scholarly journals Fermi surfaces and quasi-particle band dispersions of the iron pnictides superconductor KFe2As2 observed by angle-resolved photoemission spectroscopy

2011 ◽  
Vol 72 (5) ◽  
pp. 465-468 ◽  
Author(s):  
T. Yoshida ◽  
I. Nishi ◽  
A. Fujimori ◽  
M. Yi ◽  
R.G. Moore ◽  
...  
Keyword(s):  
Iron Pnictides ◽  
Photoemission Spectroscopy ◽  
Quasi Particle ◽  
Fermi Surfaces ◽  
Angle Resolved Photoemission Spectroscopy

scholarly journals Dirac nodal surfaces and nodal lines in ZrSiS

2019 ◽  
Vol 5 (5) ◽  
pp. eaau6459 ◽  
Author(s):  
B.-B. Fu ◽  
C.-J. Yi ◽  
T.-T. Zhang ◽  
M. Caputo ◽  
J.-Z. Ma ◽  
...  
Keyword(s):  
Photoemission Spectroscopy ◽  
Dirac Fermions ◽  
Fermi Surfaces ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Nodal Lines ◽  
Nodal Points ◽  
Different Dimensions ◽  
Topological Semimetals ◽  
Symmetry Protected ◽  
Nodal Surfaces

Topological semimetals are characterized by symmetry-protected band crossings, which can be preserved in different dimensions in momentum space, forming zero-dimensional nodal points, one-dimensional nodal lines, or even two-dimensional nodal surfaces. Materials harboring nodal points and nodal lines have been experimentally verified, whereas experimental evidence of nodal surfaces is still lacking. Here, using angle-resolved photoemission spectroscopy (ARPES), we reveal the coexistence of Dirac nodal surfaces and nodal lines in the bulk electronic structures of ZrSiS. As compared with previous ARPES studies on ZrSiS, we obtained pure bulk states, which enable us to extract unambiguously intrinsic information of the bulk nodal surfaces and nodal lines. Our results show that the nodal lines are the only feature near the Fermi level and constitute the whole Fermi surfaces. We not only prove that the low-energy quasiparticles in ZrSiS are contributed entirely by Dirac fermions but also experimentally realize the nodal surface in topological semimetals.

scholarly journals Electronic structure and signature of Tomonaga–Luttinger liquid state in epitaxial CoSb1−x nanoribbons

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Rui Lou ◽  
Minyinan Lei ◽  
Wenjun Ding ◽  
Wentao Yang ◽  
Xiaoyang Chen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Luttinger Liquid ◽  
Spectral Weight ◽  
Photoemission Spectroscopy ◽  
Strong Correlations ◽  
Fermi Surfaces ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Temperature Scaling ◽  
Interfacial Charge

AbstractRecently, monolayer CoSb/SrTiO3 has been proposed as a candidate harboring interfacial superconductivity in analogy with monolayer FeSe/SrTiO3. Experimentally, while the CoSb-based compounds manifesting as nanowires and thin films have been realized on SrTiO3 substrates, serving as a rich playground, their electronic structures are still unknown and yet to be resolved. Here, we have fabricated CoSb1−x nanoribbons with quasi-one-dimensional stripes on SrTiO3(001) substrates using molecular beam epitaxy and investigated the electronic structure by in situ angle-resolved photoemission spectroscopy. Straight Fermi surfaces without lateral dispersions are observed. CoSb1−x/SrTiO3 is slightly hole doped, where the interfacial charge transfer is opposite to that in monolayer FeSe/SrTiO3. The spectral weight near the Fermi level exhibits power-law-like suppression and obeys a universal temperature scaling, serving as the signature of Tomonaga–Luttinger liquid (TLL) state. The obtained TLL parameter of ~0.21 shows the underlying strong correlations. Our results not only suggest CoSb1−x nanoribbon as a representative TLL system but also provide clues for further investigations on the CoSb-related interface.

Angle-Resolved Photoemission Spectroscopy of Iron Pnictides

2012 ◽  
pp. 89-124
Author(s):  
Takafumi Sato ◽  
Pierre Richard ◽  
Kosuke Nakayama ◽  
Takashi Takahashi ◽  
Hong Ding
Keyword(s):  
Iron Pnictides ◽  
Photoemission Spectroscopy ◽  
Angle Resolved Photoemission Spectroscopy

scholarly journals Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
H. Suzuki ◽  
T. Kobayashi ◽  
S. Miyasaka ◽  
K. Okazaki ◽  
T. Yoshida ◽  
...  
Keyword(s):  
Order Parameter ◽  
Three Dimensional ◽  
Photoemission Spectroscopy ◽  
Superconducting Gap ◽  
Direct Identification ◽  
Fermi Surfaces ◽  
Iron Pnictide ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Sign Change ◽  
Gap Structure

Abstract The isovalent-substituted iron pnictide compound SrFe2(As1−xPx)2 exhibits multiple evidence for nodal superconductivity via various experimental probes, such as the penetration depth, nuclear magnetic resonance and specific heat measurements. The direct identification of the nodal superconducting (SC) gap structure is challenging, partly because the presence of nodes is not protected by symmetry but instead caused by an accidental sign change of the order parameter, and also because of the three-dimensionality of the electronic structure. We have studied the SC gaps of SrFe2(As0.65P0.35)2 in three-dimensional momentum space by synchrotron and laser-based angle-resolved photoemission spectroscopy. The three hole Fermi surfaces (FSs) at the zone center have SC gaps with different magnitudes, whereas the SC gaps of the electron FSs at the zone corner are almost isotropic and kz-independent. As a possible nodal SC gap structure, we propose that the SC gap of the outer hole FS changes sign around the Z-X [(0, 0, 2π) − (π, π, 2π)] direction.

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