645 citations · 3.4k across the 50 of their papers we have counts for
50 papers
Coupling of magnetic and lattice collective excitations in the 2D van der Waals antiferromagnet FePS
Kartik Panda, Itzik Kapon, Dumitru Dumcenco +3
We combine polarized infrared magneto-transmission and Faraday angle rotation measurements to map the collective excitations of the van der Waals antiferromagnet FePS. Below th…
Thoughts about boosting superconductivity
Dirk van der Marel
In a superconductor electrons form pairs despite the Coulomb repulsion as a result of an effective attractive interaction mediated by, for example phonons. In the present paper DeG…
Signatures of polarized chiral spin disproportionation in rare earth nickelates
Jiarui Li, Robert J. Green, Claribel Domínguez +12
In rare earth nickelates (RENiO), electron-lattice coupling drives a concurrent metal-to-insulator and bond disproportionation phase transition whose microscopic origin has lon…
Optical properties of LaNiO3 films tuned from compressive to tensile strain
I. Ardizzone, M. Zingl, J. Teyssier +11
Materials with strong electronic correlations host remarkable -- and technologically relevant -- phenomena such as magnetism, superconductivity and metal-insulator transitions. Har…
High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces
Weiwei Luo, Margherita Boselli, Jean-Marie Poumirol +6
Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution ope…
Detailed optical spectroscopy of the hybridization gap and the hidden order transition in high quality URuSi single crystals
N. Bachar, D. Stricker, S. Muleady +4
We present a detailed temperature and frequency dependence of the optical conductivity measured on clean high quality single crystals of URuSi of - and -plane s…
Multiband superconductivity due to the electron - LO-phonon interaction in strontium titanate and on a SrTiO3/LaAlO3 interface
S. N. Klimin, J. Tempere, J. T. Devreese +1
In strontium titanate, the Froehlich electron - LO-phonon interaction dominates the electron response and can also provide superconductivity. Because of high LO-phonon frequencies…
Suppressed magnetic circular dichroism and valley-selective magneto-absorption due to the effective mass anisotropy in bismuth
Pieter J. de Visser, Julien Levallois, Michaël K. Tran +6
We have measured the far-infrared reflectivity and Kerr angle spectra on a high-quality crystal of pure semimetallic bismuth as a function of magnetic field, from which we extract…
Magneto-optical signature of massless Kane electrons in Cd3As2
A. Akrap, M. Hakl, S. Tchoumakov +21
We report on optical reflectivity experiments performed on Cd3As2 over a broad range of photon energies and magnetic fields. The observed response clearly indicates the presence of…
BCS superconductivity near the band edge: Exact results for one and several bands
D. Valentinis, D. van der Marel, C. Berthod
We revisit the problem of a BCS superconductor in the regime where the Fermi energy is smaller than the Debye energy. This regime is relevant for low-density superconductors such a…
The fate of quasiparticles in the superconducting state
S. V. Dordevic, D. van der Marel, C. C. Homes
Quasiparticle properties in the superconducting state are masked by the superfluid and are not directly accessible to infrared spectroscopy. We show how one can use a Kramers--Kron…
Optical properties of BiTeBr and BiTeCl
A. Akrap, J. Teyssier, A. Magrez +4
We present a comparative study of the optical properties - reflectance, transmission and optical conductivity - and Raman spectra of two layered bismuth-tellurohalides BiTeBr and B…
Magnetoplasmon resonances in polycrystalline bismuth as seen via terahertz spectroscopy
Julien Levallois, Piotr Chudzinski, Jason N. Hancock +2
We report the magnetic field-dependent far-infrared reflectivity of polycrystalline bismuth. We observe four distinct absorptions that we attribute to magnetoplasmon resonances, wh…
Interface superconductivity in LaAlO-SrTiO heterostructures
S. N. Klimin, J. Tempere, J. T. Devreese +1
The interface superconductivity in LaAlO-SrTiO heterostructures reveals a non-monotonic behavior of the critical temperature as a function of the two-dimensional densit…
Infrared and Raman spectroscopy measurements of a transition in the crystal structure and a closing of the energy gap of BiTeI under pressure
M. K. Tran, J. Levallois, P. Lerch +8
BiTeI is a giant Rashba spin splitting system, in which a non-centro symmetric topological phase has recently been suggested to appear under high pressure. We investigated the opti…
Evidence for a Fermi liquid in the pseudogap phase of high-Tc cuprates
S. I. Mirzaei, D. Stricker, J. N. Hancock +9
Cuprate high-T_c superconductors on the Mott-insulating side of "optimal doping" (with respect to the highest T_c's) exhibit enigmatic behavior in the non-superconducting state. Ne…
Disentangling the electronic and phononic glue in a high-Tc superconductor
Stefano Dal Conte, Claudio Giannetti, Giacomo Coslovich +10
Unveiling the nature of the bosonic excitations that mediate the formation of Cooper pairs is a key issue for understanding unconventional superconductivity. A fundamen- tal step t…
Optical study of phonons and electronic excitations in tetragonal SrVO
J. Teyssier, R. Viennois, E. Giannini +5
We report on the optical excitation spectra in SrVO. The phonon modes are assigned and their evolution with temperature is discussed in the frame of the different phase tra…
Multi-component magneto-optical conductivity of multilayer graphene on SiC
I. Crassee, J. Levallois, D. van der Marel +3
Far-infrared diagonal and Hall conductivities of multilayer epitaxial graphene on the C-face of SiC were measured using magneto-optical absorption and Faraday rotation in magnetic…
Revealing the high-energy electronic excitations underlying the onset of high-temperature superconductivity in cuprates
Claudio Giannetti, Federico Cilento, Stefano Dal Conte +10
In strongly-correlated systems the electronic properties at the Fermi energy (EF) are intertwined with those at high energy scales. One of the pivotal challenges in the field of hi…
Surface state charge dynamics of a high-mobility three dimensional topological insulator
Jason N. Hancock, J. L. M. van Mechelen, Alexey B. Kuzmenko +6
We present a magneto-optical study of the three-dimensional topological insulator, strained HgTe using a technique which capitalizes on advantages of time-domain spectroscopy to am…
Giant Faraday rotation in single- and multilayer graphene
Iris Crassee, Julien Levallois, Andrew L. Walter +6
Optical Faraday rotation is one of the most direct and practically important manifestations of magnetically broken time-reversal symmetry. The rotation angle is proportional to the…
Measurement of magnetic excitations in the two-dimensional antiferromagnetic Sr2CuO2Cl2 insulator using resonant x-ray scattering:Evidence for extended interactions
M. Guarise, B. Dalla Piazza, M. Moretti Sala +13
Using high-resolution resonant inelastic x-ray scattering (RIXS), we performed a momentum-resolved study of magnetic excitations in the model spin-1/2 2D antiferromagnetic insulato…
Strong coupling to magnetic fluctuations in the charge dynamics of Fe-based superconductors
J. N. Hancock, S. I. Mirzaei, J. Gillett +5
We present a comprehensive comparison of the infrared charge response of two systems, characteristic of classes of the 122 pnictide (SrFe2As2) and 11 chalcogenide (Fe_1.087Te) Fe c…