Publications by Stefan Peter Muff

Single spin-polarized Fermi surface in SrTiO3 thin films

Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber, Marco Caputo, Zheng Wang

2020

Observation of a two-dimensional electron gas at CaTiO3 film surfaces

Zoran Ristic, Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber, Zheng Wang

The two-dimensional electron gas at the surface of titanates gathered attention due to its potential to replace conventional silicon based semiconductors in the future. In this study, we investigated films of the parent perovskite CaTiO3, grown by pulsed l ...

Elsevier Science Bv2018

Topological surface state of α−Sn on InSb(001) as studied by photoemission

Stefan Peter Muff, Jan Hugo Dil

2018

Universal scattering response across the type-II Weyl semimetal phase diagram

Helmuth Berger, Philippe Bugnon, Arnaud Magrez, Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber

2018

Operando Imaging of All-Electric Spin Texture Manipulation in Ferroelectric and Multiferroic Rashba Semiconductors

Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber, Marco Caputo

American Physical Society2018

Evidence of large spin-orbit coupling effects in quasi-free-standing graphene on Pb/Ir(1 1 1)

Stefan Peter Muff, Jan Hugo Dil

2018

Spin-Resolved Electronic Response to the Phase Transition in MoTe2

Helmuth Berger, Philippe Bugnon, Arnaud Magrez, Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber, Nan Xu

2018

Influence of ferroelectric order on the surface electronic structure of BaTiO3 films studied by photoemission spectroscopy

Zoran Ristic, Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber, Zheng Wang

2018

Spin polarization in photoemission from the cuprate superconductor Bi2Sr2CaCu2O8+delta

Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber

Photoelectrons produced from the excitation of spin-degenerate states in solids can have a sizable spin polarization, which is related to the phase of interfering channels in the photoemission matrix elements. Such spin polarization can be measured by spin ...

Amer Physical Soc2017

Manipulation of the Two-Dimensional States at Titanates Surfaces studied by ARPES

Stefan Peter Muff

The transition metal oxides are known for their versatile physical properties and are therefore an active field of research towards possible new functionalities and applications. This thesis focuses on the subgroup of titanates with perovskite structure th ...

EPFL2017

Spin-resolved electronic structure of ferroelectric α-GeTe and multiferroic Ge1−Mn Te

Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber, Vladimir N. Strocov

2017

Spin Polarization and Attosecond Time Delay in Photoemission from Spin Degenerate States of Solids

Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli

After photon absorption, electrons from a dispersive band of a solid require a finite time in the photoemission process before being photoemitted as free particles, in line with recent attosecond-resolved photoemission experiments. According to the Eisenbu ...

American Physical Society2017

Spin-resolved band structure of a densely packed Pb monolayer on Si(111)

Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli

Monolayer structures of Pb on Si(111) attracted recently considerable interest as superconductivity was found in these truly two-dimensional (2D) structures. In this study, we analyzed the electronic surface band structure of the so-called striped incommen ...

Amer Physical Soc2017

Clean, cleaved surfaces of the photovoltaic perovskite

László Forró, Jeremy Luterbacher, Bálint Náfrádi, Henrik Moodysson Rønnow, Luka Ciric, Endre Horvath, Stefan Peter Muff, Jan Hugo Dil, Benjamin Pierre Le Monnier, Andrew Patton Weber, Márton Kollár

The surface of a material is not only a window into its bulk physical properties, but also hosts unique phenomena important for understanding the properties of a solid as a whole. Surface sensitive techniques, like ARPES (Angle-resolved photoemission spect ...

Nature Research2017

Sputtering-induced reemergence of the topological surface state in Bi2Se3

Stefan Peter Muff, Jan Hugo Dil, Thorsten Schmitt, Vladimir N. Strocov

We study the fate of the surface states of Bi2Se3 under disorder with strength larger than the bulk gap, caused by neon sputtering and nonmagnetic adsorbates. We find that neon sputtering introduces strong but dilute defects, which can be modeled by a unit ...

Amer Physical Soc2016

Disentangling bulk and surface Rashba effects in ferroelectric alpha-GeTe

Stefan Peter Muff, Jan Hugo Dil

Macroscopic ferroelectric order in alpha-GeTe with its noncentrosymmetric lattice structure leads to a giant Rashba spin splitting in the bulk bands due to strong spin-orbit interaction. Direct measurements of the bulk band structure using soft x-ray angle ...

Amer Physical Soc2016

Entanglement and manipulation of the magnetic and spin-orbit order in multiferroic Rashba semiconductors

Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Andrew Patton Weber

Entanglement of the spin-orbit and magnetic order in multiferroic materials bears a strong potential for engineering novel electronic and spintronic devices. Here, we explore the electron and spin structure of ferroelectric alpha-GeTe thin films doped with ...

Nature Publishing Group2016

Spin-resolved photoemission study of epitaxially grown MoSe2 and WSe2 thin films

Zahid Hussain, Stefan Peter Muff, Jan Hugo Dil, Mauro Fanciulli, Yi Zhang

Few-layer thick MoSe2 and WSe2 possess non-trivial spin textures with sizable spin splitting due to the inversion symmetry breaking embedded in the crystal structure and strong spin-orbit coupling. We report a spin-resolved photoemission study of MoSe2 and ...

Institute of Physics2016

Observation of Fermi-Arc Spin Texture in TaAs

Joël Mesot, Stefan Peter Muff, Jan Hugo Dil

We have investigated the spin texture of surface Fermi arcs in the recently discovered Weyl semimetal TaAs using spin- and angle-resolved photoemission spectroscopy. The experimental results demonstrate that the Fermi arcs are spin polarized. The measured ...

American Physical Society2015

Response of the topological surface state to surface disorder in TlBiSe2

Stefan Peter Muff, Jan Hugo Dil

Through a combination of experimental techniques we show that the topmost layer of the topological insulator TlBiSe2 as prepared by cleavage is formed by irregularly shaped Tl islands at cryogenic temperatures and by mobile Tl atoms at room temperature. No ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2015