Vanishing Electronic Energy Loss of Very Slow Light Ions in Insulators with Large Band Gaps

Markin, S.N.; Primetzhofer, Daniel; Bauer, Péter

doi:10.1103/physrevlett.103.113201

Cited by 93 publications

(78 citation statements)

References 21 publications

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“…The energy deposition of slow ions in solids may depend on details of the ion trajectory and threshold conditions are currently being investigated [1]. On the contrary, the local energy deposition of fast ions is relatively well understood and different theoretical concepts yield results that agree roughly with experiment and with each other [2,3].…”

supporting

confidence: 55%

“…These differences are related to changes in the local electronic band structure of BeO on a femtosecond time scale after the passage of highly charged heavy ions. DOI: 10.1103/PhysRevLett.105.187603 PACS numbers: 79.20.Rf, 31.70.Hq, 32.80.Hd, 71.20.Ps The energy deposition of slow ions in solids may depend on details of the ion trajectory and threshold conditions are currently being investigated [1]. On the contrary, the local energy deposition of fast ions is relatively well understood and different theoretical concepts yield results that agree roughly with experiment and with each other [2,3].…”

mentioning

confidence: 99%

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Evidence for an Ultrafast Breakdown of the BeO Band Structure Due to Swift Argon and Xenon Ions

et al. 2010

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Auger-electron spectra associated with Be atoms in the pure metal lattice and in the stoichiometric oxide have been investigated for different incident charged particles. For fast incident electrons, for Ar 7þ and Ar 15þ ions as well as Xe 15þ and Xe 31þ ions at velocities of 6% to 10% the speed of light, there are strong differences in the corresponding spectral distributions of Be-K Auger lines. These differences are related to changes in the local electronic band structure of BeO on a femtosecond time scale after the passage of highly charged heavy ions. DOI: 10.1103/PhysRevLett.105.187603 PACS numbers: 79.20.Rf, 31.70.Hq, 32.80.Hd, 71.20.Ps The energy deposition of slow ions in solids may depend on details of the ion trajectory and threshold conditions are currently being investigated [1]. On the contrary, the local energy deposition of fast ions is relatively well understood and different theoretical concepts yield results that agree roughly with experiment and with each other [2,3]. The electronic energy dissipation and relaxation, however, is subject to intense investigations and especially effects of the high-energy density due to focused short lasers pulses [4] or individual swift heavy ions may give rise to unexpected results [5]. There have been speculations about a collective Coulomb explosion [6], a repulsive interaction among multiply ionized target atoms, and in fact evidence for this effect has been found for laser [4] and ion-beam interactions in some specific insulators [7]. For most materials, however, the corresponding nuclear-track potentials and fields are too low or do not last long enough to initiate materials modifications. Under these conditions, perturbative mechanisms such as the site-specific Auger-induced ionic desorption [8] or collective mechanisms driven by high kinetic electron energies may gain importance. For the latter case, either lattice instabilities [9] or electronic thermal-spike effects [10,11] may play a major role, where hot electrons at electron temperatures of nearly 100 000 K [12,13] transfer their energy to the lattice.Usually, the energy distribution dnðT e ; "Þ=d" of thermally equilibrated hot electrons is given by the product of total (occupied plus unoccupied) electronic density-ofstates (EDOS) Dð"Þ and the Fermi-Dirac distribution. The resulting Auger spectrum is given by the convolution of two of such densities, dn X =d" and dn Y =d" for all combinations of bands X and Y, weighted by the squared Auger matrix elements. It will be shown here, however, that Auger spectra for BeO are inconsistent with this simple factorization of dn=d".

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confidence: 99%

Evidence for an Ultrafast Breakdown of the BeO Band Structure Due to Swift Argon and Xenon Ions

et al. 2010

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“…Pruneda et al [138] examined the case of protons and anti-protons penetrating the insulator lithium fluoride. Experimental data for the electronic stopping power of LiF for various penetrating particles suggests the existence of a threshold effect [139,140,141]. Below a certain velocity (0.1 v 0 for protons in LiF) the electronic stopping power drops nearly to zero, violating the standard dE/dx ∝ v behaviour.…”

Section: Time-dependent Density Functional Theorymentioning

confidence: 99%

The treatment of electronic excitations in atomistic models of radiation damage in metals

Race¹,

Mason²,

Finnis³

et al. 2010

Rep. Prog. Phys.

135

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Abstract. Atomistic simulations are a primary means of understanding the damage done to metallic materials by high energy particulate radiation. In many situations the electrons in a target material are known to exert a strong influence on the rate and type of damage. The dynamic exchange of energy between electrons and ions can act to damp the ionic motion, to inhibit the production of defects or to quench in damage, depending on the situation. Finding ways to incorporate these electronic effects into atomistic simulations of radiation damage is a topic of current major interest, driven by materials science challenges in diverse areas such as energy production and device manufacture.In this review, we discuss the range of approaches that have been used to tackle these challenges. We compare augmented classical models of various kinds and consider recent work applying semi-classical techniques to allow the explicit incorporation of quantum mechanical electrons within atomistic simulations of radiation damage. We also outline the body of theoretical work on stopping power and electron-phonon coupling used to inform efforts to incorporate electronic effects in atomistic simulations and to evaluate their performance.

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“…For large band gap insulators, electronic stopping was found to vanish below a threshold velocity vth -e.g., for LiF (band gap Eg,LiF  13.6 eV) at velocities lower than vth  0.1 a.u. [14,15]. Note that vth for LiF is considerably lower than the kink velocity for Au (vk  0.2 a.u.…”

mentioning

confidence: 99%

“… v  0.64 a.u. (500 eV -10 keV protons) and relate these results to those obtained for SiO2 [14] and Al2O3 [21]. In this context, VO2 is a key material to investigate the influence of Eg on Se, due to the insulator-to-metal transition at a critical temperature TC ≈ 67 °C [25,26].…”

mentioning

confidence: 99%

Electronic Stopping of Slow Protons in Oxides: Scaling Properties

et al. 2017

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Electronic stopping of slow protons in ZnO, VO2 (metal and semiconductor phases), HfO2 and Ta2O5 was investigated experimentally. As a comparison of the resulting stopping cross sections (SCS) to data for Al2O3 and SiO2 reveals, electronic stopping of slow protons does not correlate with electronic properties of the specific material such as band gap energies.Instead, the oxygen 2p states are decisive, as corroborated by DFT calculations of the electronic densities of states. Hence, at low ion velocities the SCS of an oxide primarily scales with its oxygen density.

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Vanishing Electronic Energy Loss of Very Slow Light Ions in Insulators with Large Band Gaps

Cited by 93 publications

References 21 publications

Evidence for an Ultrafast Breakdown of the BeO Band Structure Due to Swift Argon and Xenon Ions

Evidence for an Ultrafast Breakdown of the BeO Band Structure Due to Swift Argon and Xenon Ions

The treatment of electronic excitations in atomistic models of radiation damage in metals

Electronic Stopping of Slow Protons in Oxides: Scaling Properties

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