140 citations · 298 across the 11 of their papers we have counts for
11 papers
Generalized Nested Summation of Powers of Natural Numbers
Patibandla Chanakya, Putla Harsha
In this paper, we provide a general framework for obtaining the formula for nested summation of powers of natural numbers. We define a special triangular array of numbers from whic…
Weighted Inner Products for GMRES and GMRES-DR
Mark Embree, Ronald B. Morgan, Huy V. Nguyen
The convergence of the restarted GMRES method can be significantly improved, for some problems, by using a weighted inner product that changes at each restart. How does this weight…
Comment on arXiv:0709.3700 "Orientation dependence of the optical spectra in graphene at high frequencies"
Viet Hung Nguyen, Huy-Viet Nguyen
Zhang et al. reported in [Phys. Rev. B 77, 241402(R) (2008)] a theoretical study of the optical spectra of monolayer graphene employing the Kubo formula within a tight-binding mode…
Enhanced Seebeck effect in graphene devices by strain and doping engineering
Mai Chung Nguyen, Viet Hung Nguyen, Huy-Viet Nguyen +2
In this work, we investigate the possibility of enhancing the thermoelectric power (Seebeck coefficient) in graphene devices by strain and doping engineering. While a local strain…
Strain-induced conduction gap in vertical devices made of twisted graphene layers
Viet Hung Nguyen, Huy-Viet Nguyen, Jerome Saint Martin +1
We investigate the effects of uniaxial strain on the transport properties of vertical devices made of two twisted graphene layers, which partially overlap each other. We find that…
Enhanced thermoelectric figure of merit in vertical graphene junctions
V. Hung Nguyen, M. Chung Nguyen, Huy-Viet Nguyen +2
In this work, we investigate thermoelectric properties of junctions consisting of two partially overlapped graphene sheets coupled to each other in the cross-plane direction. It is…
Conduction gap in graphene strain junctions: direction dependence
Mai Chung Nguyen, Viet Hung Nguyen, Huy-Viet Nguyen +1
It has been shown in a recent study [Nguyen et al., Nanotechnol. \textbf{25}, 165201 (2014)] that unstrained/strained graphene junctions are promising candidates to improve the per…
Improved performance of graphene transistors by strain engineering
Viet Hung Nguyen, Huy Viet Nguyen, Philippe Dollfus
By means of numerical simulation, we study in this work the effects of uniaxial strain on transport properties of strained graphene heterojunctions and explore the possibility to a…
Disorder effects on energy bandgap and electronic transport in graphene-nanomesh-based structures
Viet Hung Nguyen, Mai Chung Nguyen, Huy Viet Nguyen +1
Using atomistic quantum simulation based on a tight binding model, we investigate the formation of energy gap Eg of graphene nanomesh (GNM) lattices and the transport characteristi…
Van der Waals Coefficients of Atoms and Molecules from a Simple Approximation for the Polarizability
Huy-Viet Nguyen, Stefano de Gironcoli
A simple and computationally efficient scheme to calculate approximate imaginary-frequency dependent polarizability, hence asymptotic van der Waals coefficient, within density func…
Efficient and accurate calculation of exact exchange and RPA correlation energies in the Adiabatic-Connection Fluctuation-Dissipation theory
Huy-Viet Nguyen, Stefano de Gironcoli
Recently there has been a renewed interest in the calculation of exact-exchange and RPA correlation energies for realistic systems. These quantities are main ingredients of the so-…