31 research outputs found
Modeling angle-resolved photoemission of graphene and black phosphorus nano structures
Angle-resolved photoemission spectroscopy (ARPES) data on electronic structure are difficult to interpret, because various factors such as atomic structure and experimental setup influence the quantum mechanical effects during the measurement. Therefore, we simulated ARPES of nano-sized molecules to corroborate the interpretation of experimental results. Applying the independent atomic-center approximation, we used density functional theory calculations and custom-made simulation code to compute photoelectron intensity in given experimental setups for every atomic orbital in poly-aromatic hydrocarbons of various size, and in a molecule of black phosphorus. The simulation results were validated by comparing them to experimental ARPES for highly-oriented pyrolytic graphite. This database provides the calculation method and every file used during the work flow.11Ysciescopu
4 electron temperature driven ultrafast electron localization
Valence transitions in strongly correlated electron systems are caused by
orbital hybridization and Coulomb interactions between localized and
delocalized electrons. The transition can be triggered by changes in the
electronic structure and is sensitive to temperature variations, applications
of magnetic fields, and physical or chemical pressure. Launching the transition
by photoelectric fields can directly excite the electronic states and thus
provides an ideal platform to study the correlation among electrons on
ultrafast timescales. The EuNi(SiGe) mixed-valence
metal is an ideal material to investigate the valence transition of the Eu ions
via the amplified orbital hybridization by the photoelectric field on
sub-picosecond timescales. A direct view on the 4 electron occupancy of the
Eu ions is required to understand the microscopic origin of the transition.
Here we probe the 4 electron states of EuNi(SiGe)
at the sub-ps timescale after photoexcitation by X-ray absorption spectroscopy
across the Eu -absorption edge. The observed spectral changes due to the
excitation indicate a population change of total angular momentum multiplet
states = 0, 1, 2, and 3 of Eu, and the Eu = 7/2 multiplet
state caused by an increase in 4 electron temperature that results in a 4
localization process. This electronic temperature increase combined with
fluence-dependent screening accounts for the strongly non-linear effective
valence change. The data allow us to extract a time-dependent determination of
an effective temperature of the 4 shell, which is also of great relevance in
the understanding of metallic systems' properties, such as the ultrafast
demagnetization of ferromagnetic rare-earth intermetallics and their
all-optical magnetization switching.Comment: 19 pages, 9 figure
X-ray Free Electron Laser Studies of Electron and Phonon Dynamics of Graphene Adsorbed on Copper
We report optical pumping and X-ray absorption spectroscopy experiments at
the PAL free electron laser that directly probe the electron dynamics of a
graphene monolayer adsorbed on copper in the femtosecond regime. By analyzing
the results with ab-initio theory we infer that the excitation of graphene is
dominated by indirect excitation from hot electron-hole pairs created in the
copper by the optical laser pulse. However, once the excitation is created in
graphene, its decay follows a similar path as in many previous studies of
graphene adsorbed on semiconductors, i e. rapid excitation of SCOPS (Strongly
Coupled Optical Phonons) and eventual thermalization. It is likely that the
lifetime of the hot electron-hole pairs in copper governs the lifetime of the
electronic excitation of the graphene.Comment: 22 pages, 8 Figures including Supplementary Materia
Direct and real-time observation of hole transport dynamics in anatase TiO2 using X-ray free-electron laser
Carrier dynamics affects photocatalytic systems, but direct and real-time observations in an element-specific and energy-level-specific manner are challenging. In this study, we demonstrate that the dynamics of photo-generated holes in metal oxides can be directly probed by using femtosecond X-ray absorption spectroscopy at an X-ray free-electron laser. We identify the energy level and life time of holes with a long life time (230 pico-seconds) in nano-crystal materials. We also observe that trapped holes show an energy distribution in the bandgap region with a formation time of 0.3 pico-seconds and a decay time of 8.0 pico-seconds at room temperature. We corroborate the dynamics of the electrons by using X-ray absorption spectroscopy at the metal L-edges in a consistent explanation with that of the holes
experimental ARPES data
This file contains experimental ARPES data of HOPG. The emission angles of HOPG were measured with respect to the normal and tilted direction (2, 4, and 6 degree) using 100 eV photon. Also, photon energies varied from 100 eV to 400 eV for the case of the normal direction
Dynamics of Molecular Orientation Observed using Angle Resolved Photoemission Spectroscopy during Deposition of Pentacene on Graphite
A real-time method to observe both the structural and the electronic configuration of an organic molecule during deposition is reported for the model system of pentacene on graphite. Structural phase transition of the thin films as a function of coverage is monitored by using in situ angle resolved photoemission spectroscopy (ARPES) results to observe the change of the electronic configuration at the same time. A photoemission theory that uses independent atomic center approximations is introduced to identify the molecular orientation from the ARPES technique. This study provides a practical insight into interpreting ARPES data regarding dynamic changes of molecular orientation during initial growth of molecules on a well-defined surface.113sciescopu
Dataset of ARPES simulation for graphene and black phosphorus
The dataset of ARPES simulation consist of DFT calculation results using Gaussian 09 and photoelectron intensity calculations using home-made code
Data from: Modeling angle-resolved photoemission of graphene and black phosphorus nano structures
Angle-resolved photoemission spectroscopy (ARPES) data on electronic structure are difficult to interpret, because various factors such as atomic structure and experimental setup influence the quantum mechanical effects during the measurement. Therefore, we simulated ARPES of nano-sized molecules to corroborate the interpretation of experimental results. Applying the independent atomic-center approximation, we used density functional theory calculations and custom-made simulation code to compute photoelectron intensity in given experimental setups for every atomic orbital in poly-aromatic hydrocarbons of various size, and in a molecule of black phosphorus. The simulation results were validated by comparing them to experimental ARPES for highly-oriented pyrolytic graphite. This database provides the calculation method and every file used during the work flow
PES_program
This is stand alone version of photoelectron intensity calculation program. This code can calculate photoelectron intensity for a atomic orbital with independent atomic center approximation
Bis(4-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)dimethylsilane as Electron-Transport Material for Deep Blue Phosphorescent OLEDs
Bis(4-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)dimethylsilane (<b>SiTAZ</b>) was designed and synthesized as an electron-transporting material for deep blue phosphorescent organic light-emitting devices (PHOLEDs). Introducing a Si atom between two 3,4,5-triphenyl-1,2,4-triazole molecules, a high triplet energy of 2.84 eV, high glass transition temperature of 115 °C, and high electron mobility of 6.2 × 10<sup>−4</sup> cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> were achieved. By employing <b>SiTAZ</b> as a hole-blocking and electron-transporting material of iridium(III)[bis(4,6-difluorophenyl)pyridinato-<i>N</i>,C<sup>2</sup>′]tetrakis(1-pyrazolyl)borate (FIr6)-based deep blue phosphorescent OLEDs, a maximum external quantum efficiency (EQE) of 15.5%, an EQE of 13.8% at high luminance of 1000 cd m<sup>−2</sup>, and deep blue color coordinates of (0.16, 0.22) were achieved. The reduced efficiency roll-off at high luminance was attributed to the high triplet energy of the <b>SiTAZ</b>