Binding energies of exciton complexes in transition metal dichalcogenide monolayers and effect of dielectric environment

I Kylänpää, HP Komsa - Physical Review B, 2015 - APS
Excitons, trions, biexcitons, and exciton-trion complexes in two-dimensional transition metal
dichalcogenide sheets of MoS 2, MoSe 2, MoTe 2, WS 2, and WSe 2 are studied by means …

The Experimental Rate Constant of the S+(2D) + H2 Reaction

A Zanchet, JL Chen-Qiu, P Larregaray… - ACS Earth and Space …, 2025 - ACS Publications
Endothermic reactions such as S+(4 S)+ H 2 are not expected to play a significant role in the
chemistry of the interstellar medium (ISM). However, in some specific environments, such as …

[HTML][HTML] Path integrals: From quantum mechanics to photonics

CW Robson, Y Tamashevich, TT Rantala, M Ornigotti - APL Photonics, 2021 - pubs.aip.org
The path integral formulation of quantum mechanics, ie, the idea that the evolution of a
quantum system is determined as a sum over all the possible trajectories that would take the …

Rotational excitation of N2 by positron impact in the adiabatic rotational approximation

MV Barp, EP Seidel, F Arretche… - Journal of Physics B …, 2018 - iopscience.iop.org
In this article we present the rotational excitation cross sections of N 2 by positron impact for
energies between 1 and 10 eV. The cross sections were computed in the adiabatic …

Polarizabilities of hydrogen molecules calculated without using the Born-Oppenheimer approximation

D Sun, YP Zhang, XJ Wei, LM Wang, ZC Yan - Physical Review A, 2021 - APS
The static dipole polarizabilities of the first three lowest states of hydrogen molecules H 2,
HD, and D 2 are calculated using variationally generated wave functions in Hylleraas …

General polarizability and hyperpolarizability estimators for the path-integral Monte Carlo method applied to small atoms, ions, and molecules at finite temperatures

J Tiihonen, I Kylänpää, TT Rantala - Physical Review A, 2016 - APS
The nonlinear optical properties of matter have a broad relevance and many methods have
been invented to compute them from first principles. However, the effects of electronic …

Computation of dynamic polarizabilities and van der waals coefficients from path-integral Monte Carlo

J Tiihonen, I Kylänpää… - Journal of Chemical …, 2018 - ACS Publications
We demonstrate computation of total dynamic multipole polarizabilities using path-integral
Monte Carlo method (PIMC). The PIMC approach enables accurate thermal and …

[PDF][PDF] Equilibrium and dynamical computation schemes for vibronic models of nonadiabatic systems

N Raymond - 2023 - uwspace.uwaterloo.ca
Two computational schemes were investigated for studying vibronic models of nonadiabatic
systems: Path Integral Monte Carlo (PIMC) and vibrational electronic coupled cluster …

Static field-gradient polarizabilities of small atoms and molecules at finite temperature

J Tiihonen, I Kylänpää, TT Rantala - The Journal of Chemical Physics, 2017 - pubs.aip.org
In this work, we propose new field-free estimators of static field-gradient polarizabilities for
finite temperature path-integral Monte Carlo method. Namely, dipole–quadrupole …

Diamagnetic susceptibility from a nonadiabatic path-integral simulation of few-electron systems

A Tolvanen, J Tiihonen, TT Rantala - Physical Review A, 2022 - APS
Diamagnetism is the response of dynamical compositions of charged particles, electrons,
and nuclei, to an incident magnetic field. In this paper, we study how the finite temperature …