Philippe Bugnon

Cette personne n’est plus à l’EPFL

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (34)

Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl)

Marco Grioni, Arnaud Magrez, Oleg Yazyev, Helmuth Berger, Alberto Crepaldi, Philippe Bugnon, Luca Moreschini, Simon Karl Moser, Gabriel Albert Autes, Jens Christian Johannsen

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 a ...

Elsevier2015

Momentum and photon energy dependence of the circular dichroic photoemission in the bulk Rashba semiconductors BiTeX (X = I, Br, Cl)

Marco Grioni, Arnaud Magrez, Oleg Yazyev, Helmuth Berger, Alberto Crepaldi, Philippe Bugnon, Gabriel Albert Autes, Luca Moreschini, Jens Christian Johannsen, Cédric Tournier-Colletta

Bulk Rashba systems BiTeX (X = I, Br, Cl) are emerging as important candidates for developing spintronics devices because of the coexistence of spin-split bulk and surface states, along with the ambipolar character of the surface charge carriers. The need ...

American Physical Society2014

Optical properties of BiTeBr and BiTeCl

Helmuth Berger, Arnaud Magrez, Philippe Bugnon, Ana Akrap, Dirk Van der Marel

We present a comparative study of the optical properties-reflectance, transmission, and optical conductivity- and Raman spectra of two layered bismuth-tellurohalides BiTeBr and BiTeCl at 300 and 5 K, for light polarized in the a-b planes. Despite different ...

Amer Physical Soc2014

Unusual Shubnikov-de Haas oscillations in BiTeCl

Helmuth Berger, Arnaud Magrez, Philippe Bugnon

We report measurements of Shubnikov-de Haas oscillations in single crystals of BiTeCl at magnetic fields up to 31 T and at temperatures as low as 0.4 K. Two oscillation frequencies were resolved at the lowest temperatures, F-1 = 65 +/- 4 T and F-2 = 156 +/ ...

Amer Physical Soc2014

Atomic and electronic structure of a Rashba p-n junction at the BiTeI surface

Marco Grioni, Oleg Yazyev, Helmuth Berger, Philippe Bugnon, Gabriel Albert Autes, Cédric Tournier-Colletta

The non-centro-symmetric semiconductor BiTeI exhibits two distinct surface terminations that support spin-split Rashba surface states. Their ambipolarity can be exploited for creating spin-polarized p-n junctions at the boundaries between domains with diff ...

American Physical Society2014

Thermal diffusivity measurements of templated nanocomposite using infrared thermography

Arnaud Magrez, Helmuth Berger, Philippe Bugnon, Manish Sharma

Electrodeposited bismuth telluride (Bi2Te3) nanowires using anodic alumina (AAO) templates show anisotropic thermal properties in a direction parallel and perpendicular to the nanowire/nanochannel axis. The present study reports thermal diffusivity measure ...

Elsevier Science Bv2014

Enhanced low-temperature thermoelectrical properties of BiTeCl grown by topotactic method

László Forró, Arnaud Magrez, Richard Gaal, Helmuth Berger, Andrea Pisoni, Philippe Bugnon, Sergiy Katrych, Ana Akrap, Jacim Jacimovic, Xavier François Mettan

We developed a topotactic strategy to grow BiTeCl single crystals. Structural characterization by means of X-ray diffraction was performed, and the high crystallinity of the material was proven. Measurements of the thermoelectrical coefficients electrical ...

Pergamon-Elsevier Science Ltd2014

Evidence of reduced surface electron-phonon scattering in the conduction band of Bi2Se3 by nonequilibrium ARPES

Klaus Kern, Marco Grioni, Helmuth Berger, Philippe Bugnon, Alberto Crepaldi, Jens Christian Johannsen

The nature of the Dirac quasiparticles in topological insulators calls for a direct investigation of the electron-phonon scattering at the surface. By comparing time-resolved ARPES measurements of the topological insulator Bi2Se3 with different probing dep ...

Amer Physical Soc2013

Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3

Klaus Kern, Marco Grioni, Helmuth Berger, Philippe Bugnon, Alberto Crepaldi

We exploit time- and angle-resolved photoemission spectroscopy to determine the evolution of the out-of-equilibrium electronic structure of the topological insulator Bi2Se3. The response of the Fermi-Dirac distribution to ultrashort IR laser pulses has bee ...

Amer Physical Soc2012

Giant Ambipolar Rashba Effect in the Semiconductor BiTeI

Klaus Kern, Marco Grioni, Oleg Yazyev, Helmuth Berger, Philippe Bugnon, Alberto Crepaldi, Gabriel Albert Autes, Luca Moreschini, Simon Karl Moser, Cédric Tournier-Colletta

We observe a giant spin-orbit splitting in the bulk and surface states of the noncentrosymmetric semiconductor BiTeI. We show that the Fermi level can be placed in the valence or in the conduction band by controlling the surface termination. In both cases, ...

Amer Physical Soc2012

Page 3 sur 4

Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl)

Marco Grioni, Arnaud Magrez, Oleg Yazyev, Helmuth Berger, Alberto Crepaldi, Philippe Bugnon, Luca Moreschini, Simon Karl Moser, Gabriel Albert Autes, Jens Christian Johannsen

Elsevier2015

Momentum and photon energy dependence of the circular dichroic photoemission in the bulk Rashba semiconductors BiTeX (X = I, Br, Cl)

Marco Grioni, Arnaud Magrez, Oleg Yazyev, Helmuth Berger, Alberto Crepaldi, Philippe Bugnon, Gabriel Albert Autes, Luca Moreschini, Jens Christian Johannsen, Cédric Tournier-Colletta

American Physical Society2014