Electronic transitions and dielectric function tensor of a YMnO3 single crystal in the NIR-VUV spectral range

The dielectric function tensor elements of an YMnO3 single crystal yield M0 critical point like band-band absorption with discrete spectrally localized Lorentzian transitions within the band gaps.

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Parametric modeling of the dielectric function and identification of the critical point of a CdMgTe alloy in the vacuum ultraviolet spectral range

Journal of the Korean Physical Society ◽

10.3938/jkps.60.1219 ◽

2012 ◽

Vol 60 (8) ◽

pp. 1219-1223

Author(s):

Tae Jung Kim ◽

Tae Ho Ghong ◽

Jae Jin Yoon ◽

Soon Yong Hwang ◽

Nilesh Barange ◽

...

Keyword(s):

Critical Point ◽

Dielectric Function ◽

Spectral Range ◽

Vacuum Ultraviolet ◽

Parametric Modeling

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A Model Dielectric Function for Graphene from the Infrared to the Ultraviolet

MRS Proceedings ◽

10.1557/opl.2013.525 ◽

2013 ◽

Vol 1505 ◽

Author(s):

A. Boosalis ◽

R. Elmquist ◽

M. Real ◽

N. Nguyen ◽

M. Schubert ◽

...

Keyword(s):

Critical Point ◽

Dielectric Function ◽

Spectral Range ◽

Pyrolytic Graphite ◽

Low Energy ◽

Point Model ◽

Exciton Resonance ◽

Resonance Energies ◽

Ellipsometry Data ◽

Spectroscopic Ellipsometry Data

ABSTRACTA modified critical point model dielectric function for graphene is derived here and used to analyze spectroscopic ellipsometry data obtained over a wide spectral range from 3 to 9 eV. Critical point and exciton resonance energies are extracted and discussed. Our findings indicate that epitaxial graphene on SiC to exhibits equivalent exciton behavior to that of suspended graphene. We further apply our model dielectric function to evaluate dielectric function data for highly oriented pyrolytic graphite reported in the literature. Excellent agreement is found between the critical point model developed here and the literature data even for the low energy spectral range up to 1 eV.

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From Semiconductor to Metal in a Flash: Observing Ultrafast Laser-Induced Phase Transformations

MRS Proceedings ◽

10.1557/proc-481-395 ◽

1997 ◽

Vol 481 ◽

Cited By ~ 3

Author(s):

J. P. Callan ◽

A. M.-T. Kim ◽

L. Huangt ◽

E. N. Glezer ◽

E. Mazur

Keyword(s):

Phase Transformations ◽

Dielectric Function ◽

Spectral Range ◽

Laser Excitation ◽

Spectroscopic Technique ◽

Ultrafast Laser ◽

Lattice Heating ◽

Fs Laser

ABSTRACTWe use a new broadband spectroscopic technique to measure ultrafast changes in the dielectric function of a material over the spectral range 1.5–3.5 eV following intense 70-fs laser excitation. The results reveal the nature of the phase transformations which occur in the material following excitation. We studied the response of GaAs and Si. For GaAs, there are three distinct regimes of behavior as the pump fluence is increased — lattice heating, lattice disordering, and a semiconductor-to-metal transition.

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Single crystal of two-dimensional mixed-halide copper-based perovskites with reversible thermochromism

Journal of Materials Chemistry C ◽

10.1039/d0tc04307a ◽

2021 ◽

Author(s):

Amr Elattar ◽

Hiroo Suzuki ◽

Ryuji Mishima ◽

Kodai Nakao ◽

Hiromi Ota ◽

...

Keyword(s):

Single Crystal ◽

Band Gaps ◽

Two Dimensional ◽

Facile Synthesis ◽

Reversible Thermochromism

Facile synthesis of single crystal of two-dimensional mixed-halide copper-based perovskites with tunable band gaps and their capability of exfoliation and reversible thermochromism.

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