Laser-based double photoemission spectroscopy at surfaces

Chiang, Cheng‐Tien; Trützschler, Andreas; Huth, Michael; Kamrla, Robin; Schumann, F. O.; Widdra, W.

doi:10.1016/j.progsurf.2020.100572

Cited by 12 publications

(3 citation statements)

References 288 publications

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“…With effort, the pulse duration can be further decreased to <10 fs range. , The IR fiber laser pulses can also be converted in atomic gases to generate directly high harmonics in the VUV range . The broad tunability, short pulse duration, high power, and high repetition rates make the Yb-doped fiber laser pumped NOPA systems particularly well suited to study a broad spectrum of plasmonic phenomena in a variety of materials by ITR-mPP and ITR-PEEM methods. ,,,,,, …”

Section: Imaging Plasmons With Peemmentioning

confidence: 99%

“…317 The broad tunability, short pulse duration, high power, and high repetition rates make the Yb-doped fiber laser pumped NOPA systems particularly well suited to study a broad spectrum of plasmonic phenomena in a variety of materials by ITR-mPP and ITR-PEEM methods. 53,78,118,236,242,318,319 The advantage of PEEM is its ability to image the ultrafast dynamics of plasmons by recording ITR-PEEM movies. 3 For such measurements, laser pulses are split into identical pump and probe pulse replicas by transmission through an interferometer such as of a Mach−Zehnder design (MZI).…”

Section: Tr-peem Apparatusmentioning

confidence: 99%

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Ultrafast Photoemission Electron Microscopy: Imaging Plasmons in Space and Time

2020

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Plasmonics is a rapidly growing field spanning research and applications across chemistry, physics, optics, energy harvesting, and medicine. Ultrafast photoemission electron microscopy (PEEM) has demonstrated unprecedented power in the characterization of surface plasmons and other electronic excitations, as it uniquely combines the requisite spatial and temporal resolution, making it ideally suited for 3D space and time coherent imaging of the dynamical plasmonic phenomena on the nanofemto scale. The ability to visualize plasmonic fields evolving at the local speed of light on subwavelength scale with optical phase resolution illuminates old phenomena and opens new directions for growth of plasmonics research. In this review, we guide the reader thorough experimental description of PEEM as a characterization tool for both surface plasmon polaritons and localized plasmons and summarize the exciting progress it has opened by the ultrafast imaging of plasmonic phenomena on the nanofemto scale.

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Section: Imaging Plasmons With Peemmentioning

confidence: 99%

Section: Tr-peem Apparatusmentioning

confidence: 99%

Ultrafast Photoemission Electron Microscopy: Imaging Plasmons in Space and Time

2020

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“…There are two distinct processes that can cause a single photon to lead to the ejection of a correlated pair of electrons [Fig. 1(a),(b)] [8,[10][11][12][13][14][15]. In the first, the photon is absorbed and excites a valence band electron into a free photo-electron state, which subsequently ejects a second valence electron via an electron energy-loss (EELS)-like scattering event [Fig.…”

mentioning

confidence: 99%

Distinguishing finite momentum superconducting pairing states with two-electron photoemission spectroscopy

Mahmood,

Devereaux,

Abbamonte

et al. 2021

Preprint

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We show theoretically that double photoemission (2e-ARPES) may be used to identify the pairing state in superconductors in which the Cooper pairs have a nonzero center-of-mass momentum, qcm. We theoretically evaluate the 2e ARPES counting rate, P (2) , for the cases of a d x 2 −y 2 -wave superconductor, a pair-density-wave (PDW) phase, and a Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) phase. We show that P (2) provides direct insight into the center-of-mass momentum and spin state of the superconducting condensate, and thus can distinguish between these three different superconducting pairing states. In addition, P (2) can be used to map out the momentum dependence of the superconducting order parameter. Our results identify 2e-ARPES as an ideal tool for identifying and probing qcm = 0 superconducting pairing states in superconductors.

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