69 citations · 154 across the 4 of their papers we have counts for
9 papers
Progress towards understanding ultranonlocality through the wavevector and frequency dependence of approximate exchange-correlation kernels
Niraj K. Nepal, Aaron D. Kaplan, J. M. Pitarke +1
In the framework of time-dependent density functional theory (TDDFT), the exact exchange-correlation (xc) kernel determines the ground-state energy, excited-state e…
Opening band gaps of low-dimensional materials at the meta-GGA level of density functional approximations
Bimal Neupane, Hong Tang, Niraj K. Nepal +2
The recent TASK meta-GGA density functional [Phys. Rev. Research, 1, 033082 (2019)] is constructed with an enhanced nonlocality in the generalized Kohn-Sham scheme, and therefore h…
The Fermi-Löwdin self-interaction correction for ionization energies of organic molecules
Santosh Adhikari, Biswajit Santra, Shiqi Ruan +4
(Semi)-local density functional approximations (DFAs) suffer from self-interaction error (SIE). When the first ionization energy (IE) is computed as the negative of the highest-occ…
Formation energy puzzle in intermetallic alloys: Random phase approximation fails to predict accurate formation energies
Niraj K. Nepal, Santosh Adhikari, Bimal Neupane +1
We performed density functional calculations to estimate the formation energies of intermetallic alloys. We used two semilocal approximations, the generalized gradient approximatio…
Constraint-based Wavevector- and Frequency-dependent Exchange-Correlation Kernel of the Uniform Electron Gas
Adrienn Ruzsinszky, Niraj K. Nepal, J. M. Pitarke +1
According to time-dependent density functional theory, the exact exchange-correlation kernel f(n, q, ) determines not only the ground-state energy but also the excited-st…
Understanding plasmon dispersion in nearly-free-electron metals: the relevance of exact constraints for novel exchange-correlation kernels within time-dependent density functional theory
Niraj K. Nepal, Santosh Adhikari, Bimal Neupane +3
Small-wavevector excitations in Coulomb-interacting systems can be decomposed into the high-energy collective longitudinal plasmon and the low-energy single-electron excitations. A…