Trivial Fermi arcs in the candidate type-II Weyl semimetal WTe2

Trivial Fermi arcs in the candidate type-II Weyl semimetal WTe2

September 2016: Using micro focused laser ARPES we have observed large Fermi arcs on both the top and bottom surface of WTe2. Our surface electronic structure calculations demonstrate that these Fermi arcs are topologically trivial and that their existence is independent of the presence of type-II Weyl points in the bulk band structure. Contrary to common…

Fermi arcs and their topological character in the type-II Weyl semimetal MoTe2

Fermi arcs and their topological character in the type-II Weyl semimetal MoTe2

We published in Phys. Rev. X a combined experimental and theoretical study of MoTe2, which provides new evidence for the existence of type-II Weyl semimetals. Using angle-resolved photoemission, we show that the inequivalent top and bottom (001) surfaces of MoTe2 host distinct Fermi arc surface states. Employing systematic electronic structure calculations, we show that some of these…

Alberto de la Torre receives the “Prix Vacheron Constantin des Sciences 2016”

Alberto de la Torre receives the “Prix Vacheron Constantin des Sciences 2016”

Alberto de la Torre has been awarded the “Prix Vacheron Constantin des Sciences 2016” for his doctoral thesis entitled Spectroscopic Studies of Layered Iridium Oxides and reporting “the doping evolution of the electronic structure of the single and bilayer iridates Sr2IrO4 and Sr3Ir2O7 from angle resolved photoemission (ARPES) experiments”. This prize encourage young students from…

The fate of Fröhlich polarons in SrTiO3 – Nature Materials

The fate of Fröhlich polarons in SrTiO3 – Nature Materials

April 2016: We publish in Nature Materials a study of electron-phonon interactions in the SrTiO3(001) two-dimensional electron liquid. The band insulator strontium titanate, SrTiO3, widely used as substrate for growing oxides films, is a highly fascinating material in its own right. Most notably, it becomes superconducting upon doping with less than 1 excess electron per…

Flavio Bruno has been awarded an Ambizione Fellowship by the SNF

Flavio Bruno has been awarded an Ambizione Fellowship by the SNF

October 2015: Flavio Bruno has been awarded an Ambizione fellowship by the Swiss National Science Foundation. His project will focus on the characterization of the electronic band structure and many-body effects in strongly correlated artificial heterostructure. The objective is to demonstrate that sputtering is an excellent growth method to produce high quality oxide heterostructure with a surface…

Collapse of the Mott gap and emergence of a nodal liquid in lightly doped Sr2IrO4 – in PRL

Collapse of the Mott gap and emergence of a nodal liquid in lightly doped Sr2IrO4 – in PRL

October 2015: We report an ARPES study on the doping evolution of the Heisenberg antiferromagnet Sr2IrO4, a close analogue to underdoped cuprates (Phys. Rev. Lett. 115, 176402 (2015)). Superconductivity in underdoped cuprates emerges from an unusual electronic state characterised by nodal quasiparticles and an antinodal pseudo gap. The relation between this state and superconductivity is intensely studied…

Siobhan Mckeown Walker has received a prize at CORPES in Paris

Siobhan Mckeown Walker has received a prize at CORPES in Paris

July 2015: Siobhan Mckeown Walker has been awarded a prize for the best poster presentation at the CORPES conference in Paris, France (5-10 July 2015). CORPES is an international workshop on strong correlations and angle-resolved photoemission spectroscopy. Siobhan presented our recent ARPES work on the 2DEG at the STO (001) surface and showed the density dependence…

Carrier density control of the surface 2DEG on SrTiO3(001)

Carrier density control of the surface 2DEG on SrTiO3(001)

May 2015: Our study of the origin of the two-dimensional electron gas (2DEG) stabilized at the bare surface of SrTiO3 (001) has been accepted for publication in Advanced Materials. Using high-resolution angle resolved photoemission and core level spectroscopy we investigated the origin of the two-dimensional electron gas (2DEG) stabilized at the bare surface of SrTiO3 (001). We show…

Authorea’s APS Travel Grant Winner

Authorea’s APS Travel Grant Winner

March 2015: Alberto de la Torre wins the Authorea’s travel grant for European student attendees of the APS March meeting in San Antonio, TX. Read here an article about the 2015 travel grant winners.  

Control of a Two-Dimensional Electron Gas on SrTiO3 (111)  by Atomic Oxygen

Control of a Two-Dimensional Electron Gas on SrTiO3 (111) by Atomic Oxygen

September 2014 Our recent work on the formation and control of a 2DEG at the bare surface of (111) oriented SrTiO3 has been accepted for publication in PRL. We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO 3 . Angle resolved photoemission experiments reveal highly…

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