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Nature and topology of the low-energy states inZrTe5
Moreschini, L.,Johannsen, J. C.,Berger, H.,Denlinger, J.,Jozwiack, C.,Rotenberg, E.,Kim, K. S.,Bostwick, A.,Grioni, M. American Physical Society 2016 Physical Review B Vol.94 No.8
<P>Long known for its peculiar resistivity, showing a thus far unexplained anomalous peak as a function of temperature, ZrTe5 has recently received rising attention in a somewhat different context. While both theoretical and experimental results seem to point to a nontrivial topology of the low-energy electronic states, there is no agreement on the nature of their topological character. Here, by an angle-resolved photoemission study of the evolution of the band structure with temperature and surface doping, we show that (i) the material presents a van Hove singularity close to the Fermi level, and (ii) no surface states exist at the (010) surface. These findings reconcile band structure measurements with transport results and establish the topology of this puzzling compound.</P>
Bilayer splitting and wave functions symmetry inSr3Ir2O7
Moreschini, L.,Moser, S.,Ebrahimi, A.,Dalla Piazza, B.,Kim, K. S.,Boseggia, S.,McMorrow, D. F.,Rønnow, H. M.,Chang, J.,Prabhakaran, D.,Boothroyd, A. T.,Rotenberg, E.,Bostwick, A.,Grioni, M. American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.89 No.20
The influence of dimensionality on the electronic properties of layered perovskite materials remains an outstanding issue. We address it here for Sr3Ir2O7, the bilayer compound of the iridate Srn+1IrnO3n+1 series. By angle-resolved photoemission spectroscopy we show that in this material the interlayer coupling is large and that the intercell coupling is, conversely, negligible. From a detailed mapping of the bilayer splitting, and from the intensity modulation of the bonding and antibonding bands with photon energy, we establish differences and similarities with the prominent case of the bilayer superconducting cuprates.
Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl)
Moreschini, L.,Autes, G.,Crepaldi, A.,Moser, S.,Johannsen, J.C.,Kim, K.S.,Berger, H.,Bugnon, Ph.,Magrez, A.,Denlinger, J.,Rotenberg, E.,Bostwick, A.,Yazyev, O.V.,Grioni, M. Elsevier Scientific Pub. Co 2015 Journal of electron spectroscopy and related pheno Vol.201 No.-
We present an overview of the new family of semiconductors BiTeX (X=I, Br, Cl) from the perspective of angle resolved photoemission spectroscopy. The strong band bending occurring at the surface potentially endows them with a large flexibility, as they are capable of hosting both hole and electron conduction, and can be modified by inclusion or adsorption of foreign atoms. In addition, their trigonal crystal structure lacks a center of symmetry and allows for both bulk and surface spin-split bands at the Fermi level. We elucidate analogies and differences among the three materials, also in the light of recent theoretical and experimental work.