432 citations · 5.7k across the 212 of their papers we have counts for
24 papers · 1 filter
Long-Range Tails in van der Waals Interactions of Excited-State and Ground-State Atoms
U. D. Jentschura, V. Debierre
A quantum electrodynamic calculation of the interaction of an excited-state atom with a ground-state atom is performed. For an excited reference state and a lower-lying virtual sta…
Virtual Resonant Emission and Oscillatory Long-Range Tails in van der Waals Interactions of Excited States: QED Treatment and Applications
U. D. Jentschura, C. M. Adhikari, V. Debierre
We report on a quantum electrodynamic (QED) investigation of the interaction between a ground state atom with another atom in an excited state. General expressions, applicable to a…
Adjacency Graphs and Long-Range Interactions of Atoms in Quasi-Degenerate States: Applied Graph Theory
C. M. Adhikari, V. Debierre, U. D. Jentschura
We analyze, in general terms, the evolution of energy levels in quantum mechanics, as a function of a coupling parameter, and demonstrate the possibility of level crossings in syst…
Theory of noncontact friction for atom-surface interactions
U. D. Jentschura, M. Janke, M. DeKieviet
The noncontact (van der Waals) friction is an interesting physical effect which has been the subject of controversial scientific discussion. The "direct" friction term due to the t…
Non-Resonant Two-Photon Transitions in Length and Velocity Gauges
U. D. Jentschura
We reexamine the invariance of two-photon transition matrix elements and corresponding two-photon Rabi frequencies under the "gauge" transformation from the length to the velocity…
Non-Contact Friction for Ion-Surface Interactions
U. D. Jentschura, G. Lach
Non-contact friction forces are exerted on physical systems through dissipative processes, when the two systems are not in physical contact with each other, or, in quantum mechanic…
Functional Form of the Imaginary Part of the Atomic Polarizability
U. D. Jentschura, K. Pachucki
The dynamic atomic polarizability describes the response of the atom to incoming electromagnetic radiation. The functional form of the imaginary part of the polarizability for smal…
Long-Range Atom-Wall Interactions and Mixing Terms: Metastable Hydrogen
U. D. Jentschura
We investigate the interaction of metastable 2S hydrogen atoms with a perfectly conducting wall, including parity-breaking S-P mixing terms (with full account of retardation). The…
One-Loop Dominance in the Imaginary Part of the Polarizability: Application to Blackbody and Non-Contact van der Waals Friction
U. D. Jentschura, G. Lach, M. De Kieviet +1
Phenomenologically important quantum dissipative processes include black-body friction (an atom absorbs counterpropagating blue-shifted photons and spontaneously emits them in all…
Dirac Equations with Confining Potentials
J. H. Noble, U. D. Jentschura
This paper is devoted to a study of relativistic eigenstates of Dirac particles which are simultaneously bound by a static Coulomb potential and added linear confining potentials.…
Theoretical study of the Compton effect with correlated three-photon emission: From the differential cross section to high-energy triple-photon entanglement
E. Lötstedt, U. D. Jentschura
The three-photon Compton effect is studied. An incoming photon undergoes triple scattering off a free electron, which leads to the emission of three entangled photons. We investiga…
Generalized Householder Transformations for the Complex Symmetric Eigenvalue Problem
J. H. Noble, M. Lubasch, U. D. Jentschura
We present an intuitive and scalable algorithm for the diagonalization of complex symmetric matrices, which arise from the projection of pseudo--Hermitian and complex scaled Hamilt…
Triple Compton effect: A photon splitting into three upon collision with a free electron
E. Lötstedt, U. D. Jentschura
The process in which a photon splits into three after the collision with a free electron (triple Compton effect) is the most basic process for the generation of a high-energy multi…
Correlated two-photon emission by transitions of Dirac-Volkov states in intense laser fields: QED predictions
E. Lötstedt, U. D. Jentschura
In an intense laser field, an electron may decay by emitting a pair of photons. The two photons emitted during the process, which can be interpreted as a laser-dressed double Compt…
Nonperturbative treatment of double Compton backscattering in intense laser fields
E. Lötstedt, U. D. Jentschura
The emission of a pair of entangled photons by an electron in an intense laser field can be described by two-photon transitions of laser-dressed, relativistic Dirac--Volkov states.…
Photoionization Broadening of the 1S-2S Transition in a Beam of Atomic Hydrogen
N. Kolachevsky, M. Haas, U. D. Jentschura +7
We consider the excitation dynamics of the two-photon \sts transition in a beam of atomic hydrogen by 243 nm laser radiation. Specifically, we study the impact of ionization dampin…
Bethe Logarithms for Rydberg States: Numerical Values for n <= 200
Ulrich D. Jentschura, Peter J. Mohr
This document provides reference data for all Bethe logarithms of hydrogenic bound states with principal quantum numbers n <= 200.
Calculation of Hydrogenic Bethe Logarithms for Rydberg States
Ulrich D. Jentschura, Peter J. Mohr
We describe the calculation of hydrogenic (one-loop) Bethe logarithms for all states with principal quantum numbers n <= 200. While, in principle, the calculation of the Bethe loga…
Multi-Instantons and Exact Results II: Specific Cases, Higher-Order Effects, and Numerical Calculations
Jean Zinn-Justin, Ulrich D. Jentschura
In this second part of the treatment of instantons in quantum mechanics, the focus is on specific calculations related to a number of quantum mechanical potentials with degenerate…
Multi-Instantons and Exact Results I: Conjectures, WKB Expansions, and Instanton Interactions
Jean Zinn-Justin, Ulrich D. Jentschura
We consider specific quantum mechanical model problems for which perturbation theory fails to explain physical properties like the eigenvalue spectrum even qualitatively, even if t…
Radiative Corrections to Multi-Level Mollow-Type Spectra
Ulrich D. Jentschura, Joerg Evers, Christoph H. Keitel
This paper is concerned with two rather basic phenomena: the incoherent fluorescence spectrum of an atom driven by an intense laser field and the coupling of the atom to the (empty…
Toward high-precision values of the self energy of non-S states in hydrogen and hydrogen-like ions
Eric-Olivier Le Bigot, Ulrich D. Jentschura, Paul Indelicato +1
The method and status of a study to provide numerical, high-precision values of the self-energy level shift in hydrogen and hydrogen-like ions is described. Graphs of the self ener…
Relativistic and Radiative Corrections to the Mollow Spectrum
Joerg Evers, Ulrich D. Jentschura, Christoph H. Keitel
The incoherent, inelastic part of the resonance fluorescence spectrum of a laser-driven atom is known as the Mollow spectrum [B. R. Mollow, Phys. Rev. 188, 1969 (1969)]. Starting f…
Lamb Shift of Laser-Dressed Atomic States
U. D. Jentschura, J. Evers, M. Haas +1
We discuss radiative corrections to an atomic two-level system subject to an intense driving laser field. It is shown that the Lamb shift of the laser-dressed states, which are the…