Hot carrier and hot phonon coupling during ultrafast relaxation of photoexcited electrons in graphene

  title={Hot carrier and hot phonon coupling during ultrafast relaxation of photoexcited electrons in graphene},
  author={Jos{\'e} M. Iglesias and Mar'ia J. Mart'in and Elena Pascual and Ra{\'u}l Rengel},
  journal={arXiv: Mesoscale and Nanoscale Physics},
We study, by means of a Monte Carlo simulator, the hot phonon effect on the relaxation dynamics in photoexcited graphene and its quantitative impact as compared to considering an equilibrium phonon distribution. Our multi-particle approach indicates that neglecting the hot phonon effect significantly underestimates the relaxation times in photoexcited graphene. The hot phonon effect is more important for a higher energy of the excitation pulse and photocarrier densities between $1$ and $3\times… 
22 Citations

Figures from this paper

Interplay of out-of-equilibrium phonons and self-heating under high field transport conditions in graphene
The interaction between out-of-equilibrium phonons and Joule heating in the static electron transport properties of monolayer graphene supported on is investigated. An ensemble Monte Carlo electronic
Indirect electron-phonon interaction leading to significant reduction of thermal conductivity in graphene
Abstract We investigate the effect of electron-phonon interaction (EPI) on the lattice thermal conductivity κ ph of graphene from first-principles calculations. By employing an iterative solution of
Relevance of collinear processes to the ultrafast dynamics of photoexcited carriers in graphene
Abstract The importance of interband transitions on the ultrafast relaxation process in photoexcited pristine graphene is evaluated by means of an ensemble Monte Carlo simulator. Impact ionization
Substrate influence on the early relaxation stages of photoexcited carriers in monolayer graphene
Abstract The influence of different substrates on the photocarrier relaxation dynamics in monolayer graphene during the early stages of thermalization and cooling is explored and analyzed by means of
Influence of temperature on the displacement threshold energy in graphene
This work shows using density functional tight-binding simulations that the displacement threshold energy is affected by thermal perturbations of atoms from their equilibrium positions and replaces the constant threshold energy value with a distribution.
Optical pumping in graphene-based terahertz/far-infrared superluminescent and laser heterostructures with graded-gap black-PxAs1−x absorbing-cooling layers
Abstract. We analyze the pumping of the graphene-based laser heterostructures by infrared radiation using the numerical model. To enable the injection of sufficiently cooled carriers into the
Theoretical analysis of injection driven thermal light emitters based on graphene encapsulated by hexagonal boron nitride
We develop the device model for the proposed injection (electrically) driven thermal light emitters (IDLEs) based on the vertical Hexagonal Boron Nitride Layer/Graphene Layer/ Hexagonal Boron Nitride
Negative terahertz conductivity and amplification of surface plasmons in graphene–black phosphorus injection laser heterostructures
We propose and evaluate the heterostructure based on the graphene-layer (GL) with the lateral electron injection from the side contacts and the hole vertical injection via the black phosphorus layer
Monte Carlo studies of thermalization of electron–hole pairs in spin-polarized degenerate electron gas in monolayer graphene
Monte Carlo method is applied to the study of relaxation of excited electron–hole (e–h) pairs in graphene. The presence of background of spin-polarized electrons, with high density imposing
Optical pumping through a black-As absorbing-cooling layer in graphene-based heterostructure: thermo-diffusion model
We study the optical near- and mid-infrared pumping of the heterostructure based on graphene with a black-As layer. This layer serves for the optical generation and cooling of the electron-hole pairs


Ultrafast relaxation dynamics of hot optical phonons in graphene
Using ultrafast optical pump-probe spectroscopy, we study the relaxation dynamics of hot optical phonons in few-layer and multilayer graphene films grown by epitaxy on silicon carbide substrates and
Ultrafast dynamics of hot electrons and phonons in chemical vapor deposited graphene
The relaxation dynamics of photoexcited carriers in a chemical vapor deposited graphene transferred on quartz substrate has been investigated by using ultrafast optical-pump terahertz (THz)-probe
Hot carriers relaxation in highly excited polar semiconductors: Hot phonons versus phonon-plasmon coupling
We present a study of the photo-excited charge carriers relaxation dynamics in polar semiconductors comparing calculations to pump probe experiments. Hot carrier densities in the 1018cm-3 range can
Ultrafast relaxation of hot optical phonons in monolayer and multilayer graphene on different substrates
Abstract Hot carrier cooling in few-layer and multilayer epitaxial graphene on SiC, and chemical vapor deposition (CVD) grown graphene transferred onto a glass substrate was investigated by transient
Cooling of photoexcited carriers in graphene by internal and substrate phonons
We investigate the energy relaxation of hot carriers produced by photoexcitation of graphene through coupling to both intrinsic and remote (substrate) surface polar phonons using the Boltzmann
The impact of pump fluence on carrier relaxation dynamics in optically excited graphene.
  • T. Winzer, E. Malic
  • Materials Science, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2013
Light is shed on the influence of the pump fluence on the temporal evolution of carrier and phonon occupations as well as on the many-particle dephasing of the microscopic polarization to contribute to a better understanding of the ultrafast carrier dynamics in graphene.
Ultrafast carrier relaxation and vertical-transport phenomena in semiconductor superlattices: A Monte Carlo analysis.
The dominant role of carrier\char21{}polar-optical-phonon interaction is shown in determining the nature of the carrier dynamics in the low-density limit, and the miniband width turns out to be a relevant quantity in predicting the existence of Bloch oscillations.
Carrier-carrier and carrier-phonon interactions in the dynamics of photoexcited electrons in graphene
In this work we use the Monte Carlo method to simulate the photoexcited carrier relaxation dynamics in suspended monolayer graphene to unveil the role of the different scattering mechanisms involved.
High-field transport in two-dimensional graphene
Transport of carriers in two-dimensional graphene at high electric fields is investigated by combining semianalytical and Monte Carlo methods. A semianalytical high-field transport model based on the
Acoustic phonon lifetimes and thermal transport in free-standing and strained graphene.
It is shown that using a standard perturbative approach, the transverse and longitudinal acoustic phonons in free-standing graphene display finite lifetimes in the long-wavelength limit, making them ill-defined as elementary excitations in samples of dimensions larger than ∼1 μm.