scholarly journals Temperature evolution of quasiparticle dispersion and dynamics in semimetallic 1T−TiTe2 via high-resolution angle-resolved photoemission spectroscopy and ultrafast optical pump-probe spectroscopy

2021 ◽  
Vol 103 (11) ◽  
Author(s):  
Shuang-Xing Zhu ◽  
Chen Zhang ◽  
Qi-Yi Wu ◽  
Xiao-Fang Tang ◽  
Hao Liu ◽  
...  
Keyword(s):  
High Resolution ◽  
Temperature Evolution ◽  
Photoemission Spectroscopy ◽  
Optical Pump ◽  
Pump Probe ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Ultrafast Optical ◽  
Probe Spectroscopy

scholarly journals Understanding Multiferroic Hexagonal Manganites by Static and Ultrafast Optical Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Yu Ting Wang ◽  
Chih Wei Luo ◽  
Takayoshi Kobayashi
Keyword(s):  
Electronic Structure ◽  
Magnetic Ordering ◽  
Optical Pump ◽  
Pump Probe ◽  
Spin Lattice ◽  
Ultrafast Optical ◽  
Ultrafast Optical Spectroscopy ◽  
Hexagonal Manganites ◽  
Spin Charge Coupling ◽  
Probe Spectroscopy

Multiferroic hexagonal manganites ReMnO3studied by optics are reviewed. Their electronic structures were revealed by static linear and nonlinear spectra. Two transitions located at~1.7 eV and~2.3 eV have been observed and attributed to the interband transitions from the lower-lying Mn3+dxy/dx2-y2anddxz/dyzstates to the Mn3+d3z2-r2state, respectively. These so-called d-d transitions exhibit a blueshift as decreasing temperatures and an extra blueshift nearTN. This dramatic change indicates that the magnetic ordering seriously influences the electronic structure. On the other hand, the ultrafast optical pump-probe spectroscopy has provided the important information on spin-charge coupling and spin-lattice coupling. Because of the strongly correlation between electronic structure and magnetic ordering, the amplitude of the initial rising component inΔR/Rshows striking changes at the vicinity ofTN. Moreover, the coherent optical and acoustic phonons were observed on optical pump-probe spectroscopy. Both the amplitude and dephasing time of coherent phonons also exhibit significant changes atTN, which provide the evidence for spin-lattice interaction in these intriguing materials.

scholarly journals Measurement of Ultrafast Carrier Dynamics in Epitaxial Graphene

2008 ◽  
Vol 1081 ◽  
Author(s):  
Jahan M. Dawlaty ◽  
Shriram Shivaraman ◽  
Mvs Chandrashekhar ◽  
Michael G. Spencer ◽  
Farhan Rana
Keyword(s):  
Relaxation Times ◽  
Epitaxial Graphene ◽  
Optical Pump ◽  
Carrier Relaxation ◽  
Pump Probe ◽  
Graphene Layers ◽  
Ultrafast Optical ◽  
Interband Scattering ◽  
Ultrafast Carrier ◽  
Probe Spectroscopy

ABSTRACTUsing ultrafast optical pump-probe spectroscopy, we have measured carrier relaxation times in epitaxial graphene layers grown on SiC wafers. We find two distinct time scales associated with the relaxation of nonequilibrium photogenerated carriers. An initial fast relaxation transient in the 70-120 fs range is followed by a slower relaxation process in the 0.4-1.7 ps range. The slower relaxation time is found to be inversely proportional to the degree of crystalline disorder in the graphene layers as measured by Raman spectroscopy. We relate the measured fast and slow time constants to carrier-carrier and carrier-phonon intraband and interband scattering processes in graphene.

Ultrafast dynamics in pentacene and tetracene probed using optical pump-probe spectroscopy

2004 ◽  
Author(s):  
Verner K. Thorsmølle ◽  
R D. Averitt ◽  
J Demsar ◽  
X Chi ◽  
S Tretiak ◽  
...  
Keyword(s):  
Ultrafast Dynamics ◽  
Optical Pump ◽  
Pump Probe ◽  
Probe Spectroscopy

Electronic structures of layered Ta2NiS5 single crystals revealed by high-resolution angle-resolved photoemission spectroscopy

2018 ◽  
Vol 6 (15) ◽  
pp. 3976-3981 ◽  
Author(s):  
Kejun Mu ◽  
Haiping Chen ◽  
Yuliang Li ◽  
Yingying Zhang ◽  
Pengdong Wang ◽  
...  
Keyword(s):  
High Resolution ◽  
Single Crystals ◽  
Electronic Structures ◽  
Photoemission Spectroscopy ◽  
One Dimensional ◽  
Angle Resolved Photoemission Spectroscopy

Using high-resolution angle-resolved photoemission spectroscopy (ARPES), we systematically studied the electronic structures of quasi-one-dimensional (1D) ternary material Ta2NiS5 single crystals.

scholarly journals A tunable low-energy photon source for high-resolution angle-resolved photoemission spectroscopy

2012 ◽  
Vol 83 (11) ◽  
pp. 113103 ◽  
Author(s):  
John W. Harter ◽  
Philip D. C. King ◽  
Eric J. Monkman ◽  
Daniel E. Shai ◽  
Yuefeng Nie ◽  
...  
Keyword(s):  
High Resolution ◽  
Low Energy ◽  
Photoemission Spectroscopy ◽  
Energy Photon ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Photon Source
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