Electron-Ion Equilibration in Ultrafast Heated Graphite

White, T. G.; Hartley, N. J.; Borm, B.; Crowley, B.J.B.; Harris, Julie A.; Hochhaus, D. C.; Kaempfer, T. U.; Li, K.; Neumayer, P.; Pattison, L. K.; Pfeifer, F.; Richardson, S. W.; Robinson, A. P. L.; Uschmann, I.; Gregori, G.

doi:10.1103/physrevlett.112.145005

Cited by 52 publications

(38 citation statements)

References 43 publications

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“…While experiments near equilibrium [9] show good agreement with standard theoretical predictions [11], other experiments with high excitation densities or a more complex material structure have demonstrated large deviations with relaxation times longer than predicted [10,13]. Such deviations are typical for strongly heated, fluid systems [14][15][16][17][18] where the energy transfer does not evolve through electron-phonon coupling but through direct two-particle scattering or ion acoustic * thomas.white@imperial.ac.uk modes. Although theoretical models considering the collective behavior of these coupled system show similar effects [19][20][21], the predictions do not agree with the small amount of experimental data available.…”

Section: Introductionmentioning

confidence: 75%

Electron-phonon equilibration in laser-heated gold films

et al. 2014

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By irradiating a thin metal foil with an intense short-pulse laser, we have created a uniform system far from equilibrium. The deposited energy is initially deposited only within the electronic subsystem, and the subsequent evolution of the system is determined by the details of the electron-phonon coupling. Here, we measure the time evolution of the lattice parameter through multilayer Bragg diffraction and compare the result to classical molecular dynamic simulations to determine the lattice temperature. The electron-ion coupling constant for gold is then determined by comparison with the evolution of a two-temperature electron-phonon system.

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Section: Introductionmentioning

confidence: 75%

Electron-phonon equilibration in laser-heated gold films

et al. 2014

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“…These characteristics were nicely described by a TTM scheme, in which the Dirac fermions are weakly coupled into some optical phonons. Our study provides a starting point to understand the ultrafast dynamics under stronger couplings and excitations: The strong couplings may result in the breakdown of the TTM scheme [26-28, 55, 56] or the band structures [14,31,57] and concepts of quasi-particles may have to be seriously taken into account [30,33]; A warm-dense matter will be reached at stronger excitations [58][59][60]. A variety of pump-and-probe methodologies are needed to deepen insights into the strongly-correlated ultrafast phenomena.…”

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confidence: 99%

Revealing the ultrafast light-to-matter energy conversion before heat diffusion in a layered Dirac semimetal

et al. 2016

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There is still no general consensus on how one can describe the out-of-equilibrium phenomena in matter induced by an ultrashort light pulse. We investigate the pulse-induced dynamics in a layered Dirac semimetal SrMnBi2 by pump-and-probe photoemission spectroscopy. At 1 ps, the electronic recovery slowed upon increasing the pump power. Such a bottleneck-type slowing is expected in a two-temperature model (TTM) scheme, although opposite trends have been observed to date in graphite and in cuprates. Subsequently, an unconventional power-law cooling took place at ∼100 ps, indicating that spatial heat diffusion is still ill defined at ∼100 ps. We identify that the successive dynamics before the emergence of heat diffusion is a canonical realization of a TTM scheme. Criteria for the applicability of the scheme is also provided.

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“…In many cases of high energy density physics researches, the temperature of the target may reach 1-100 eV while still maintaining the near-solid density, the original cold target becomes warm dense matter (WDM) [1][2][3]. Until now, however, the properties of WDM are not well understood.…”

Section: Introductionmentioning

confidence: 99%

“…Energetic, i.e., MeV, ion-beam-solid interactions provide a much more efficient heating mechanism, i.e., isochoric heating, which is usually of deep (100s µm) and localized energy depositions [12]. Thus, understanding the energetic ion beam dynamics in the matter is of importance for the wide range of potential applications, such as medicine physics including tumour therapy [13], creation of the WDM [1][2][3], and the ion fast ignition concept of inertial confinement fusion [10].…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo approach to calculate proton stopping in warm dense matter within particle-in-cell simulations

et al. 2017

Phys. Rev. E

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A Monte-Carlo approach to proton stopping in warm dense matter is implemented into an existing particle-in-cell code. The model is based on multiple binary-collisions among electron-electron, electron-ion and ion-ion, taking into account contributions from both free and bound electrons, and allows to calculate particle stopping in much more natural manner. At low temperature limit, when "all" electron are bounded at the nucleus, the stopping power converges to the predictions of BetheBloch theory, which shows good consistency with data provided by the NIST. With the rising of temperatures, more and more bound electron are ionized, thus giving rise to an increased stopping power to cold matter, which is consistent with the report of a recently experimental measurement [Phys. Rev. Lett. 114, 215002 (2015)]. When temperature is further increased, with ionizations reaching the maximum, lowered stopping power is observed, which is due to the suppression of collision frequency between projected proton beam and hot plasmas in the target.

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Electron-Ion Equilibration in Ultrafast Heated Graphite

Cited by 52 publications

References 43 publications

Electron-phonon equilibration in laser-heated gold films

Electron-phonon equilibration in laser-heated gold films

Revealing the ultrafast light-to-matter energy conversion before heat diffusion in a layered Dirac semimetal

Monte Carlo approach to calculate proton stopping in warm dense matter within particle-in-cell simulations

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