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Coupled oscillators and dielectric function

https://doi.org/10.1103/PhysRevB.111.115101

Das, T.; Ullrich, C_A; Jentschura, U_D (March 2025, Physical Review B)
Erratum: Temperature-dependent dielectric function of intrinsic silicon: Analytic models and atom-surface potentials [Phys. Rev. B 106 , 045202 (2022)]

https://doi.org/10.1103/PhysRevB.111.079902

Moore, C; Adhikari, C M; Das, T; Resch, L; Ullrich, C A; Jentschura, U D (February 2025, Physical Review B)

Free, publicly-accessible full text available February 5, 2026
Retardation effects in atom-wall interactions

https://doi.org/10.1103/PhysRevA.109.022808

Das, T.; Ullrich, C_A; Jentschura, U_D (February 2024, Physical Review A)
Temperature-dependent dielectric function of intrinsic silicon: Analytic models and atom-surface potentials

https://doi.org/10.1103/PhysRevB.106.045202

Moore, C.; Adhikari, C. M.; Das, T.; Resch, L.; Ullrich, C. A.; Jentschura, U. D. (July 2022, Physical Review B)
Imposters Among Us: A Supervised Learning Approach to Anomaly Detection in IoT Sensor Data

Das, T.; Shukla, R.M.; Sengupta, S. (January 2021, 2021 IEEE 7th World Forum on Internet of Things (WF-IoT). IEEE, 2021)
null (Ed.)
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Recommended electron-impact excitation and ionization cross sections for Be I

Dipti, Das T (April 2019, Atomic data and nuclear data tables)

Analytic fits to the recommended electron-impact excitation and ionization cross sections for Be I are presented. The lowest 19 terms of configurations 2snl (n≤4) and 2p2 terms below the first ionization limit are considered. The fits are based on the accurate calculations with the convergent close coupling (CCC) method as well as the B-spline R-matrix (BSR) approach. The fitted cross sections provide rate coefficients that are believed to approximate the original data within 10% with very few exceptions. The oscillator strengths for the dipole-allowed transitions between all the considered states are calculated with the relativistic multi-configuration Dirac–Hartree–Fock (MCDHF) approach and compared with the CCC and BSR results. This comparison shows a very good agreement except for a handful of cases with likely strong cancellations.
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