A5026470713- 2D Materials and Applications
- Graphene research and applications
- Quantum and electron transport phenomena
- Perovskite Materials and Applications
- Topological Materials and Phenomena
- MXene and MAX Phase Materials
- Semiconductor Quantum Structures and Devices
- Molecular Junctions and Nanostructures
- Chalcogenide Semiconductor Thin Films
- Spectroscopy and Quantum Chemical Studies
- Quantum Computing Algorithms and Architecture
- Quantum Dots Synthesis And Properties
- Physics of Superconductivity and Magnetism
- Nanocluster Synthesis and Applications
- Rare-earth and actinide compounds
- Nanowire Synthesis and Applications
- Photonic and Optical Devices
- Advanced Semiconductor Detectors and Materials
- Strong Light-Matter Interactions
- Nonlinear Optical Materials Studies
- Advanced Physical and Chemical Molecular Interactions
- Electronic and Structural Properties of Oxides
- Multiferroics and related materials
- Diamond and Carbon-based Materials Research
- Surface and Thin Film Phenomena
Universidad Nacional Autónoma de México
2021-2024
Universidad Autónoma de la Ciudad de México
2024
University of Manchester
2017-2019
Henry Royce Institute
2017-2019
Universidade de São Paulo
2014-2017
Ohio University
2012-2014
Geometrical moir\'e patterns, generic for almost aligned bilayers of two-dimensional crystals with similar lattice structure but slightly different constants, lead to zone folding and miniband formation electronic states. Here, we show that superlattice (mSL) effects in $\mathrm{MoSe}{}_{2}/\mathrm{WS}{}_{2}$ $\mathrm{MoTe}{}_{2}/\mathrm{MoSe}{}_{2}$ heterobilayers feature alignment the band edges are enhanced by resonant interlayer hybridization, anticipate features twisted homobilayers...
We have recently shown [Phys. Rev. B {\bf 89}, 165314 (2014)] that a non--interacting quantum dot coupled to one--dimensional topological superconductor and normal leads can sustain Majorana mode even when the is expected be empty, \emph{i.e.}, energy level far above Fermi of he leads. This due bound state wire leaking into dot. Here we extend this previous work by investigating low--temperature transport through an {\it interacting} connected source drain side--coupled wire. explore...
Abstract Hybridisation of electronic bands two-dimensional materials, assembled into twistronic heterostructures, enables one to tune their optoelectronic properties by selecting conditions for resonant interlayer hybridisation. Resonant hybridisation qualitatively modifies the excitons in such transforming these optically active modes superposition states and intralayer excitons. For MoSe 2 /WSe strong hybridization both single particle excitonic can occur via tunnelling. Here we use...
Lattice reconstruction in twisted transition-metal dichalcogenide (TMD) bilayers gives rise to piezo- and ferroelectric moir\'e potentials for electrons holes, as well a modulation of the hybridisation across bilayer. Here, we develop hybrid $\mathbf{k}\cdot \mathbf{p}$ tight-binding models describe holes relevant valleys TMD homobilayers with parallel (P) anti-parallel (AP) orientations monolayer unit cells. We apply these superlattice effects WSe${}_2$ bilayers, conjunction microscopic...
We present theoretical results for the radiative rates and doping-dependent photoluminescence spectrum of interlayer excitonic complexes localized by donor impurities in MoSe$_2$/WSe$_2$ twisted heterobilayers, supported quantum Monte Carlo calculations binding energies wave-function overlap integrals. For closely aligned layers, decay is made possible momentum spread complexes' wave functions, resulting few $\mu$s$^{-1}$ rates. strongly misaligned short-range interaction between carriers...
We present a density functional theory parametrized hybrid k$\cdot$p tight binding model for electronic properties of atomically thin films transition-metal dichalcogenides, 2H-$MX_2$ ($M$=Mo, W; $X$=S, Se). use this to analyze intersubband transitions in $p$- and $n$-doped $2{\rm H}-MX_2$ predict the line shapes excitations, determined by subband-dependent two-dimensional electron hole masses, as well excitation lifetimes due emission absorption optical phonons. find that spectra...
Transition-metal dichalcogenide heterostructures exhibit moir\'e patterns that spatially modulate the electronic structure across material's plane. For certain material pairs, this modulation acts as a potential landscape with deep, trigonally symmetric wells capable of localizing interlayer excitons, forming periodic arrays quantum emitters. Here, we study these localized exciton states and their optical properties. By numerically solving two-body problem for an interacting electron-hole...
Abstract Due to their unique 2D nature, charge carriers in semiconducting transition metal dichalcogenides (TMDs) exhibit strong unscreened Coulomb interactions and sensitivity defects impurities. The versatility of van der Waals layer stacking allows spatially separating electrons holes between different TMD layers with staggered band structure, yielding interlayer few-body excitonic complexes whose nature is still debated. Here we combine quantum Monte Carlo calculations spectrally...
We study the effects of a low concentration adatoms or single vacancies in linear--response transport properties otherwise clean graphene. These impurities were treated as localized orbitals, and for each type two cases with distinct coupling symmetries studied. For adatoms, we considered top- hollow-site adsorbates (TOP HS). vacancies, studied impurity formation by soft bond reconstruction (REC), well more symmetric case charge accumulation unreconstructed (VAC). Our results indicate that...
Graphene's electronic structure can be fundamentally altered when a substrate- or adatom-induced Kekul\'e superlattice couples the valley and isospin degrees of freedom. Here, we show that band Kekul\'e-textured graphene re-engineered through layer stacking. We predict family bilayers exhibit structures with up to six valleys, room-temperature Dirac quasiparticles whose masses tuned electrostatically. Fermi velocities half as large in pristine put this system strongly coupled regime, where...
We report on the theoretical electronic spectra of twisted phosphorene bilayers exhibiting moir\'e patterns, as computed by means a continuous approximation to superlattice Hamiltonian. Our model is constructed interpolating between effective $\mathrm{\ensuremath{\Gamma}}$-point conduction- and valence-band Hamiltonians for different stacking configurations approximately realized across supercell, formulated symmetry grounds. predict realization three distinct regimes electrons holes at...
Localized magnetic moments have been predicted to develop in graphene samples with vacancies or adsorbates. The interplay between such impurities and graphene's Dirac quasiparticles leads remarkable many-body phenomena, which have, so far, proved elusive experimental efforts. In this article we study the thermodynamic, spectral, transport signatures of quantum criticality Kondo physics a dilute ensemble atomic graphene. We consider adatoms that either break preserve ${C}_{3v}$ inversion...
We study the electronic transport through a spin-1 molecule in which mechanical stretching produces magnetic anisotropy. In this type of device, vibron mode along axis will couple naturally to molecular spin. consider single vibrational and find that electron-vibron interaction induces an effective correction anisotropy shifts ground state device toward non-Fermi liquid phase. A transition into Fermi phase could then be achieved, by means stretching, passing underscreened Kondo regime....
Abstract Bandstructure engineering using alloying is widely utilized for achieving optimized performance in modern semiconductor devices. While has been studied monolayer transition metal dichalcogenides, its application van der Waals heterostructures built from atomically thin layers largely unexplored. Here, heterobilayers made monolayers of WSe 2 (or MoSe ) and Mo x W 1 − Se alloy are fabricated nontrivial tuning the resultant bandstructure observed as a function concentration . This...
The joint effects of Kekul\'e lattice distortions and Rashba-type spin-orbit coupling on the electronic properties graphene are explored. We modeled position dependence Rashba energy term in a manner that allows its seamless integration into scheme introduced by Gamayun et al. [New J. Phys. 20, 023016 (2018)] to describe with distortion. Particularly for Kekul\'e-Y (Kek-Y) texture, effective low-energy Dirac Hamiltonian contains new spin-valley locking addition well-known Rashba-induced...
We present a study of the correlated transport regimes double quantum impurity system with mutual capacitive interactions. Such can be implemented by dot arrangement or and nearby point contact, independently connected sets metallic terminals. Many--body spin correlations arising within each dot--lead subsystem give rise to Kondo effect under appropriate conditions. The otherwise independent ground states may modified coupling, decisively modifying state system. analyze this coupled through...
Abstract The functional form of Coulomb interactions in the transition metal dichalcogenides (TDMs) and other van der Waals solids is critical to many their unique properties, e.g. strongly-correlated electron states, superconductivity emergent ferromagnetism. This paper presents measurements key excitonic energy levels MoSe 2 /WSe heterostructures. These are obtained from resonance Raman experiments on specific peaks only observed at excited states excitons. data used validate a model...
Twistronic assembly of 2D materials employs the twist angle between adjacent layers as a tuning parameter for designing electronic and optical properties van der Waals heterostructures. Here, we study how interlayer hybridization, weak ferroelectric charge transfer layers, piezoelectric response to deformations set valence conduction band edges across moir{é} supercell in twistronic homobilayers MoS$_2$, MoSe$_2$, WS$_2$ WSe$_2$. We show that, due lack inversion symmetry monolayer crystals,...
We study the energies and optical spectra of excitons in twisted bilayers anisotropic van der Waals semiconductors exhibiting moir\'e patterns, taking phosphorene as a case study. Leveraging scale separation between length exciton Bohr radii, we introduce continuous model for Wannier that incorporates spatial variation their binding energies. Our calculations reveal dimensionality crossover states, driven by combined dispersion potential anisotropies, from quantum dot lattices at twist...