Results 91 to 100 of about 36,165 (249)

A Variational Approach to Bound States in Quantum Field Theory

, 1993
We consider here in a toy model an approach to bound state problem in a nonperturbative manner using equal time algebra for the interacting field operators.
A. Mishra, A. Mishra, A. Mishra, A. Mishra, D. Schutte, D.B. Lichtenberg, H. Inazawa, H. Mishra, H. Mishra, H. Mishra, P.M. Stevenson, P.M. Stevenson, S. P. Misra, S.P. Misra, S.P. Misra, S.P. Misra   +15 more
core   +2 more sources

Electron-electron interaction effects in quantum point contacts [PDF]

, 2009
We consider electron-electron interaction effects in quantum point contacts on the first quantization plateau, taking into account all scattering processes.
De Martino, A., Egger, R., Flensberg, K., Lunde, A. M., Schulz, A.   +4 more
core   +2 more sources

Axion‐Like Interactions and CFT in Topological Matter, Anomaly Sum Rules and the Faraday Effect

Advanced Physics Research, Volume 4, Issue 7, July 2025.
This review investigates the connection between chiral anomalies and their manifestation in topological materials, using both perturbative methods based on ordinary quantum field theory and conformal field theory (CFT). It emphasizes the role of CFT in momentum space for parity‐odd correlation functions, and their reconstruction by the inclusion of a ...
Claudio Corianò, Mario Cretì, Stefano Lionetti, Dario Melle, Riccardo Tommasi   +4 more
wiley   +1 more source

Problem of Nonlinear Conductivity within Relaxation Time Approximation in Noncentrosymmetric Insulators

physica status solidi (b), Volume 262, Issue 7, July 2025.
It is demonstrated that the relaxation time approximation (RTA) for the quantum kinetic equation, a simple method for describing nonequilibrium steady states, has a critical flaw in the longitudinal nonlinear DC conductivity of insulators under weak electric fields.
Ibuki Terada, Sota Kitamura, Hiroshi Watanabe, Hiroaki Ikeda   +3 more
wiley   +1 more source

Emergent Gauge Fields and Their Nonperturbative Effects in Correlated Electrons [PDF]

Modern Physics Letters B, 2015
The history of modern condensed matter physics may be regarded as the competition and reconciliation between Stoner’s and Anderson’s physical pictures, where the former is based on momentum–space descriptions focusing on long wave-length fluctuations while the latter is based on real-space physics emphasizing emergent localized excitations.
Kim, KS, Akihiro Tanaka
openaire   +6 more sources

Structure of hyperbolic polynomial automorphisms of C2${\mathbb {C}^2}$ with disconnected Julia sets

Proceedings of the London Mathematical Society, Volume 130, Issue 6, June 2025.
Abstract For a hyperbolic polynomial automorphism of C2$\mathbb {C}^2$ with a disconnected Julia set, and under a mild dissipativity condition, we give a topological description of the components of the Julia set. Namely, there are finitely many “quasi‐solenoids” that govern the asymptotic behavior of the orbits of all nontrivial components.
Romain Dujardin, Mikhail Lyubich
wiley   +1 more source

Effective gravitational couplings of Kaluza-Klein gauge theories

Journal of High Energy Physics, 2023
We study the effective gravitational couplings of four-dimensional gauge theories with eight supercharges. The class of theories we analyse are arrived at via Kaluza-Klein compactification of five-dimensional gauge theories.
Sujay K. Ashok, Renjan Rajan John, T. J. Layon, Sujoy Mahato, Madhusudhan Raman   +4 more
doaj   +1 more source

Nonperturbative Zou-Wang-Mandel effect

Physical Review A
The Zou-Wang-Mandel (ZWM) effect is a remarkable consequence of photon indistinguishability and continuous-variable entanglement in which an optical phase shift is imprinted on photonic modes associated with optical paths that that do not pass through the phase shift source.
T. J. Volkoff, Diego A. R. Dalvit
openaire   +2 more sources

Computation of Time‐Resolved Nonlinear Electronic Spectra From Classical Trajectories

WIREs Computational Molecular Science, Volume 15, Issue 3, May/June 2025.
Stimulated emission contribution to the two‐dimensional electronic spectrum of pyrazine at a waiting time of 60 fs as a function of the excitation and emission frequencies. ABSTRACT A variety of time‐resolved spectroscopic techniques employing femtosecond pump and probe pulses are nowadays widely used to unravel the fundamental mechanisms of ...
Maxim F. Gelin, Zhenggang Lan, Nađa Došlić, Wolfgang Domcke   +3 more
wiley   +1 more source

Non-perturbative effects in μ → eγ

Journal of High Energy Physics, 2019
We compute the non-perturbative contribution of semileptonic tensor operators q ¯ σ μ ν q ℓ ¯ σ μ ν ℓ $$ \left(\overline{q}{\sigma}^{\mu \nu }q\right)\left(\overline{\ell}{\sigma}_{\mu \nu}\ell \right) $$ to the purely leptonic process μ → eγ and to the ...
Wouter Dekens, Elizabeth E. Jenkins, Aneesh V. Manohar, Peter Stoffer   +3 more
doaj   +1 more source