Flatness and boundness of photonic drumhead surface state in a metallic lattice

AbstractNodal chain (NC) semi-metals have the degeneracy of interlacing rings in their band structure in momentum space. With the projection of degenerate rings towards crystal boundaries, there is a special type of surface dispersion appearing at surface Brillouin zone and termed drumhead surface state (DSS). Previously, experimental investigations on photonic NC and DSS have been done on metallic photonic crystals at microwave frequencies. However, far-field detection of DSS and its coupling to radiative modes in free space have not been studied. In the work, we analyze the photonic DSS in a metallic lattice by angle-resolved far-field reflection measurement and numerical simulation at terahertz (THz) frequencies, and reveal its flatness and boundness in band structure, even in the radiation continuum. Particularly, the DSS band can be tuned being from negatively dispersive via flat to positively dispersive by a single surface parameter, and the DSS at Γ point in surface Brillouin zone is in fact a symmetry-protected bound state in the continuum. Our results might have some potential applications towards THz photonics.

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ANGLE-RESOLVED PHOTOEMISSION STUDIES OF THE 3C–SiC(001)(2×1) SURFACE

Surface Review and Letters ◽

10.1142/s0218625x9900127x ◽

1999 ◽

Vol 06 (06) ◽

pp. 1151-1157 ◽

Cited By ~ 2

Author(s):

L. DUDA ◽

L. S. O. JOHANSSON ◽

B. REIHL ◽

H. W. YEOM ◽

S. HARA ◽

...

Keyword(s):

Electronic Structure ◽

Synchrotron Radiation ◽

Binding Energy ◽

Brillouin Zone ◽

Surface State ◽

Electronic States ◽

Dangling Bond ◽

Poor Agreement ◽

Bond State ◽

Surface Brillouin Zone

We have investigated the electronic structure of the single-domain 3C–SiC(001)(2×1) using angle-resolved photoemission and synchrotron radiation. Two different surface-state bands are clearly identified within the bulk bandgap. The upper band has a binding energy of 1.4 eV at the center of the surface Brillouin zone (SBZ) and shows a weak dispersion of 0.3 eV in the [Formula: see text] direction, but is nondispersive in the perpendicular direction. It has a polarization dependence suggesting a pz character, as expected for a Si dangling-bond state. The second band is located at 2.4 eV binding energy and is nondispersive. The weak or nonexistent dispersions suggest very localized electronic states at the surface and show poor agreement with calculated dispersions for the proposed models for the 2×1 and c(4×2) reconstructions.

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Orbitals and bands at metal surfaces: photoemission from the {110} surface of tungsten

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1981.0108 ◽

1981 ◽

Vol 376 (1767) ◽

pp. 565-583 ◽

Cited By ~ 13

Keyword(s):

Electronic Structure ◽

Band Structure ◽

Surface State ◽

Photon Emission ◽

Tight Binding ◽

Tight Binding Approximation ◽

The Third ◽

Surface Brillouin Zone ◽

Orbital Character ◽

Bulk Band

The electronic structure of the {110} surface of tungsten has been investigated by using angle-resolved photoemission. A surface state has been identified and characterized throughout the surface Brillouin zone (s. B. z.). Its dispersion is found to correlate with the projected band gap between the third and fourth bands of the tungsten bulk band structure. It is identified by comparison with Inglesfield’s calculation as having predominantly m = 1 d-orbital character. With photon energies of 21.2 and 40.8 eV, intense photoemission from the surface state is only observed after surface Umklapp, whereas, with 16.8 eV, photon emission is observed in both the first and second s. B. zs. The applicability of the tight-binding approximation to the elucidation of the electronic structure of a metal surface is examined with particular reference to this surface state. A qualitative analysis of the observed photoemission intensities is consistent with emission from a tungsten e g orbital that is hybridized with e g orbitals on neighbouring atoms.

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Surface state at theK¯point of the surface Brillouin zone on Cu{111}

Physical Review B ◽

10.1103/physrevb.54.5092 ◽

1996 ◽

Vol 54 (7) ◽

pp. 5092-5096 ◽

Cited By ~ 11

Author(s):

Y. Yang ◽

S. C. Wu ◽

F. Q. Liu ◽

K. Ibrahim ◽

H. J. Qian ◽

...

Keyword(s):

Brillouin Zone ◽

Surface State ◽

Surface Brillouin Zone

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Surface State at Kmacr- Point of Surface Brillouin Zone on Cu{111} Surface

Chinese Physics Letters ◽

10.1088/0256-307x/13/6/018 ◽

1996 ◽

Vol 13 (6) ◽

pp. 465-468

Author(s):

Yi Yang ◽

Feng-qin Liu ◽

Jin-feng Jia ◽

Yu-hui Dong ◽

Kurash Ibrahim ◽

...

Keyword(s):

Brillouin Zone ◽

Surface State ◽

Surface Brillouin Zone

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The $(\sqrt{3}\times\sqrt{3}){\rm R}30^{\circ}$-Reconstructed 6H–SiC(0001): A Semiconducting Surface

Surface Review and Letters ◽

10.1142/s0218625x98000360 ◽

1998 ◽

Vol 05 (01) ◽

pp. 193-197 ◽

Cited By ~ 17

Author(s):

I. Forbeaux ◽

J.-M. Themlin ◽

V. Langlais ◽

L. M. Yu ◽

H. Belkhir ◽

...

Keyword(s):

Charge Transfer ◽

Fermi Level ◽

Brillouin Zone ◽

Surface State ◽

Photoemission Spectroscopy ◽

Metallic Behavior ◽

Inverse Photoemission ◽

Surface Brillouin Zone ◽

Inverse Photoemission Spectroscopy ◽

Good Agreement

k//-resolved inverse-photoemission spectroscopy of the [Formula: see text] reconstruction of 6H–SiC(0001) reveals a sharp surface state U located 1.10±0.05 eV above the Fermi level at the center of the surface Brillouin zone with a total bandwidth of 0.34±0.05 eV. This value is in good agreement with recent LDA calculations which predict an adatom-induced surface state Σ1 which should be half-filled. In this model, the adatoms are Si atoms occupying the T 4 site above a compact SiC(0001) (Si) termination. In contrast to the predicted metallic behavior, the U state remains completely unoccupied throughout the whole Brillouin zone, and the surface is semiconducting. We propose that some charge transfer from the Si adatoms towards subsituted C atoms in the terminating bilayer stabilizes the reconstruction by moving up the Σ1 state away from the Fermi level.

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Accessing Surface Brillouin Zone and Band Structure of Picene Single Crystals

Physical Review Letters ◽

10.1103/physrevlett.108.226401 ◽

2012 ◽

Vol 108 (22) ◽

Cited By ~ 49

Author(s):

Qian Xin ◽

Steffen Duhm ◽

Fabio Bussolotti ◽

Kouki Akaike ◽

Yoshihiro Kubozono ◽

...

Keyword(s):

Band Structure ◽

Single Crystals ◽

Brillouin Zone ◽

Surface Brillouin Zone

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A NEGATIVE SPIN-POLARIZATION STRUCTURE OF Ni(110): PROBED BY SPIN- AND ANGLE-RESOLVED PHOTOELECTRON SPECTROSCOPY

Surface Review and Letters ◽

10.1142/s0218625x02003640 ◽

2002 ◽

Vol 09 (02) ◽

pp. 1287-1290

Author(s):

S. QIAO ◽

A. KIMURA ◽

H. NARITA ◽

K. YAJI ◽

E. KOTANI ◽

...

Keyword(s):

Binding Energy ◽

Spin Polarization ◽

Brillouin Zone ◽

Surface State ◽

Photoelectron Spectroscopy ◽

Text Line ◽

Negative Polarization ◽

Polarization Structure ◽

Surface Brillouin Zone

We already reported the spin- and angle-resolved photoelectron measurements of Ni(110), Ni (110)- p (2 × 1) O and Ni (110)- c (2 × 2) S along the [Formula: see text] line of the Ni(110) surface Brillouin zone using He I radiation. We found that the structure at about 1.3 eV binding energy showed unusual character near the [Formula: see text] point. The spin polarization of this structure was observed to be negative. After the adsorption of oxygen and sulfur on the Ni(110) surface, the degree of negative spin polarization was found to decrease. To study the property of this state, that it is a bulk or surface-related, and to clarify the origin of the negative polarization, we performed spin- and angle-resolved photoemission measurements for Ni(110) along the LW line of its bulk Brillouin zone. The results show that this negative polarization structure can be attributed to a surface state near the [Formula: see text] point.

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The Surface Electronic Band Structure CoS2(001)

MRS Proceedings ◽

10.1557/proc-1119-l03-03 ◽

2008 ◽

Vol 1119 ◽

Author(s):

Ning Wu ◽

Ya. B. Losovyj ◽

Michael Manno ◽

Chris Leighton ◽

Peter Dowben

Keyword(s):

Band Structure ◽

Fermi Level ◽

Single Crystal ◽

Brillouin Zone ◽

Electronic Band Structure ◽

Exchange Splitting ◽

High Quality ◽

Surface Band ◽

Electronic Band ◽

Surface Brillouin Zone

AbstractAngle-resolved photoemission was used to study the surface electronic band structure of ferromagnetic CoS2(below 120K) in high-quality single crystal samples. Strongly dispersing Co t2g bands are identified along the <100> k// direction. Fermi level crossings are identified along this Γ - X line (of the surface Brillouin zone) in higher resolution photoemission spectra, suggesting that the overall polarization may be controlled by the details of the band structure, particularly the surface band structure, rather than by exchange splitting on the Co atoms.

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