequency [2]. This is attributed to the partially covalent bonding between the silicon carbide (SiC) substrate and the 6√3 buffer layer between the substrate and epitaxial graphene (EG), inducin...
Source
#1Michael S. OsofskyH-Index: 26
Last.D. K. GaskillH-Index: 35
view all 7 authors...
Reports of metallic behavior in two-dimensional (2D) systems such as high mobility metal-oxide field effect transistors, insulating oxide interfaces, graphene, and MoS2 have challenged the well-known prediction of Abrahams, et al. that all 2D systems must be insulating. The existence of a metallic state for such a wide range of 2D systems thus reveals a wide gap in our understanding of 2D transport that has become more important as research in 2D systems expands. A key to understanding the 2D me...
10 CitationsSource
#1Mohammad M. JadidiH-Index: 8
#2Andrei B. SushkovH-Index: 17
Last.Thomas E. MurphyH-Index: 32
view all 10 authors...
#1Jian Huang (University of Oxford)H-Index: 7
#2Jack A. Alexander-Webber (University of Oxford)H-Index: 14
Last.Robin J. Nicholas (University of Oxford)H-Index: 39
view all 11 authors...
Energy relaxation of hot Dirac fermions in bilayer epitaxial graphene is experimentally investigated by magnetotransport measurements on Shubnikov-de Haas oscillations and weak localization. The hot-electron energy loss rate is found to follow the predicted Bloch-Gruneisen power-law behaviour of T-4 at carrier temperatures from 1.4K up to similar to 100 K, due to electron-acoustic phonon interactions with a deformation potential coupling constant of 22 eV. A carrier density dependence n(e)(-1.5)...
13 CitationsSource
#1P. Xu (UA: University of Arkansas)H-Index: 9
#2D. Qi (UA: University of Arkansas)H-Index: 7
Last.F. M. Peeters (University of Antwerp)H-Index: 64
view all 12 authors...
Abstract Epitaxial graphene is grown on a non-polar n + 6H-SiC m-plane substrate and studied using atomic scale scanning tunneling microscopy. Multilayer graphene is found throughout the surface and exhibits rotational disorder. Moire patterns of different spatial periodicities are found, and we found that as the wavelength increases, so does the amplitude of the modulations. This relationship reveals information about the interplay between the energy required to bend graphene and the interactio...
11 CitationsSource
#1Anindya Nath (GMU: George Mason University)H-Index: 8
#2Andrew D. Koehler (NRL: United States Naval Research Laboratory)H-Index: 13
Last.Mulpuri V. Rao (GMU: George Mason University)H-Index: 27
view all 12 authors...
It is well-known that the performance of graphene electronic devices is often limited by extrinsic scattering related to resist residue from transfer, lithography, and other processes. Here, we report a polymer-assisted fabrication procedure that produces a clean graphene surface following device fabrication by a standard lithography process. The effectiveness of this improved lithography process is demonstrated by examining the temperature dependence of epitaxial graphene-metal contact resistan...
21 CitationsSource
#1Sandra C. Hernández (NRL: United States Naval Research Laboratory)H-Index: 15
#2Virginia D. Wheeler (NRL: United States Naval Research Laboratory)H-Index: 16
Last.Scott G. Walton (NRL: United States Naval Research Laboratory)H-Index: 21
view all 14 authors...
Abstract Epitaxial graphene is promising material for future graphene-based applications including high frequency devices and chemical/biological sensors. Modifying the surface chemistry of graphene allows one to control its properties and thus provides a promising route towards further broadening the device application space for this unique material. Herein, we demonstrate the use of electron beam generated plasmas as a route towards controlled oxygen doping of epitaxial graphene. X-ray photoel...
12 CitationsSource
12345678910