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Jan Hugo Dil

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Publications associées (63)

Determination of the time scale of photoemission from the measurement of spin polarization

Jan Hugo Dil, Mauro Fanciulli

The Eisenbud-Wigner-Smith (EWS) time delay of photoemission depends on the phase term of the matrix element describing the transition. Because of an interference process between partial channels, the photoelectrons acquire a spin polarization which is also ...

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

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

Direct measurement of the bulk spin structure of noncentrosymmetric BiTeCl

Stefan Peter Muff, Jan Hugo Dil

A strong spin-orbit interaction leads to a Rashba-type splitting of the bulk bands of BiTeCl, which results in toroidal Fermi surfaces with distinct spin structures depending on the chemical potential. Here, we present spin-and angle-resolved photoelectron ...

American Physical Society2015

Unconventional transformation of spin Dirac phase across a topological quantum phase transition

Jan Hugo Dil, Chang Liu

The topology of a topological material can be encoded in its surface states. These surface states can only be removed by a bulk topological quantum phase transition into a trivial phase. Here we use photoemission spectroscopy to image the formation of prot ...

Nature Publishing Group2015

Concept of a multichannel spin-resolving electron analyzer based on Mott scattering

Jan Hugo Dil, Vladimir N. Strocov

The concept of a multichannel electron spin detector based on optical imaging principles and Mott scattering (iMott) is presented. A multichannel electron image produced by a standard angle-resolving (photo) electron analyzer or microscope is re-imaged by ...

International Union of Crystallography2015

Rashba-type spin splitting and spin interference of the Cu(111) surface state at room temperature

Jan Hugo Dil

We report on the measurement of the Rashba-type spin splitting of the Shockley surface state on Cu(1 1 1) by spin- and angle-resolved photoemission at room temperature. Along the spatial direction expected for a Rashba-type effect the measured spin splitti ...

Elsevier2015

Observation of correlated spin-orbit order in a strongly anisotropic quantum wire system

Stefan Peter Muff, Jan Hugo Dil

Quantum wires with spin-orbit coupling provide a unique opportunity to simultaneously control the coupling strength and the screened Coulomb interactions where new exotic phases of matter can be explored. Here we report on the observation of an exotic spin ...

Nature Publishing Group2015

Exotic Kondo crossover in a wide temperature region in the topological Kondo insulator SmB6 revealed by high-resolution ARPES

Joël Mesot, Kazimierz Conder, Jan Hugo Dil

Temperature dependence of the electronic structure of SmB6 is studied by high-resolution angle-resolved photoemission spectroscopy (ARPES) down to 1 K. We demonstrate that there is no essential difference for the dispersions of the surface states below and ...

Amer Physical Soc2014

Giant spin splitting of the two-dimensional electron gas at the surface of SrTiO3

Jan Hugo Dil

Two-dimensional electron gases (2DEGs) forming at the interfaces of transition metal oxides(1-3) exhibit a range of properties, including tunable insulator-superconductor-metal transitions(4-6), large magnetoresistance(7), coexisting ferromagnetism and sup ...

Nature Publishing Group2014

Direct observation of the spin texture in SmB6 as evidence of the topological Kondo insulator

Joël Mesot, Kazimierz Conder, Stefan Peter Muff, Jan Hugo Dil

Topological Kondo insulators have been proposed as a new class of topological insulators in which non-trivial surface states reside in the bulk Kondo band gap at low temperature due to strong spin-orbit coupling. In contrast to other three-dimensional topo ...

Nature Publishing Group2014

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