329 citations · 1.6k across the 26 of their papers we have counts for
26 papers
Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in CoTe2
Atasi Chakraborty, Jun Fujii, Chia-Nung Kuo +4
We present CoTe2 as a new type-II Dirac semimetal supporting Lorentz symmetry violating Dirac fermions in the vicinity of the Fermi energy. By combining first principle ab-initio c…
Discovery of a magnetic Dirac system with large intrinsic non-linear Hall effect
Federico Mazzola, Barun Ghosh, Jun Fujii +9
Magnetic materials exhibiting topological Dirac fermions are attracting significant attention for their promising technological potential in spintronics. In these systems, the comb…
Collective plasmonic modes in the chiral multifold fermionic material CoSi
Debasis Dutta, Barun Ghosh, Bahadur Singh +4
Plasmonics in topological semimetals offers exciting opportunities for fundamental physics exploration as well as for technological applications. Here, we investigate plasmons in t…
Photonic Topological Transitions and Epsilon-Near-Zero Surface Plasmons in Type-II Dirac Semimetal NiTe
Carlo Rizza, Debasis Dutta, Barun Ghosh +8
Compared to artificial metamaterials, where nano-fabrication complexities and finite-size inclusions can hamper the desired electromagnetic response, several natural materials like…
Magnetic Topological Semimetal Phase with Electronic Correlation Enhancement in SmSbTe
Krishna Pandey, Debashis Mondal, John William Villanova +14
The ZrSiS family of compounds hosts various exotic quantum phenomena due to the presence of both topological nonsymmorphic Dirac fermions and nodal-line fermions. In this material…
Low-energy type-II Dirac fermions and spin-polarized topological surface states in transition-metal dichalcogenide NiTe
Barun Ghosh, Debashis Mondal, Chia-Nung Kuo +6
Using spin- and angle- resolved photoemission spectroscopy (spin-ARPES) together with calculations, we demonstrate the existence of a type-II Dirac semimetal stat…
A novel undamped gapless plasmon mode in tilted type-II Dirac semimetal
Krishanu Sadhukhan, Antonio Politano, Amit Agarwal
We predict the existence of a novel long-lived gapless plasmon mode in a type-II Dirac semimetal (DSM). This gapless mode arises from the out-of-phase oscillations of the density f…
Optoelectronic devices, plasmonics and photonics with topological insulators
Antonio Politano, Leonardo Viti, Miriam S. Vitiello
Topological insulators are innovative materials with semiconducting bulk together with surface states forming a Dirac cone, which ensure metallic conduction in the surface plane. T…
Liquid-phase exfoliated indium-selenide flakes and their application in hydrogen evolution reaction
Elisa Petroni, Emanuele Lago, Sebastiano Bellani +12
Single- and few-layered InSe flakes are produced by the liquid-phase exfoliation of beta-InSe single crystals in 2-propanol, obtaining stable dispersions with a concentration as hi…
Black phosphorus nanodevices at terahertz frequencies: photodetectors and future challenges
Leonardo Viti, Antonio Politano, Miriam Serena Vitiello
The discovery of graphene triggered a rapid rise of unexplored two-dimensional materials and heterostructures having optoelectronic and photonics properties that can be tailored on…
Near-field terahertz probes with room-temperature nanodetectors for subwavelength resolution imaging
Oleg Mitrofanov, Leonardo Viti, Enrico Dardanis +5
Near-field imaging with terahertz (THz) waves is emerging as a powerful technique for fundamental research in photonics and across physical and life sciences. Spatial resolution be…
Thermoelectric terahertz photodetectors based on selenium-doped black phosphorus flakes
Leonardo Viti, Antonio Politano, Kai Zhang +1
Chemical doping of bulk black phosphorus is a well-recognized way to reduce surface oxidation and degradation. Here, we report on the fabrication of terahertz frequency detectors c…
Tunable surface plasmons in Weyl semimetals TaAs and NbAs
Gennaro Chiarello, Johannes Hofmann, Zhilin Li +5
By means of high-resolution electron energy loss spectroscopy, we investigate the low-energy excitation spectrum of transition-metal monopnictides hosting Weyl fermions. We observe…
Broadband excitation spectrum of bulk crystals and thin layers of PtTe
Barun Ghosh, Francesca Alessandro, Marilena Zappia +8
We explore the broadband excitation spectrum of bulk PtTe using electron energy loss spectroscopy and density functional theory. In addition to infrared modes related to intrab…
Heterostructured hBN-BP-hBN Nanodetectors at THz Frequencies
Leonardo Viti, Jin Hu, Dominique Coquillat +4
Artificial semiconductor heterostructures played a pivotal role in modern electronic and photonic technologies, providing a highly effective mean for the manipulation and control o…
Black-Phosphorus Terahertz Photodetectors
Leonardo Viti, Jin Hu, Dominique Coquillat +4
The discovery of graphene and the related fascinating capabilities have triggered an unprecedented interest in inorganic two-dimensional (2D) materials. Despite the impressive impa…
The role of surface chemical reactivity in the stability of electronic nanodevices based on two-dimensional materials "beyond graphene" and topological insulators
A. Politano, M. S. Vitiello, L. Viti +2
Here, we examine the influence of surface chemical reactivity toward ambient gases on the performance of nanodevices based on two-dimensional materials "beyond graphene" and novel…
Plasmonics with two-dimensional semiconductors "beyond graphene": from basic research to technological applications
Amit Agarwal, Miriam S. Vitiello, Leonardo Viti +2
In this minireview, we explore the main features and the prospect of plasmonics with two-dimensional semiconductors. Plasmonic modes in each class of van der Waals semiconductors h…
Probing topological insulators surface states via plasma-wave Terahertz detection
Leonardo Viti, Dominique Coquillat, Antonio Politano +7
Topological insulators (TIs) represent a novel quantum state of matter, characterized by edge or surface-states, showing up on the topological character of the bulk wave functions.…
Unusually strong lateral interaction in the CO overlayer in phosphorene-based systems
Antonio Politano, Miriam Serena Vitiello, Leonardo Viti +5
By means of vibrational spectroscopy and density functional theory (DFT), we investigate CO adsorption on phosphorene-based systems. We find stable CO adsorption at room temperatur…
Effect of moiré superlattice reconstruction in the electronic excitation spectrum of graphene-metal heterostructures
Antonio Politano, Guus J. Slotman, Rafael Roldán +4
We have studied the electronic excitation spectrum in periodically rippled graphene on Ru(0001) and flat, commensurate graphene on Ni(111) by means of high-resolution electron ener…
Spectroscopic investigations of phonons in epitaxial graphene
Antonio Politano
The interaction of graphene with metallic substrates reveals phenomena and properties of great relevance for applications in nanotechnology. In this review, the vibrational charact…
Emergence of a ZO Kohn anomaly in quasi-freestanding epitaxial graphene
Antonio Politano, Fernando de Juan, Gennaro Chiarello +1
In neutral graphene, two prominent cusps known as Kohn anomalies are found in the phonon dispersion of the highest optical phonon at (LO branch) and (TO branch), reflec…
Symmetries and selection rules in the measurement of the phonon spectrum of graphene and related materials
Fernando de Juan, Antonio Politano, Gennaro Chiarello +1
When the phonon spectrum of a material is measured in a scattering experiment, selection rules preclude the observation of phonons that are odd under reflection by the scattering p…