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11 papers · 1 filter
Structural origins of electronic conduction in amorphous copper-doped alumina
K. N. Subedi, K. Prasai, M. N. Kozicki +1
We perform an {\it ab initio} modeling of amorphous copper-doped alumina (a-AlO:Cu), a prospective memory material based on resistance switching, and study the structural o…
Slow and Long-ranged Dynamical Heterogeneities in Dissipative Fluids
Karina E. Avila, Horacio E. Castillo, Katharina Vollmayr-Lee +1
A two-dimensional bidisperse granular fluid is shown to exhibit pronounced long-ranged dynamical heterogeneities as dynamical arrest is approached. Here we focus on the most direct…
Time reparametrization invariance in arbitrary range p-spin models: symmetric versus non-symmetric dynamics
Gcina A. Mavimbela, Horacio E. Castillo
We explore the existence of time reparametrization symmetry in p-spin models. Using the Martin-Siggia-Rose generating functional, we analytically probe the long-time dynamics. We p…
Ab initio determination of ion-traps in silver-doped chalcogenide glass
I. Chaudhuri, F. Inam, D. A. Drabold
We present a microscopic picture of silver dynamics in GeSe:Ag glass obtained from {\it ab initio} simulation. The dynamics of Ag is explored at two temperatures, 300K and 70…
A semi-quantitative scattering theory of amorphous materials
M. -L. Zhang, Y. Pan, F. Inam +1
It is argued that topological disorder in amorphous solids can be described by local strains related to local reference crystals and local rotations. An intuitive localization crit…
Atomistic Origin of Urbach Tails in Amorphous Silicon
Y. Pan, F. Inam, M. Zhang +1
Exponential band edges have been observed in a variety of materials, both crystalline and amorphous. In this paper, we infer the structural origins of these tails in amorphous and…