Gauge-invariant absorption of light from a coherent superposition of states
(2023) In Physical Review A 107(5).- Abstract
Absorption and emission of light is studied theoretically for excited atoms in coherent superposition of states subjected to isolated attosecond pulses in the extreme ultraviolet range. A gauge-invariant formulation of transient absorption theory is motivated using the energy operator from Yang's gauge theory. The interaction, which simultaneously couples both bound and continuum states, is simulated by solving the time-dependent Schrödinger equation for hydrogen and neon atoms. A strong dependence on the angular momentum and the relative phase of the states in the superposition is observed. Perturbation theory is used to disentangle the fundamental absorption processes and a rule is established to interpret the complex absorption... (More)
Absorption and emission of light is studied theoretically for excited atoms in coherent superposition of states subjected to isolated attosecond pulses in the extreme ultraviolet range. A gauge-invariant formulation of transient absorption theory is motivated using the energy operator from Yang's gauge theory. The interaction, which simultaneously couples both bound and continuum states, is simulated by solving the time-dependent Schrödinger equation for hydrogen and neon atoms. A strong dependence on the angular momentum and the relative phase of the states in the superposition is observed. Perturbation theory is used to disentangle the fundamental absorption processes and a rule is established to interpret the complex absorption behavior. It is found that nonresonant transitions are the source of asymmetry in energy and phase, while resonant transitions to the continuum contribute symmetrically to absorption of light from coherent superpositions of states.
(Less)
- author
- Stenquist, Axel LU ; Zapata, Felipe LU and Dahlström, Jan Marcus LU
- organization
- publishing date
- 2023-05
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review A
- volume
- 107
- issue
- 5
- article number
- 053106
- publisher
- American Physical Society
- external identifiers
-
- scopus:85159079821
- ISSN
- 2469-9926
- DOI
- 10.1103/PhysRevA.107.053106
- language
- English
- LU publication?
- yes
- id
- 3e5078a3-a537-41eb-a4c5-65239b9941b2
- date added to LUP
- 2023-08-11 09:23:02
- date last changed
- 2023-08-11 09:23:02
@article{3e5078a3-a537-41eb-a4c5-65239b9941b2,
abstract = {{<p>Absorption and emission of light is studied theoretically for excited atoms in coherent superposition of states subjected to isolated attosecond pulses in the extreme ultraviolet range. A gauge-invariant formulation of transient absorption theory is motivated using the energy operator from Yang's gauge theory. The interaction, which simultaneously couples both bound and continuum states, is simulated by solving the time-dependent Schrödinger equation for hydrogen and neon atoms. A strong dependence on the angular momentum and the relative phase of the states in the superposition is observed. Perturbation theory is used to disentangle the fundamental absorption processes and a rule is established to interpret the complex absorption behavior. It is found that nonresonant transitions are the source of asymmetry in energy and phase, while resonant transitions to the continuum contribute symmetrically to absorption of light from coherent superpositions of states.</p>}},
author = {{Stenquist, Axel and Zapata, Felipe and Dahlström, Jan Marcus}},
issn = {{2469-9926}},
language = {{eng}},
number = {{5}},
publisher = {{American Physical Society}},
series = {{Physical Review A}},
title = {{Gauge-invariant absorption of light from a coherent superposition of states}},
url = {{http://dx.doi.org/10.1103/PhysRevA.107.053106}},
doi = {{10.1103/PhysRevA.107.053106}},
volume = {{107}},
year = {{2023}},
}