BaDElPh Home

Welcome to the Low Energy-ARPES beamline @ Elettra

The Band Dispersion and Electron-Phonon coupling (BaDElPh) beamline provides photons in the energy range 4.6-40 eV with high flux, high resolving power, and horizontal-vertical linear polarization. The beamline serves an end station to perform primarily high-resolution angle-resolved photoemission spectroscopy (ARPES) experiments in the low photon energy regime. Photon energies lower than 15 eV provide enhanced bulk sensitivity, allow for the highest momentum and energy resolution, and are useful in tuning matrix elements which vary rapidly at low energy. The availability of such low photon energies makes BaDElPh unique among the other ARPES beamlines at Elettra and around the world.

Research highlights | Publications

High-quality graphene

Graphene of extraordinary quality can be obtained on single crystal Ir(111) films, which are grown heteroepitaxially on Si(111) wafers with an yttria stabilized zirconia (YSZ) buffer layer. This method can represent a good way for an up-scalable and low cost synthesis of monolayer graphene.

  Struzzi et al., Carbon 81, 167 (2015).

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Electron-phonon coupling and superconductivity in graphene

We have performed an high-resolution ARPES investigation to try to find an electron donor for graphene that is capable of inducing strong electron–phonon coupling and superconductivity. Calcium is the most promising candidate for realizing superconductivity in graphene.

Fedorov et al., Nature Commun. 5, 3257 (2014);    Haberer et al., Phys. Rev. B 88, 081401(R) (2013).

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Surface-enhanced CDW in underdoped Bi(2201)-cuprates

Using ARPES at low photon energy we have discovered a temperature-dependent evolution of the CuO2 plane band dispersion in underdoped Bi2Sr2-xLaxCuO6+δ (Bi2201). This effect is limited to the surface and point to a surface-enhanced CDW instability.

  Rosen, Comin et al., Nature Commun. 4, 1977 (2013).

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Origin of electron accumulation in In2O3

We have used ARPES at low photon energy to directly image a quantized two-dimensional electron gas at the surface of In2O3(111). The microscopic origin of these electrons is shown to be oxygen vacancies, acting as doubly ionized shallow donors, localized at the surface.

  Zhang et al., Phys. Rev. Lett. 110, 056803 (2013).

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Surface-umklapp in ARPES at an organic-metal interface

We show that ARPES performed using low-energy photons on an ordered monolayer of Zn-phthalocyanine on Ag(110) allows to clearly distinguish genuine interface states from features of substrate photoelectrons diffracted by the molecular lattice. This is the first observation of surface-umklapp processes using organic layers instead of atomic adsorbates.

Bocquet et al., Phys. Rev. B 84, 241407(R) (2011);     Giovanelli et al., Phys. Rev. B 87, 035413 (2013).

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Gap opening and orbital character in Ba(FeCo)2As2

We report a high-momentum and energy resolution ARPES study of superconducting iron pnictide Ba(Fe1−xCox )2As2. Polarization- and temperature-dependent measurements at low photon energy allow to clarify the orbital character of the holelike pockets and to detect the gap opening across Tc along ΓX and ΓM providing the symmetry of the superconducting order parameter.

Mansart et al., Phys. Rev. B 83, 064516 (2011);      Phys. Rev. B 85, 144508 (2012).

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Attenuation lengths of low-energy electrons in solids

Performing PES at low photon energy, we give and estimation of the effective attenuation length (EAL) for low-energy electrons in CoO and Yb, establishing a moderate increase of the EAL upon electron energy decrease.

  Offi et al., Phys. Rev. B 77, 201101(R) (2008) ;      J. Phys.: Condens. Matter 22, 305002 (2010).

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Quasiparticles at the Mott transition in V2O3

Performing ARPES at low photon energy, we were able to observe for the first time the wavevector dependence of the quasiparticle peak in the metallic phase of V2O3 and to follow its attenuation at the surface. This point out LE-PES can be a sufficiently bulk sensitive probe in strongly correlated materials.

  Rodolakis et al., Phys. Rev. Lett. 102, 066805 (2009).

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Top News


2014-09-01: The BaDElPh beamline at Elettra has been included in the list of facilities accessible through the CERIC-ERIC call proposal. CERIC-ERIC offers access to several complementary facilities through a single proposal and a single access point. Submit your multifacility proposal by CERIC-ERIC Virtual Unified Office (VUO).

User Area

Proposal Submission

We invite users and collabrators to discuss their proposals with the beamline local contacts well in advance before the submission deadline. This is crucial for a careful assessment of the experiment feasibility and may lead to improvements in the proposed experimental plan. Our website provides a wealth of information on experiment feasibilty and proposal submission. For more info, please visit the user info section.

Call for Proposal

The deadline for proposal submission for beamtime allocation from January 1st to June 30th, 2016 will be September 15th, 2015.

Last Updated on Tuesday, 19 January 2016 15:23