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Université de Neuchâtel

Non-uniform doping across the Fermi surface of NbS2 intercalates

Battaglia, Corsin ; Cercellier, H. ; Despont, L. ; Monney, Claude ; Prester, M. ; Berger, H. ; Forró, L. ; Garnier, Michael Bernard Gunnar ; Aebi, Philipp

In: The European Physical Journal B - Condensed Matter and Complex Systems, 2007, vol. 57, no. 4, p. 385-390

Magnetic ordering of the first row transition metal intercalates of NbS2 due to coupling between the conduction electrons and the intercalated ions has been explained in terms of Fermi surface nesting. We use angle-resolved photoelectron spectroscopy to investigate the Fermi surface topology and the valence band structure of the quasi-two-dimensional layer compounds...

Université de Neuchâtel

Stabilization of silicon honeycomb chains by trivalent adsorbates

Battaglia, Corsin ; Cercellier, H. ; Garnier, Michael Bernard Gunnar ; Aebi, Philipp

In: Europhysics Letters (EPL), 2007, vol. 77, no. 36003, p. 1-5

The atomic structure of self-assembled quasi-one-dimensional Gd chains on Si(111) has been investigated by low-energy electron diffraction and scanning tunneling microscopy. Based on comparison between Gd and Ca chains we show that this Gd-induced surface reconstruction belongs to the class of honeycomb chain-channel structures. This clearly demonstrates that, besides monovalent and divalent...

Université de Neuchâtel

Fermi-surface-induced lattice distortion in NbTe2

Battaglia, Corsin ; Cercellier, Hervé ; Clerc, Florian ; Despont, Laurent ; Garnier, Michael Gunnar ; Koitzsch, Christian ; Aebi, Philipp ; Berger, Helmuth ; Forró, László ; Ambrosch-Draxl, Claudia

In: Physical Review B, 2005, vol. 72, no. 195114, p. 1-10

The origin of the monoclinic distortion and domain formation in the quasi-two-dimensional layer compound NbTe2 is investigated. Angle-resolved photoemission shows that the Fermi surface is pseudogapped over large portions of the Brillouin zone. Ab initio calculation of the electron and phonon band structure as well as the static RPA susceptibility lead us to conclude that Fermi...

Université de Neuchâtel

Structural and electronic properties of self-assembled nanostructures on silicon surfaces

Battaglia, Corsin ; Aebi, Philipp (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th.2007.

This thesis reports new results on self-assembled nanostructures on silicon surfaces studied by a combination of low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS), dynamical low-energy electron diffraction (LEED), angle-resolved photoemission spectroscopy (ARPES) and ¯rst-principles calculations within the framework of density functional theory (DFT). Understanding...

Université de Fribourg

Structure and stability of the Si(331)-(12×1) surface reconstruction investigated with first-principles density functional theory

Battaglia, Corsin ; Onida, Giovanni ; Gaál-Nagy, Katalin ; Aebi, Philipp

In: Physical Review B: condensed matter and materials physics, 2009, vol. 80, no. 21, p. 214102

We recently proposed a structural model for the Si(331)-(12×1) surface reconstruction containing silicon pentamers and adatoms as elementary structural building blocks. Using first-principles density functional theory we here investigate the stability of a variety of adatom configurations and determine the lowest-energy configuration. We also present a detailed comparison of the energetics...

Université de Fribourg

Valence band structure of the Si(331)-(12 × 1) surface reconstruction

Battaglia, Corsin ; Schwier, Eike Fabian ; Monney, Claude ; Didiot, Clément ; Mariotti, Nicolas ; Gaál-Nagy, Katalin ; Onida, Giovanni ; Garnier, Michael Gunnar ; Aebi, Philipp

In: Journal of Physics: Condensed Matter, 2011, vol. 23, no. 13, p. 135003

Using angle-resolved photoelectron spectroscopy we investigate the electronic valence band structure of the Si(331)-(12 × 1) surface reconstruction for which we recently proposed a structural model containing silicon pentamers as elementary structural building blocks. We find that this surface, reported to be metallic in a previous study, shows a clear band gap at the Fermi energy, indicating...

Université de Neuchâtel

Evidence for an Excitonic Insulator Phase in 1T–TaS2

Cercellier, H. ; Monney, Claude ; Clerc, F. ; Battaglia, Corsin ; Despont, Laurent ; Garnier, Michael Bernard Gunnar ; Beck, H. ; Aebi, Philipp ; Patthey, L. ; Berger, H. ; Forró, L.

In: Physical Review Letters, 2007, vol. 99, no. 146403, p. 1-4

We present a new high-resolution angle-resolved photoemission study of 1T–TaS2 in both its room-temperature, normal phase and its low-temperature, charge-density wave phase. At low temperature the photoemission spectra are strongly modified, with large band renormalizations at high-symmetry points of the Brillouin zone and a very large transfer of spectral weight to backfolded...

Université de Neuchâtel

Fermi surface of layered compounds and bulk charge density wave systems

Clerc, F. ; Battaglia, Corsin ; Cercellier, H. ; Monney, Claude ; Berger, H. ; Despont, Laurent ; Garnier, Michael Bernard Gunnar ; Aebi, Philipp

In: Journal of Physics : Condensed Matter, 2007, vol. 19, no. 355002, p. 1-17

A review is given of recent angle-resolved photoemission (ARPES) experiments and analyses on a series of layered charge density wave materials. Important aspects of ARPES are recalled in view of its capability for bulk band, Fermi surface and spectral function mapping despite its surface sensitivity. Discussed are TaS2, TaSe2, NbTe2, TiSe2 and...

Université de Neuchâtel

Lattice-distortion-enhanced electron-phonon coupling and Fermi surface nesting in 1T-TaS2

Clerc, Florian ; Battaglia, Corsin ; Bovet, M ; Despont, Laurent ; Monney, Claude ; Cercellier, Hervé ; Garnier, Michael Bernard Gunnar ; Aebi, Philipp ; Berger, Helmuth ; Forró, László

In: Physical Review B, 2006, vol. 74, no. 155114, p. 1-7

The temperature dependence of the electronic structure of the quasi-two-dimensional material 1T-TaS2 is revisited by considering angle-resolved photoemission spectroscopy (ARPES) and density functional theory to calculate the imaginary part of the static electronic susceptibility characterizing the nesting strength. While nesting appears to play a role in the high temperature...

Université de Fribourg

Evolution of the charge density wave superstructure in ${\mathrm{ZrTe}}_{3}$ under pressure

Hoesch, Moritz ; Garbarino, Gaston ; Battaglia, Corsin ; Aebi, Philipp ; Berger, Helmuth

In: Physical Review B, 2016, vol. 93, no. 12, p. 125102

The material ZrTe3 is a well-known example of an incommensurate periodic lattice distortion (PLD) at low temperatures due to a charge density wave (CDW). Previous studies have found a sharp boundary as a function of pressure between CDW below 5 GPa and bulk superconductivity above this value. We present a study of low-temperature-high-pressure single crystal x-ray diffraction along with ab initio...