76 citations · 152 across the 7 of their papers we have counts for
7 papers
Crystalline hydrogenation of graphene by STM tip-induced field dissociation of H
S. J. Tjung, S. M. Hollen, G. A. Gambrel +3
We have developed a novel method for crystalline hydrogenation of graphene on the nanoscale. Molecular hydrogen was physisorbed at 5 K onto pristine graphene islands grown on Cu(11…
Superconductor to Insulator Transition Tuned by Random Gauge Fields
H. Q. Nguyen, S. M. Hollen, J. M. Valles +2
Typically the disorder that alters the interference of particle waves to produce Anderson localization is potential scattering from randomly placed impurities. Here we show that di…
Native defects in ultra-high vacuum grown graphene islands on Cu(111)
S. M. Hollen, S. J. Tjung, K. R. Mattioli +4
We present a scanning tunneling microscopy (STM) study of native defects in graphene islands grown by ultra-high vacuum (UHV) decomposition of ethylene on Cu(111). We characterize…
Collapse of the Cooper pair phase coherence length at a superconductor to insulator transition
S. M. Hollen, G. E. Fernandes, J. M. Xu +1
We present investigations of the superconductor to insulator transition (SIT) of uniform a-Bi films using a technique sensitive to Cooper pair phase coherence. The films are perfor…
Cooper pair islanding model of insulating nanohoneycomb films
S. M. Hollen, J. M. Valles
We first review evidence for the Cooper pair insulator (CPI) phase in amorphous nanohoneycomb (NHC) films. We then extend our analysis of superconducting islands induced by film th…
Cooper pair insulator in amorphous films induced by nanometer-scale thickness variations
S. M. Hollen, H. Q. Nguyen, E. Rudisaile +4
Unusual transport properties of superconducting (SC) materials, such as the under doped cuprates, low dimensional superconductors in strong magnetic fields, and insulating films ne…
Observation of Giant Positive Magnetoresistance in a Cooper Pair Insulator
H. Q. Nguyen, S. M. Hollen, M. D. Stewart +4
Ultrathin amorphous Bi films, patterned with a nano-honeycomb array of holes, can exhibit an insulating phase with transport dominated by the incoherent motion of Cooper pairs of e…