Publications (28)
Distinguishing the gapped and Weyl semimetal scenario in ZrTe: insights from an effective two-band model
Z. Rukelj, C. C. Homes, M. Orlita +1
Here we study the static and dynamic transport properties of a low energy two-band model proposed previously in E. Martino et al. [PRL 122, 217402 (2019), arXiv:1905.00280], with a…
Optical conductivity of layered topological semimetal TaNiTe
Jakov BudiÄ, Serena Nasrallah, D. Santos-Cottin +9
We present an infrared spectroscopy study of the layered topological semimetal TaNiTe, a material with a quasi-one-dimensional structure and strong in-plane anisotropy. Despite…
Addressing Shape and Extent of Weyl cones in TaAs by Landau level spectroscopy
David Santos-Cottin, Jan Wyzula, Florian Le Mardelé +7
Tantalum arsenide, TaAs, is a prime example of a topological semimetal with two types of Weyl nodes, W1 and W2, whose bulk signatures have proven elusive. We apply Landau level spe…
Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45
Christopher C. Homes, Ana Akrap, Jinsheng Wen +4
The complex optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45 with Tc=14K have been examined over a wide frequency range for light polarized in the Fe-Te(Se…
Preferential out-of-plane conduction and quasi-one-dimensional electronic states in layered 1T-TaS2
Edoardo Martino, Andrea Pisoni, Luka ÄiriÄ +9
Layered transition metal dichalcogenides (TMDs) are commonly classified as quasi-two-dimensional materials, meaning that their electronic structure closely resembles that of an ind…
Unidirectional Kondo scattering in layered NbS2
Edoardo Martino, Carsten Putzke, Markus König +13
Crystalline defects can modify quantum interactions in solids, causing unintuitive, even favourable, properties such as quantum Hall effect or superconducting vortex pinning. Here…
Non-uniform carrier density in CdAs evidenced by optical spectroscopy
I. Crassee, E. Martino, C. C. Homes +13
We report the detailed optical properties of CdAs crystals in a wide parameter space: temperature, magnetic field, carrier concentration and crystal orientation. We investi…
Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity
D. Santos-Cottin, E. Martino, F. Le Mardele +5
Molybdenum ditelluride, MoTe2, is a versatile material where the topological phase can be readily tuned by manipulating the associated structural phase transition. The fine details…
Structural phase transition and bandgap control through mechanical deformation in layered semiconductors 1T-ZrX2 (X = S, Se)
Edoardo Martino, David Santos-Cottin, Florian Le Mardele +10
Applying elastic deformation can tune a material physical properties locally and reversibly. Spatially modulated lattice deformation can create a bandgap gradient, favouring photo-…
Optical conductivity of the type-II Weyl semimetal TaIrTe
F. Le Mardelé, D. Santos-Cottin, E. Martino +7
TaIrTe is an example of a candidate Weyl type-II semimetal with a minimal possible number of Weyl nodes. Four nodes are reported to exist a single plane in -space. The exist…
ATP-induced reconfiguration of the micro-viscoelasticity of cardiac and skeletal myosin solutions
Pablo DomÃnguez-GarcÃa, Jose R. Pinto, Ana Akrap +1
We study the high-frequency micro-mechanical response of suspensions composed by cardiac and skeletal muscle myosin by optical trapping interferometry. We observe that in low ionic…
Magneto-optical response of magnetic semiconductors EuCd2X2 (X= P, As, Sb)
S. Nasrallah, D. Santos-Cottin, F. Le Mardele +16
In this study, we identify EuCd2X2 (for X = P, As, Sb) as a series of magnetic semiconductors. We examine how the band gap of the series responds to X changing from phosphorus (P),…
Pressure dependence of the superconducting transition temperature in CYb and CCa
Robert P. Smith, Anna Kusmartseva, Yuen T. C. Ko +7
We have studied the evolution, with hydrostatic pressure, of the recently discovered superconductivity in the graphite intercalation compounds CYb and CCa. We present press…
Landau level spectroscopy in current solid state physics
Ana Akrap, Milan Orlita
Landau level spectroscopy plays an important role in modern condensed-matter physics. In this technique, electrons in a solid are subjected to quantizing magnetic fields and probed…
Micro-mechanical response and power-law exponents from the longitudinal fluctuations of F-actin solutions
Pablo DomÃnguez-GarcÃa, Jose R. Pinto, Ana Akrap +1
We investigate the local fluctuations of filamentous actin (F-actin), with focus on the skeletal thin filament, using single-particle optical trapping interferometry. This experime…
Persistent antiferromagnetic order in heavily overdoped CaLaFeAs
Edoardo Martino, Maja D. Bachmann, Lidia Rossi +7
In the CaLaFeAs (112) family of pnictide superconductors, we have investigated a highly overdoped composition (x = 0.56), prepared by high-pressure, high-temperatur…
Synthesis of Murunskite Single Crystals: A Bridge Between Cuprates and Pnictides
Davor Tolj, Trpimir IvÅ¡iÄ, Ivica ŽivkoviÄ +10
Numerous contemporary investigations in condensed matter physics are devoted to high temperature (high- ) cuprate superconductors. Despite its unique effulgence among research…
Two-dimensional conical dispersion in ZrTe5 evidenced by optical spectroscopy
E. Martino, I. Crassee, G. Eguchi +8
Zirconium pentatelluride was recently reported to be a 3D Dirac semimetal, with a single conical band, located at the center of the Brillouin zone. The cone's lack of protection by…
EuCdAs: a magnetic semiconductor
D. Santos-Cottin, I. Mohelský, J. Wyzula +18
EuCdAs is now widely accepted as a topological semimetal in which a Weyl phase is induced by an external magnetic field. We challenge this view through firm experimental ev…
Characterization of two electronic subsystems in cuprates through optical conductivity
C. M. N. Kumar, Ana Akrap, Chris C. Homes +6
Understanding the physical properties of unconventional superconductors as well as of other correlated materials presents a formidable challenge. Their unusual evolution with dopin…
Optical properties of Bi2Te2Se at ambient and high pressure
Ana Akrap, Michael Tran, Alberto Ubaldini +5
The temperature dependence of the complex optical properties of the three-dimensional topological insulator Bi2Te2Se is reported for light polarized in the a-b planes at ambient pr…
Manifestation of the spin textures in the thermopower of MnSi
Stevan ArsenijeviÄ, Cedomir Petrovic, László Forró +1
To identify possible spin texture contributions to thermoelectric transport, we present a detailed temperature and pressure dependence of thermopower in MnSi, as well as a low-…
Bi2Te_xSe_y series studied by resistivity and thermopower
Ana Akrap, Alberto Ubaldini, Enrico Giannini +1
We study the detailed temperature and composition dependence of the resistivity, , and thermopower, , for a series of layered bismuth chalcogenides BiTeSe$…
Carrier concentrations and optical conductivity of a band-inverted semimetal in two and three dimensions
Zoran Rukelj, Ana Akrap
Here we study the single-particle, electronic transport and optical properties of a gapped system described by a simple two-band Hamiltonian with inverted valence bands. We analyze…
Magnetic freeze-out and anomalous Hall effect in ZrTe
Adrien Gourgout, Maxime Leroux, Jean-Loup Smirr +10
The ultra-quantum limit is achieved when a magnetic field confines an electron gas in its lowest spin-polarised Landau level. Here we show that in this limit, electron doped ZrTe$_…
Probing intraband excitations in ZrTe: a high-pressure infrared and transport study
D. Santos-Cottin, M. Padlewski, E. Martino +12
Zirconium pentatetelluride, ZrTe5, shows remarkable sensitivity to hydrostatic pressure. In this work we address the high-pressure transport and optical properties of this compound…
Vibrational anomalies in AFeAs (ACa, Sr, and Ba) single crystals
C. C. Homes, Y. M. Dai, Ana Akrap +2
The detailed behavior of the in-plane infrared-active vibrational modes has been determined in AFeAs (ACa, Sr, and Ba) above and below the structural and magnetic tr…
Interlayer interactions reshape charge-density wave through electronic elasticity in 4H-TaS
Carolina A. Marques, Martha Rösler, Berk Zengin +7
Incommensurate charge-density waves (CDWs) in layered quantum materials frequently exhibit widely varying ordering wave vectors, even among nominally identical samples, obscuring t…