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12 papers · 2 filters
Anomalous Nuclear Quantum Effects in Ice
B. Pamuk, J. M. Soler, R. Ramirez +4
One striking anomaly of water ice has been largely neglected and never explained. Replacing hydrogen (H) by deuterium (H) causes ice to expand, whereas the "normal" isotope…
Measurements and ab initio Molecular Dynamics Simulations of the High Temperature Ferroelectric Transition in Hexagonal RMnO3
T. A. Tyson, T. Wu, H. Y. Chen +5
Measurements of the structure of hexagonal RMnO3 (R=rare earths (Ho) and Y) for temperatures significantly above the ferroelectric transition temperature (TFE) were conducted to de…
Visualizing Individual Nitrogen Dopants in Monolayer Graphene
Liuyan Zhao, Rui He, Kwang Taeg Rim +15
In monolayer graphene, substitutional doping during growth can be used to alter its electronic properties. We used scanning tunneling microscopy (STM), Raman spectroscopy, x-ray sp…
Mobility-dependent Low-frequency Noise in Graphene Field Effect Transistors
Yan Zhang, E. E. Mendez, Xu Du
We have investigated the low-frequency 1/f noise of both suspended and on-substrate graphene field-effect transistors and its dependence on gate voltage, in the temperature range b…
Periodic Variation of Stress in Sputter Deposited Si/WSi2 Multilayers
Kimberley MacArthur, Bing Shi, Ray Conley +1
A tension increment after sputter deposition of 1 nm of WSi2 onto sputtered Si was observed at low Ar gas pressures. Wafer curvature data on multilayers were found to have a period…
Lattice dynamical origin of peak thermoelectric performance in AgPbmSbTe2+m observed by inelastic neutron scattering
M. E. Manley, S. Shapiro, Q. Li +2
Phonon densities of states (DOS) for the high performing thermoelectric material, AgPbmSbTe2+m (LAST-m, m = 16, 18, and 20), were extracted from time-of-flight inelastic neutron sc…