Structure and lattice dynamics of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cl</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>001</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>studied by helium-a

Farzaneh, M.; Liu, X.-F.; El‐Batanouny, M.; Chou, F. C.

doi:10.1103/physrevb.72.085409

Cited by 8 publications

(9 citation statements)

References 45 publications

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“…The scattered He beam was collected by an angle-resolved detector mounted on a two-axis goniometer, which allows the scattered angle θ f to be varied independently from θ i [31], and allows in-and out-of the scattering-plane measurements. As shown in figure 8, the detector is comprised of an electron gun and a multichannel plate (MCP) electron multiplier [32].…”

Section: Scattered Beam Detection Techniquementioning

confidence: 99%

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Interaction of Phonons and Dirac Fermions on the Surface ofBi2Se3: A Strong Kohn Anomaly

et al. 2011

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We report the first measurements of phonon dispersion curves on the (001) surface of the strong three-dimensional topological insulator Bi 2 Se 3 . The surface phonon measurements were carried out with the aid of coherent helium beam surface scattering techniques. The results reveal a prominent signature of the exotic metallic Dirac fermion quasi-particles, including a strong Kohn anomaly. The signature is manifest in a low energy isotropic convex dispersive surface phonon branch with a frequency maximum of 1.8 THz, and having a V-shaped minimum at approximately 2k F that defines the Kohn anomaly.Theoretical analysis attributes this dispersive profile to the renormalization of the surface phonon excitations by the surface Dirac fermions. The contribution of the Dirac fermions to this renormalization is derived in terms of a Coulomb-type perturbation model.

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Section: Scattered Beam Detection Techniquementioning

confidence: 99%

“…j . The electron-phonon interaction can be generically written as We now proceed to represent the interaction Hamiltonian (31) in Fourier space. This is achieved by expressing:…”

Section: Hamiltonian Of the Electron-phonon Interacting Systemmentioning

confidence: 99%

Interaction of Phonons and Dirac Fermions on the Surface ofBi2Se3: A Strong Kohn Anomaly

et al. 2011

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“…One can postulate that the 4/m distortion only occurs at the surface. However, surface-sensitive Heatom scattering [23] and angle-resolved photoemission spectroscopy measurements [24] on Sr 2 CuO 2 Cl 2 show no signs of (001) surface reconstruction or unit cell enlargement. Even if the mirror planes are somehow broken at the surface, it still cannot explain our data because ED SHG from the surface of a 4/m structure is forbidden in the SS channel [19].…”

Section: (B)]mentioning

confidence: 91%

“…But x-ray mag-netic circular dichroism measurements on Sr 2 CuO 2 Cl 2 detect no out-of-plane spin canting [26], in keeping with its reported structure that forbids DM interactions. Surface spin canting also seems unlikely given the absence of surface reconstruction [23,24]. Furthermore, in the spontaneous spin canting scenario, one might expect to find a spatial distribution of time-reversed domains characterized by ±Φ that can also flip upon thermal cycling across T N .…”

Section: (B)]mentioning

confidence: 99%

Mirror symmetry breaking in a model insulating cuprate

et al. 2021

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“…The experimental setup and procedures of the HAS measurements are described in details in Ref. [16,18].…”

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Temperature-dependent anomalies in the structure of the (001) surface of LiCu2O2

et al. 2011

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Surface corrugation functions, derived from elastic helium atom scattering (HAS) diffraction patterns at different temperatures, reveal that the Cu 2+ rows in the (001) surface of LiCu2O2 undergo an outward displacement of about 0.15Å as the surface was cooled down to 140 K. This is probably the first time that isolated one-dimensional magnetic ion arrays were realized, which qualifies the Li 1+ Cu 2+ O 2− 2 surface as a candidate to study one-dimensional magnetism. The rising Cu 2+ rows induce a surface incommensurate structural transition along the a-direction. Surface equilibrium analysis showed that the surface Cu 2+ ions at bulk-like positions experience a net outward force along the surface normal which is relieved by the displacement. Temperature-dependent changes of the surface phonon dispersions obtained with the aid of inelastic HAS measurements combined with surface lattice dynamical calculations are also reported.

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Structure and lattice dynamics ofSr2CuO2Cl2(001)studied by helium-a

Cited by 8 publications

References 45 publications

Interaction of Phonons and Dirac Fermions on the Surface ofBi2Se3: A Strong Kohn Anomaly

Interaction of Phonons and Dirac Fermions on the Surface ofBi2Se3: A Strong Kohn Anomaly

Mirror symmetry breaking in a model insulating cuprate

Temperature-dependent anomalies in the structure of the (001) surface of LiCu2O2

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