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Tunable hyperbolic Landau-level polaritons in charge-neutral graphene nanoribbon metasurfaces
Kateryna Domina, Tetiana Slipchenko, D. -H. -Minh Nguyen +4
Magnetized charge-neutral graphene supports collective hybrid electronic excitations - polaritons - which have quantum origin. In contrast to polaritons in doped graphene, which ar…
Infrared Spectroscopy for Diagnosing Superlattice Minibands in Magic-angle Twisted Bilayer Graphene
Geng Li, Roshan Krishna Kumar, Petr Stepanov +11
Twisted bilayer graphene (TBG) represents a highly tunable, strongly correlated electron system owed to its unique flat electronic bands. However, understanding the single-particle…
Electronic transport in sub-micrometric channels at the LaAlO/SrTiO interface
Margherita Boselli, Gernot Scheerer, Michele Filippone +6
Nanoscale channels realized at the conducting interface between LaAlO and SrTiO provide a perfect playground to explore the effect of dimensionality on the electronic p…
Magnetoplasmonic Enhancement of Faraday Rotation in Patterned Graphene Metasurfaces
Michele Tamagnone, Tetiana M. Slipchenko, Clara Moldovan +10
Faraday rotation is a fundamental property present in all non-reciprocal optical elements. In the THz range, graphene displays strong Faraday rotation; unfortunately, it is limited…
Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength Dependent Mapping
Nicolas Ubrig, Sanghyun Jo, Marc Philippi +4
The band structure of many semiconducting monolayer transition metal dichalcogenides (TMDs) possesses two degenerate valleys, with equal and opposite Berry curvature. It has been p…
Electrically controlled terahertz magneto-optical phenomena in continuous and patterned graphene
Jean-Marie Poumirol, Peter Q. Liu, Tetiana M. Slipchenko +4
The magnetic circular dichroism and the Faraday rotation are the fundamental phenomena of great practical importance arising from the breaking of the time reversal symmetry by a ma…
Effect of uniaxial strain on the optical Drude scattering in graphene
Manisha Chhikara, Iaroslav Gaponenko, Patrycja Paruch +1
Graphene is a mechanically robust 2D material promising for flexible optoelectronic applications. However, its electromagnetic properties under strain are experimentally poorly und…
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…
Surface transport and band gap structure of exfoliated 2H-MoTe crystals
Ignacio Gutiérrez Lezama, Alberto Ubaldini, Maria Longobardi +4
Semiconducting transition metal dichalcogenides (TMDs) have emerged as materials that can be used to realize two-dimensional (2D) crystals possessing rather unique transport and op…
Scanning photocurrent microscopy reveals electron-hole asymmetry in ionic liquid-gated WS2 transistors
Nicolas Ubrig, Sanghyun Jo, Helmuth Berger +2
We perform scanning photocurrent microscopy on WS2 ionic liquid-gated field effect transistors exhibiting high-quality ambipolar transport. By properly biasing the gate electrode w…
Mono- and Bilayer WS2 Light-Emitting Transistors
Sanghyun Jo, Nicolas Ubrig, Helmuth Berger +2
We have realized ambipolar ionic liquid gated field-effect transistors based on WS2 mono- and bilayers, and investigated their opto-electronic response. A thorough characterization…
Strong plasmon reflection at nanometer-size gaps in monolayer graphene on SiC
Jianing Chen, Maxim L. Nesterov, Alexey Yu. Nikitin +12
We employ tip-enhanced infrared near-field microscopy to study the plasmonic properties of epitaxial quasi-free-standing monolayer graphene on silicon carbide. The near-field image…
Fabry-Perot enhanced Faraday rotation in graphene
Nicolas Ubrig, Iris Crassee, Julien Levallois +5
We demonstrate that giant Faraday rotation in graphene in the terahertz range due to the cyclotron resonance is further increased by constructive Fabry-Perot interference in the su…
Charged-phonon theory and Fano effect in the optical spectroscopy of bilayer graphene
E. Cappelluti, L. Benfatto, M. Manzardo +1
Since their discovery, graphene-based systems represent an exceptional playground to explore the emergence of peculiar quantum effects. The present paper focuses on the anomalous a…
Infrared spectroscopy of hole doped ABA-stacked trilayer graphene
N. Ubrig, P. Blake, D. van der Marel +1
Using infrared spectroscopy, we investigate bottom gated ABA-stacked trilayer graphene subject to an additional environment-induced p-type doping. We find that the Slonczewski-Weis…
Classical to quantum crossover of the cyclotron resonance in graphene: A study of the strength of intraband absorption
M. Orlita, I. Crassee, C. Faugeras +7
We report on absolute magneto-transmission experiments on highly-doped quasi-free-standing epitaxial graphene targeting the classical-to-quantum crossover of the cyclotron resonanc…
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…