Applications for ultimate spatial resolution in LASER based μ - ARPES: A FeSe case study

Schwier, Eike F.; Takita, Hitoshi; Mansur, Webe João; Ino, A.; Hoesch, Moritz; Watson, M. D.; Haghighirad, Amir A.; Shimada, Kenya

doi:10.1063/1.5084618

Cited by 8 publications

(7 citation statements)

References 23 publications

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“…1(d), but do not purely consist of a single domain. Such variation on a more macroscopic length scale was observed in the laser micro-ARPES measurements by Schwier et al [39] but was understood to correspond to local strain variation favoring particular domain orientations, rather than individual domains. The length scales we observe correspond to those obtained by polarized light imaging [16], but we caution that the sizes of domains may depend on many factors (sample quality and preparation, temperature, cooling rate, etc).…”

Section: Discussionmentioning

confidence: 78%

Revealing the single electron pocket of FeSe in a single orthorhombic domain

et al. 2020

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We measure the electronic structure of FeSe from within individual orthorhombic domains. Enabled by an angle-resolved photoemission spectroscopy beamline with a highly focused beam spot (nano-ARPES), we identify clear stripelike orthorhombic domains in FeSe with a length scale of approximately 1-5 μm. Our photoemission measurements of the Fermi surface and band structure within individual domains reveal a single electron pocket at the Brillouin zone corner. This result provides clear evidence for a one-electron-pocket electronic structure of FeSe, observed without the application of uniaxial strain, and calls for further theoretical insight into this unusual Fermi surface topology. Our results also showcase the potential of nano-ARPES for the study of correlated materials with local domain structures.

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Section: Discussionmentioning

confidence: 78%

Revealing the single electron pocket of FeSe in a single orthorhombic domain

et al. 2020

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“…All these indicate that the applications of micro-ARPES can extend far beyond the present study. Indeed, the micro-ARPES has been successfully applied to the study of the electronic structure of microscale materials/domains: high-T c cuprates [121][122][123][124], high-T c iron pnictides [125][126][127], and the two-dimensional vdW heterostructures [114].…”

Section: Laser-based Micro-arpesmentioning

confidence: 99%

High-resolution angle-resolved photoemission spectroscopy and microscopy

Iwasawa

2020

Electron. Struct.

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This review outlines fundamental principles, instrumentation, and capabilities of angle-resolved photoemission spectroscopy (ARPES) and microscopy. We will present how high-resolution ARPES enables to investigate fine structures of electronic band dispersions, Fermi surfaces, gap structures, and many-body interactions, and how angle-resolved photoemission microscopy (spatially-resolved ARPES) utilizing micro/nano-focused light allows to extract spatially localized electronic information at small dimensions. This work is focused on specific results obtained by the author from strongly correlated copper and ruthenium oxides, to help readers to understand consistently how these techniques can provide essential electronic information of materials, which can, in principle, apply to a wide variety of systems.

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“…This inevitably means that a superposition of intensity from two domains is detected in a traditional ARPES set-up, with a typical beam spot of 50 µm or larger. Developments in laser-ARPES have reduced the spot size to a few microns [52], and in a recent study Schwier et al were able to visualise some spatial variation of the intensities of hole pocket dispersions near the Γ point in FeSe, which was associated with domain structures [53]. However, the capability to combine excellent spatial resolution and full k-space mapping has become recently accessible to state-of-the-art nano-ARPES, where the beam spot can be focused to better than 700 nm in diameter.…”

Section: Nano-arpes: Band Dispersions From Within Individual Domainsmentioning

confidence: 99%

Probing the reconstructed Fermi surface of antiferromagnetic BaFe2As2 in one domain

et al. 2019

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We revisit the electronic structure of BaFe2As2, the archetypal parent compound of the Fe-based superconductors, using angle-resolved photoemission spectroscopy (ARPES). Our high-resolution measurements of samples "detwinned" by the application of a mechanical strain reveal a highly anisotropic 3D Fermi surface in the low temperature magnetic phase. By comparison of the observed dispersions with ab-initio calculations, we argue that overall it is magnetism, rather than orbital ordering, which is the dominant effect, reconstructing the electronic structure across the Fe 3d bandwidth. Finally, we measure band dispersions directly from within one domain without applying strain to the sample, by using the sub-micron focused beam spot of a nano-ARPES instrument. :1902.10266v1 [cond-mat.supr-con] arXiv

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Applications for ultimate spatial resolution in LASER based μ - ARPES: A FeSe case study

Cited by 8 publications

References 23 publications

Revealing the single electron pocket of FeSe in a single orthorhombic domain

Revealing the single electron pocket of FeSe in a single orthorhombic domain

High-resolution angle-resolved photoemission spectroscopy and microscopy

Probing the reconstructed Fermi surface of antiferromagnetic BaFe2As2 in one domain

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