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Electron-Phonon Coupling of Metals
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Electron-Phonon Coupling of Metals

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Electronic Materials".

Deadline for manuscript submissions: closed (20 June 2022) | Viewed by 6665

Special Issue Editor

Dr. Nikita Medvedev

E-Mail Website
Guest Editor
Institute of Physics and Institute of Plasma Physics, Academy of Science of Czech Republic, Na Slovance 1999/2, 18221 Prague 8, Czech Republic
Interests: radiation effects in matter; nonequilibrium kinetics; electron–ion coupling; nonthermal melting

Special Issue Information

Dear Colleagues,

The field of two-temperature state of matter has attracted physicists’ attention since the early 1960s, with the advent of first powerful lasers. Upon high-energy-density deposition, matter enters a transient state with highly excited electrons and relatively cold and unaffected atoms/ions. Many practical applications of irradiation of materials demand a detailed understanding of the fundamental processes taking place. To this date, there are many unknown aspects of states of matter produced under irradiation. In particular, electron–phonon (electron–ion) coupling is one of the most important parameters governing material evolution after ultrafast energy deposition, which remains the most unexplored. Various theories, developed in different fields, often predict noticeably different coupling. It is also difficult to measure it reliably in experiments at significantly elevated electronic temperatures.

This Special Issue focuses on the current state of knowledge in the field of electron–phonon coupling in metals. It may include experimental as well as theoretical papers, describing all aspects of the electron–ion coupling process in metals and comparisons with nonmetallic materials.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Dr. Nikita Medvedev
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Electron–phonon coupling
  • Electron–ion coupling
  • Two-temperature model
  • Laser–matter interaction
  • Material irradiation
  • Nonequilibrium kinetics
  • Radiation effects

Published Papers (3 papers)

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Research

12 pages, 3210 KiB  
Article
Effect of Atomic-Temperature Dependence of the Electron–Phonon Coupling in Two-Temperature Model
by Fedor Akhmetov, Nikita Medvedev, Igor Makhotkin, Marcelo Ackermann and Igor Milov
Materials 2022, 15(15), 5193; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15155193 - 26 Jul 2022
Cited by 8 | Viewed by 1793
Abstract
Ultrafast laser irradiation of metals can often be described theoretically with the two-temperature model. The energy exchange between the excited electronic system and the atomic one is governed by the electron–phonon coupling parameter. The electron–phonon coupling depends on both, the electronic and the [...] Read more.
Ultrafast laser irradiation of metals can often be described theoretically with the two-temperature model. The energy exchange between the excited electronic system and the atomic one is governed by the electron–phonon coupling parameter. The electron–phonon coupling depends on both, the electronic and the atomic temperature. We analyze the effect of the dependence of the electron–phonon coupling parameter on the atomic temperature in ruthenium, gold, and palladium. It is shown that the dependence on the atomic temperature induces nonlinear behavior, in which a higher initial electronic temperature leads to faster electron–phonon equilibration. Analysis of the experimental measurements of the transient thermoreflectance of the laser-irradiated ruthenium thin film allows us to draw some, albeit indirect, conclusions about the limits of the applicability of the different coupling parametrizations. Full article
(This article belongs to the Special Issue Electron-Phonon Coupling of Metals)
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11 pages, 2648 KiB  
Article
Electron–Phonon Coupling and Nonthermal Effects in Gold Nano-Objects at High Electronic Temperatures
by Nikita Medvedev and Igor Milov
Materials 2022, 15(14), 4883; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15144883 - 13 Jul 2022
Cited by 5 | Viewed by 1346
Abstract
Laser irradiation of metals is widely used in research and applications. In this work, we study how the material geometry affects electron–phonon coupling in nano-sized gold samples: an ultrathin layer, nano-rod, and two types of gold nanoparticles (cubic and octahedral). We use the [...] Read more.
Laser irradiation of metals is widely used in research and applications. In this work, we study how the material geometry affects electron–phonon coupling in nano-sized gold samples: an ultrathin layer, nano-rod, and two types of gold nanoparticles (cubic and octahedral). We use the combined tight-binding molecular dynamics Boltzmann collision integral method implemented within XTANT-3 code to evaluate the coupling parameter in irradiation targets at high electronic temperatures (up to Te~20,000 K). Our results show that the electron–phonon coupling in all objects with the same fcc atomic structure (bulk, layer, rod, cubic and octahedral nanoparticles) is nearly identical at electronic temperatures above Te~7000 K, independently of geometry and dimensionality. At low electronic temperatures, reducing dimensionality reduces the coupling parameter. Additionally, nano-objects under ultrafast energy deposition experience nonthermal damage due to expansion caused by electronic pressure, in contrast to bulk metal. Nano-object ultrafast expansion leads to the ablation/emission of atoms and disorders the inside of the remaining parts. These nonthermal atomic expansion and melting are significantly faster than electron–phonon coupling, forming a dominant effect in nano-sized gold. Full article
(This article belongs to the Special Issue Electron-Phonon Coupling of Metals)
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14 pages, 726 KiB  
Article
Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals
by Jia Zhang, Rui Qin, Wenjun Zhu and Jan Vorberger
Materials 2022, 15(5), 1902; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15051902 - 03 Mar 2022
Cited by 8 | Viewed by 2465
Abstract
The rate of energy transfer between electrons and phonons is investigated by a first-principles framework for electron temperatures up to Te = 50,000 K while considering the lattice at ground state. Two typical but differently complex metals are investigated: aluminum and copper. [...] Read more.
The rate of energy transfer between electrons and phonons is investigated by a first-principles framework for electron temperatures up to Te = 50,000 K while considering the lattice at ground state. Two typical but differently complex metals are investigated: aluminum and copper. In order to reasonably take the electronic excitation effect into account, we adopt finite temperature density functional theory and linear response to determine the electron temperature-dependent Eliashberg function and electron density of states. Of the three branch-dependent electron–phonon coupling strengths, the longitudinal acoustic mode plays a dominant role in the electron–phonon coupling for aluminum for all temperatures considered here, but for copper it only dominates above an electron temperature of Te = 40,000 K. The second moment of the Eliashberg function and the electron phonon coupling constant at room temperature Te=315 K show good agreement with other results. For increasing electron temperatures, we show the limits of the T=0 approximation for the Eliashberg function. Our present work provides a rich perspective on the phonon dynamics and this will help to improve insight into the underlying mechanism of energy flow in ultra-fast laser–metal interaction. Full article
(This article belongs to the Special Issue Electron-Phonon Coupling of Metals)
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