1.1k citations · 6.3k across the 79 of their papers we have counts for
60 papers · 1 filter
Topological phases of a generalised tripartite Haldane model
Ahmed Al-kharusi, Alessandro Principi, Niels R. Walet
We present a generalised tripartite Haldane model with a complex nearest neighbour hopping parameter. The total magnetic flux through the primitive unit cell, which consists of thr…
Nonconserved Density Accumulations in Orbital Hall Transport: Insights from Linear Response Theory
Hao Sun, Alexander Kazantsev, Alessandro Principi +1
We present a linear response theory for stationary density accumulations in anomalous transport phenomena, such as the orbital Hall effect, where the transported density is odd und…
First-order effect of electron-electron interactions on the anomalous Hall conductivity of massive Dirac fermions
A. Daria Dumitriu-I., Darius-A. Deaconu, Alexander E. Kazantsev +1
We investigate the first-order correction to the anomalous Hall conductivity of 2D massive Dirac fermions arising from electron-electron interactions. In a fully gapped system in t…
Thermopower in hBN/graphene/hBN superlattices
Victor H. Guarochico-Moreira, Christopher R. Anderson, Vladimir Fal'ko +9
Thermoelectric effects are highly sensitive to the asymmetry in the density of states around the Fermi energy and can be exploited as probes of the electronic structure. We experim…
Fractal field-effect transistors: Enhanced photodetection and fractal dependent resonances
Bailey Winstanley, Alessandro Principi
We study gated field effect transistors (FETs) with fractal geometries under Dyakonov and Shur asymmetric boundary conditions, where the source and drain span the left and right ed…
Giant magnetoresistance of Dirac plasma in high-mobility graphene
Na Xin, James Lourembam, P. Kumaravadivel +12
The most recognizable feature of graphene's electronic spectrum is its Dirac point around which interesting phenomena tend to cluster. At low temperatures, the intrinsic behavior i…
Transition from acoustic plasmon to electronic sound in graphene
David Barcons Ruiz, Niels C. H. Hesp, Hanan Herzig Sheinfux +10
Fermi liquids respond differently to perturbations depending on whether their frequency is larger (collisionless regime) or smaller (hydrodynamic regime) than the inter-particle co…
Electron cooling in graphene enhanced by plasmon-hydron resonance
Xiaoqing Yu, Alessandro Principi, Klaas-Jan Tielrooij +2
Evidence is accumulating for the crucial role of a solid's free electrons in the dynamics of solid-liquid interfaces. Liquids induce electronic polarization and drive electric curr…
Non-conservation of the valley density and its implications for the observation of the valley Hall effect
Alexander Kazantsev, Amelia Mills, Eoin O'Neill +3
We show that the conservation of the valley density in multivalley insulators is broken in an unexpected way by the electric field that drives the valley Hall effect. This implies…
On the origin of Abrikosov's quantum linear magnetoresistance
Alexander Kazantsev, Alexey Berdyugin, Andre Geim +1
Compensated semimetals with Weyl spectra are predicted to exhibit unsaturated linear growth of their resistivity in quantizing magnetic fields. This so-called quantum linear magnet…
Interlayer electron-hole friction in tunable twisted bilayer graphene semimetal
D. A. Bandurin, A. Principi, I. Y. Phinney +3
Charge-neutral conducting systems represent a class of materials with unusual properties governed by electron-hole (e-h) interactions. Depending on the quasiparticles' statistics,…
Optotwistronic of bilayer graphene
Leone Di Mauro Villari, Alessandro Principi
We present a study of the nonlinear optical response of twisted bilayer graphene. We discuss the contribution of the Berry phase to the non-linearity when inversion symmetry is bro…
Ultrafast electronic heat dissipation through surface-to-bulk Coulomb coupling in quantum materials
Alessandro Principi, Klaas-Jan Tielrooij
The timescale of electronic cooling is an important parameter controlling the performance of devices based on quantum materials for optoelectronic, thermoelectric and thermal manag…
Hot carriers in graphene -- fundamentals and applications
Mathieu Massicotte, Giancarlo Soavi, Alessandro Principi +1
Hot charge carriers in graphene exhibit fascinating physical phenomena, whose understanding has improved greatly over the past decade. They have distinctly different physical prope…
Hot-Carrier Cooling in High-Quality Graphene is Intrinsically Limited by Optical Phonons
Eva A. A. Pogna, Xiaoyu Jia, Alessandro Principi +20
Many promising optoelectronic devices, such as broadband photodetectors, nonlinear frequency converters, and building blocks for data communication systems, exploit photoexcited ch…
Topological Surface-plasmon-polaritons on Corrugated Metal-dielectric Surfaces
Thomas Benjamin Smith, Coskun Kocabas, Alessandro Principi
We study topological surface-plasmon-polaritons at optical frequencies in diffraction gratings formed by bipartite corrugated metal-dielectric gratings. To do so we implement the t…
Thermal transport in compensated semimetals: a mystery explained
Mohammad Zarenia, Alessandro Principi, Giovanni Vignale
It is well known that the electronic thermal conductivity of clean compensated semimetals can be greatly enhanced over the electric conductivity by the availability of an ambipolar…
Observation of giant and tuneable thermal diffusivity of Dirac fluid at room temperature
Alexander Block, Alessandro Principi, Niels C. H. Hesp +8
Conducting materials typically exhibit either diffusive or ballistic charge transport. However, when electron-electron interactions dominate, a hydrodynamic regime with viscous cha…
Eccentric Corbino FET in magnetic field: a highly tunable photodetector
Bailey Winstanley, Henning Schomerus, Alessandro Principi
We study gated field effect transistors (FETs) with an eccentric Corbino-disk geometry, such that the drain spans its circumference while the off-center inner ring acts as a source…
Tunneling spectroscopy as a probe of fractionalization in 2D magnetic heterostructures
Matteo Carrega, Ivan J. Vera-Marun, Alessandro Principi
In this paper we develop the theory for 2D-to-2D tunneling spectroscopy aided by magnetic or quantum-order excitations, and apply it to the description of van-der-Waals heterostruc…
Emergent Non-Hermitian Edge Polarisation in an Hermitian Tight-binding Model
Thomas Benjamin Smith, Alessandro Principi
We study a bipartite Kronig-Penney model with negative Dirac-delta potentials that may be used, amongst other models, to interpret plasmon propagation in nanoparticle arrays. Such…
Control of electron-electron interaction in graphene by proximity screening
M. Kim, S. G. Xu, A. I. Berdyugin +14
Electron-electron interactions play a critical role in many condensed matter phenomena, and it is tempting to find a way to control them by changing the interactions' strength. One…
Visualizing Poiseuille flow of hydrodynamic electrons
Joseph A. Sulpizio, Lior Ella, Asaf Rozen +12
Hydrodynamics is a general description for the flow of a fluid, and is expected to hold even for fundamental particles such as electrons when inter-particle interactions dominate.…
A Bipartite Kronig-Penney Model with Dirac Potential Scatterers
Thomas Benjamin Smith, Alessandro Principi
Here we present a simple extension to the age-old Kronig-Penney model, which is made to be bipartite by varying either the scatterer separations or the potential heights. In doing…