Journal ArticleDOI
Full characterization and optimization of a femtosecond ultraviolet laser source for time and angle-resolved photoemission on solid surfaces.
TLDR
The UV source has been fully characterized spatially, spectrally, and temporally and its potential for time and angle-resolved photoemission is demonstrated through Fermi surface mapping and photoexcited electron dynamics in Bismuth.Abstract:
A novel experimental apparatus for time and angle-resolved photoemission on solid surfaces is presented. A 6.28 eV laser source operating at 250 kHz repetition rate is obtained by frequency mixing in nonlinear beta barium borate crystals. This UV light source has a high photon flux of 1013 photons/s with relatively low number of photons/pulse so that Fermi surface mapping over a wide region of the Brillouin zone is possible while mitigating space charge effects. The UV source has been fully characterized spatially, spectrally, and temporally. Its potential for time and angle-resolved photoemission is demonstrated through Fermi surface mapping and photoexcited electron dynamics in Bismuth. True femtosecond time resolution <65 fs is obtained while the energy resolution of 70 meV appears to be mainly limited by the laser bandwidth.read more
Citations
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Journal ArticleDOI
Ultrafast surface carrier dynamics in the topological insulator Bi2Te3
M. Hajlaoui,E. Papalazarou,J. Mauchain,Gabriel Lantz,N. Moisan,Davide Boschetto,Zhigang Jiang,Ireneusz Miotkowski,Yong P. Chen,Amina Taleb-Ibrahimi,Luca Perfetti,Marino Marsi +11 more
TL;DR: It is found that the thermalization of the surface states is initially determined by interband scattering from the bulk conduction band, lasting for about 0.5 ps; this establishes a correlation between the nanoscale thickness of the bulk charge reservoir and the evolution of the ultrafast carrier dynamics in the surface Dirac cone.
Journal ArticleDOI
Ultrafast Surface Carrier Dynamics in the Topological Insulator Bi2Te3
M. Hajlaoui,E. Papalazarou,J. Mauchain,Gabriel Lantz,N. Moisan,Davide Boschetto,Zhigang Jiang,Ireneusz Miotkowski,Yong P. Chen,Amina Taleb-Ibrahimi,Luca Perfetti,Marino Marsi +11 more
TL;DR: In this paper, the authors studied the ultrafast evolution of the surface electronic structure of the topological insulator Bi(2)Te(3) following femtosecond laser excitation.
Journal ArticleDOI
Tuning a Schottky barrier in a photoexcited topological insulator with transient Dirac cone electron-hole asymmetry
Mahdi Hajlaoui,E. Papalazarou,J. Mauchain,Luca Perfetti,Amina Taleb-Ibrahimi,Fabien Navarin,Miguel Monteverde,Pascale Auban-Senzier,Claude Pasquier,N. Moisan,Davide Boschetto,Madhab Neupane,M. Z. Hasan,Tomasz Durakiewicz,Zhigang Jiang,Yang Xu,Ireneusz Miotkowski,Yong P. Chen,Shuang Jia,Huiwen Ji,Robert J. Cava,Marino Marsi +21 more
TL;DR: The interplay of surface and bulk transient carrier dynamics in a photoexcited topological insulator can control an essential parameter for photoconductivity-the balance between excess electrons and holes in the Dirac cone.
Journal ArticleDOI
Time- and angle-resolved photoemission spectroscopy of solids in the extreme ultraviolet at 500 kHz repetition rate
Michele Puppin,Yunpei Deng,C. W. Nicholson,Johannes Feldl,Niels B. M. Schröter,Hendrik Vita,Patrick S. Kirchmann,Claude Monney,Laurenz Rettig,Martin Wolf,Ralph Ernstorfer +10 more
TL;DR: This table-top experiment allows high-repetition rate pump-probe experiments of electron dynamics in occupied and normally unoccupied (excited) states in the entire Brillouin zone and with a temporal system response function below 40 fs.
Journal ArticleDOI
Ultrafast dynamics during the photoinduced phase transition in VO2
Daniel Wegkamp,Julia Stähler +1 more
TL;DR: In this article, the authors show that the phase transition of VO2 from a monoclinic insulator to a rutile metal, which occurs thermally at T C ǫ = 340 K, can also be driven by strong photoexcitation.
References
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Journal ArticleDOI
Angle-resolved photoemission studies of the cuprate superconductors
TL;DR: A review of the most recent ARPES results on the cuprate superconductors and their insulating parent and sister compounds is presented in this article, with the purpose of providing an updated summary of the extensive literature.
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TL;DR: In this paper, the spin-orbit interaction leads to a strong splitting of the surface-state bands on low-index surfaces of Bi. The dispersion of the states and the corresponding Fermi surfaces are profoundly modified in the whole surface Brillouin zone.
Journal ArticleDOI
The surfaces of bismuth: Structural and electronic properties
TL;DR: In this paper, the effect of the spin-orbit interaction on low-index surfaces of the group V semimetal bismuth has been studied and the main focus is on the geometric and electronic structure.
Journal ArticleDOI
Collapse of long-range charge order tracked by time-resolved photoemission at high momenta
Timm Rohwer,S. Hellmann,M. Wiesenmayer,C. Sohrt,A. Stange,Bartosz Slomski,Adra Carr,Yanwei Liu,Yanwei Liu,Luis Miaja Avila,M. Kalläne,Stefan Mathias,Stefan Mathias,Lutz Kipp,Kai Rossnagel,Michael Bauer +15 more
TL;DR: It is anticipated that the experimental advance represented by the present study will be useful to study the ultrafast dynamics and microscopic mechanisms of electronic phenomena in a wide range of materials.