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Zheltikov AM. Thermal and Quantum Barrier Passage as Potential-Driven Markovian Dynamics. J Phys Chem B 2023; 127:9413-9422. [PMID: 37905974 PMCID: PMC10863070 DOI: 10.1021/acs.jpcb.3c02744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 09/08/2023] [Indexed: 11/02/2023]
Abstract
Rapidly progressing laser technologies provide powerful tools to study potential barrier-passage dynamics in physical, chemical, and biological systems with unprecedented temporal and spatial resolution and a remarkable chemical and structural specificity. The available theories of barrier passage, however, operate with equations, potentials, and parameters that are best suited for a specific area of research and a specific class of systems and processes. Making connections among these theories is often anything but easy. Here, we address this problem by presenting a unified framework for the description of a vast variety of classical and quantum barrier-passage phenomena, revealing an innate connection between various types of barrier-passage dynamics and providing closed-form equations showing how the signature exponentials in classical and quantum barrier-passage rates relate to and translate into each other. In this framework, the Arrhenius-law kinetics, the emergence of the Gibbs distribution, Hund's molecular wave-packet well-to-well oscillatory dynamics, Keldysh photoionization, and Kramers' escape over a potential barrier are all understood as manifestations of a potential-driven Markovian dynamics whereby a system evolves from a state of local stability. Key to the irreducibility of quantum tunneling to thermally activated barrier passage is the difference in the ways the diffusion-driving potentials emerge in these two tunneling settings, giving rise to stationary states with a distinctly different structure.
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Affiliation(s)
- A. M. Zheltikov
- Institute for Quantum Science and Engineering,
Department of Physics and Astronomy, Texas
A&M University, College Station, Texas 77843, United States
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Brée C, Hofmann M, Demircan A, Morgner U, Kosareva O, Savel'ev A, Husakou A, Ivanov M, Babushkin I. Symmetry Breaking and Strong Persistent Plasma Currents via Resonant Destabilization of Atoms. PHYSICAL REVIEW LETTERS 2017; 119:243202. [PMID: 29286725 DOI: 10.1103/physrevlett.119.243202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Indexed: 06/07/2023]
Abstract
The ionization rate of an atom in a strong optical field can be resonantly enhanced by the presence of long-living atomic levels (so-called Freeman resonances). This process is most prominent in the multiphoton ionization regime, meaning that the ionization event takes many optical cycles. Nevertheless, here, we show that these resonances can lead to rapid subcycle-scale plasma buildup at the resonant values of the intensity in the pump pulse. The fast buildup can break the cycle-to-cycle symmetry of the ionization process, resulting in the generation of persistent macroscopic plasma currents which remain after the end of the pulse. This, in turn, gives rise to a broadband radiation of unusual spectral structure, forming a comb from terahertz to visible. This radiation contains fingerprints of the attosecond electron dynamics in Rydberg states during ionization.
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Affiliation(s)
- C Brée
- Weierstrass Institute, Mohrenstrasse 39, 10117 Berlin, Germany
| | - M Hofmann
- Virtimo AG, Münzstrasse 5, 10178 Berlin, Germany
| | - A Demircan
- Institute for Quantum Optics, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
- Hannover Centre for optical Technologies, Nienburger Strasse 17, 30167 Hannover, Germany
| | - U Morgner
- Institute for Quantum Optics, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
- Hannover Centre for optical Technologies, Nienburger Strasse 17, 30167 Hannover, Germany
| | - O Kosareva
- Physics Faculty, Lomonosov Moscow State University, Leninskie gory 1-62, 119991 Moscow, Russia
| | - A Savel'ev
- Physics Faculty, Lomonosov Moscow State University, Leninskie gory 1-62, 119991 Moscow, Russia
| | - A Husakou
- Max Born Institute, Max Born Strasse 2a, 12489 Berlin, Germany
| | - M Ivanov
- Max Born Institute, Max Born Strasse 2a, 12489 Berlin, Germany
| | - I Babushkin
- Institute for Quantum Optics, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
- Max Born Institute, Max Born Strasse 2a, 12489 Berlin, Germany
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Lanin AA, Fedotov IV, Fedotov AB, Sidorov-Biryukov DA, Zheltikov AM. The phase-controlled Raman effect. Sci Rep 2013; 3:1842. [PMID: 23719358 PMCID: PMC3667572 DOI: 10.1038/srep01842] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 04/23/2013] [Indexed: 11/17/2022] Open
Abstract
Unlike spontaneous Raman effect, nonlinear Raman scattering generates fields with a well-defined phase, allowing Raman signals from individual scatterers to add up into a highly directional, high-brightness coherent beam. Here, we show that the phase of coherent Raman scattering can be accurately controlled and finely tuned by using spectrally and temporally tailored optical driver fields. In our experiments, performed with spectrally optimized phase-tunable laser pulses, such a phase control is visualized through the interference of the coherent Raman signal with the field resulting from nonresonant four-wave mixing. This interference gives rise to Fano-type profiles in the overall nonlinear response measured as a function of the delay time between the laser pulses, featuring a well-resolved destructive-interference dip on the dark side of the Raman peak. This phase-control strategy is shown to radically enhance the coherent response from weak Raman modes, thus helping confront long-standing challenges in nonlinear Raman imaging and microspectroscopy.
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Affiliation(s)
- A. A. Lanin
- International Laser Center, Physics Department M. V. Lomonosov MSU, Moscow, Russia
- Russian Quantum Center, Novaya 100, 143025 Skolkovo, Moscow Region, Russia
| | - I. V. Fedotov
- International Laser Center, Physics Department M. V. Lomonosov MSU, Moscow, Russia
- Russian Quantum Center, Novaya 100, 143025 Skolkovo, Moscow Region, Russia
| | - A. B. Fedotov
- International Laser Center, Physics Department M. V. Lomonosov MSU, Moscow, Russia
- Russian Quantum Center, Novaya 100, 143025 Skolkovo, Moscow Region, Russia
| | - D. A. Sidorov-Biryukov
- International Laser Center, Physics Department M. V. Lomonosov MSU, Moscow, Russia
- Russian Quantum Center, Novaya 100, 143025 Skolkovo, Moscow Region, Russia
| | - A. M. Zheltikov
- International Laser Center, Physics Department M. V. Lomonosov MSU, Moscow, Russia
- Russian Quantum Center, Novaya 100, 143025 Skolkovo, Moscow Region, Russia
- Department of Physics and Astronomy, Texas A&M University, College Station TX, 77843-4242 USA
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