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          Institute: MPI für Kernphysik     Collection: Theoretical Quantum Dynamics     Display Documents



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ID: 284811.0, MPI für Kernphysik / Theoretical Quantum Dynamics
Gauge-invariant relativistic strong-field approximation
Authors:Klaiber, Michael; Hatsagortsyan, Karen Zaven; Keitel, Christoph Helmut
Language:English
Date of Publication (YYYY-MM-DD):2006-05-31
Title of Journal:Physical Review A
Journal Abbrev.:Phys. Rev. A
Volume:73
Sequence Number of Article:053411
Copyright:©2006 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The problem of the choice of gauge in the relativistic strong-field approximation (SFA) is analyzed. The main motivation is to obtain a relativistic ionization amplitude in the SFA which in the nonrelativistic limit coincides with the conventional well-accepted results of the SFA in the length gauge. A gauge-invariant formulation of the SFA is derived which is applicable both in the nonrelativistic as well as in the relativistic regime of laser-induced strong-field ionization phenomena. The gauge invariance is achieved by means of employment of an eigenstate of the physical energy operator for the initial atomic state. As an example, a comparison of predictions of the gauge-invariant theory with conventional SFA results in the radiation gauge is given for above-threshold ionization in the relativistic regime.
External Publication Status:published
Document Type:Article
Communicated by:C.H. Keitel
Affiliations:MPI für Kernphysik/ Group C.H. Keitel/Relativistic Quantum Dynamics and High-Energy Processes (K. Hatsagortsyan)
External Affiliations:Theoretische Quantendynamik, Physikalisches Institut der Albert-Ludwigs-Universität, Hermann-Herder-Straße 3, D-79104, Freiburg, Germany
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