A5036307789- Graphene research and applications
- Quantum and electron transport phenomena
- 2D Materials and Applications
- Topological Materials and Phenomena
- Quantum Information and Cryptography
- Advancements in Semiconductor Devices and Circuit Design
- Quantum Mechanics and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Semiconductor materials and devices
- Spectroscopy and Quantum Chemical Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Metamaterials and Metasurfaces Applications
- Carbon Nanotubes in Composites
- Organic Electronics and Photovoltaics
- Quantum Electrodynamics and Casimir Effect
- Semiconductor Quantum Structures and Devices
- Advanced Antenna and Metasurface Technologies
- Quasicrystal Structures and Properties
- MXene and MAX Phase Materials
- Molecular Junctions and Nanostructures
- Conducting polymers and applications
- Ga2O3 and related materials
- Magnetic properties of thin films
- Plasmonic and Surface Plasmon Research
- Multiferroics and related materials
IMDEA Nanoscience
2023-2025
Madrid Institute for Advanced Studies
2023-2025
Wuhan University
2018-2024
University of Science and Technology of China
2020
Universitat Autònoma de Barcelona
2014-2019
Jinan University
2012-2014
Nanjing University of Aeronautics and Astronautics
2013
Abstract A properly strained graphene monolayer or bilayer is expected to harbour periodic pseudo-magnetic fields with high symmetry, yet date, a convincing demonstration of such has been lacking, especially for graphene. Here, we report definitive experimental proof the existence large-area, fields, as manifested by vortex lattices in commensurability moiré patterns low-angle twisted The are strong enough confine massive Dirac electrons into circularly localized pseudo-Landau levels,...
Twisted bilayer graphene (TBG) has taken the spotlight in condensed matter community since discovery of correlated phases at so-called magic angle. Interestingly, role a substrate on electronic properties TBG not been completely elucidated. Up to now, most theoretical works carried out order understand this effect have done using continuum models. In work, we gone one step ahead and studied heterostructures hBN an atomistic tight-binding model together with semi-classical molecular dynamics...
Experiments conducted on two-dimensional twisted materials have revealed a plethora of moiré patterns with different forms and shapes. The formation these is usually attributed to the presence small strains in samples, which typically arise during their fabrication. In this paper we find that superlattice structure such systems actually depends crucially interplay between twist strain. For composed honeycomb lattices, show can lead practically any geometry, even if each lattice only slightly...
Theoretical and experimental studies have verified the existence of “magic angles” in twisted bilayer graphene, where rotation angle between layers gives rise to flat bands consequently exotic correlated phases. Recently, magic-angle phenomena been predicted reported other graphene systems, for instance, multilayers with alternating twist angles trilayers identical consecutive layers. In this paper, we present a comprehensive theoretical study on general systems. Using continuum model chiral...
Rydberg excitons, the solid-state counterparts of atoms, have sparked considerable interest in harnessing their quantum application potentials, whereas a major challenge is realizing spatial confinement and manipulation. Lately, rise two-dimensional moir\'e superlattices with highly tunable periodic potentials provides possible pathway. Here, we experimentally demonstrate this capability through observation excitons (XRM), which are trapped monolayer semiconductor WSe2 adjacent to twisted...
Ultraflatbands that have been theoretically and experimentally detected in a bunch of van der Waals stacked materials showing some peculiar properties, for instance, highly localized electronic states enhanced electron-electron interactions. In this Letter, using an accurate tight-binding model, we study the formation evolution ultraflatbands transition metal dichalcogenides (TMDCs) under low rotation angles. We find that, unlike twisted bilayer graphene, exist TMDCs almost any small twist...
The recent observed anomalous Hall effect in magic angle twisted bilayer graphene (TBG) aligned to hexagonal boron nitride (hBN) and unconventional ferroelectricity Bernal sandwiched by hBN present a new platform tune the correlated properties systems. In these graphene-based moir\'e superlattices, substrate plays an important role. this paper, we analyze effects of on band structure TBG. By means atomistic tight-binding model calculate electronic TBG suspended encapsulated with hBN....
Twisted graphene multilayers have been recently demonstrated to share several correlation-driven behaviors with twisted bilayer graphene. In general, the van Hove singularities (VHSs) can be used as a proxy of tendency for correlated behaviors. this paper, we adopt an atomistic method by combining tight-binding semiclassical molecular dynamics investigate electronic structures trilayer (TTG) two independent twist angles. The angles lead interference moir\'e patterns forming variety...
Motivated by the recent experimental detection of superconductivity in Bernal bilayer (AB) and rhombohedral trilayer (ABC) graphene, we study emergence multilayer graphene based on a Kohn-Luttinger (KL)-like mechanism which pairing glue is screened Coulomb interaction. We find that electronic interactions alone can drive AB ABC with critical temperatures good agreement experimentally observed ones, allowing us to further predict from ABA ABAB tetralayer ABCA graphene. By comparing ($T_c$)...
Ultraflat bands have already been detected in twisted bilayer graphene and transition-metal dichalcogenides, which provide a platform to investigate strong correlations. In this paper, the electronic properties of trilayer molybdenum disulfide (TTM) are investigated via an accurate tight-binding Hamiltonian. We find that highest valence derived from $\mathrm{\ensuremath{\Gamma}}$-point constituent monolayer, they exhibit graphenelike dispersion or become isolated flat dependent on starting...
The relentless pursuit of band structure engineering continues to be a fundamental aspect in solid-state research. Here, we meticulously construct an artificial kagome potential generate and control multiple Dirac bands graphene. This unique high-order harbors natural multiperiodic components, enabling the reconstruction structures through different contributions. As result, each characterized by distinct dispersions, shift energy at velocities response variation potential. Thereby, observe...
In the emerging world of twisted bilayer structures, possible configurations are limitless, which enables a rich landscape electronic properties. this paper, we focus on transition metal dichalcogenides (TMDCs) and study their properties by means an accurate tight-binding model. We build structures with different angles find that so-called flat bands emerge when twist angle is sufficiently tiny (smaller than $7.{3}^{\ensuremath{\circ}}$). Interestingly, band gap can be tuned up to 5% (107...
Twisted bilayer graphene with tiny rotation angles have drawn significant attention due to the observation of unconventional superconducting and correlated insulating behaviors. In this paper, we employ a full tight-binding model investigate collective excitations in twisted near magic angle. The polarization function is obtained from propagation method without diagonalization Hamiltonian matrix. With atomic relaxation considered simulation, both damped undamped plasmon modes are discovered...
Vanadium pentoxide (V 2 O 5 ) was inserted between the donor layer and anode as a hole‐extracting nanolayer. Compared with devices without layer, short‐circuit current density ( J SC ), open‐circuit voltage V OC fill factor (FF), power conversion efficiency (PCE) of rubrene/C 70 ‐based heterojunction solar cells 3 nm nanolayer are enhanced by 99%, 73%, 20%, 310%, respectively. We found that interlayer can effectively suppress contact resistance increase hole transport capability. The...
In two-dimensional small-angle twisted bilayers, van der Waals (vdW) interlayer interaction introduces an atomic-scale reconstruction, which consists of a moiré-periodic network local subdegree lattice rotations. However, real-space measurement the rotation requires extremely high spatial resolution, is outstanding challenge in experiment. Here, topmost small-period graphene moiré pattern introduced as magnifying lens to magnify sub-Angstrom distortions bilayer (TBG) by about 2 orders...
Abstract Dodecagonal bilayer graphene quasicrystal has 12-fold rotational order but lacks translational symmetry which prevents the application of band theory. In this paper, we study electronic and optical properties with large-scale tight-binding calculations involving more than ten million atoms. We propose a series periodic approximants reproduce accurately within finite unit cell. By utilizing band-unfolding method on smallest approximant only 2702 atoms, effective structure is derived....
Twist-controlled moiré superlattices (MSs) have emerged as a versatile platform for realizing artificial systems with complex electronic spectra. The combination of Bernal-stacked bilayer graphene (BLG) and hexagonal boron nitride (hBN) can give rise to an interesting MS, which has recently featured set unexpected behaviors, such unconventional ferroelectricity the ratchet effect. Yet, understanding properties BLG/hBN MS has, at present, remained fairly limited. Here, we combine...
Without access to the full quantum state, modeling dissipation in an open system requires approximations. The physical soundness of such approximations relies on using realistic microscopic models that satisfy completely positive dynamical maps. Here we present approach based use Bohmian conditional wave function that, by construction, ensures a map for either Markovian or non-Markovian scenarios while allowing implementation sources. Our is applied compute current-voltage characteristic...
Twisted bilayer transition metal dichalcogenides are ideal platforms to study flat-band phenomena. In this paper, we investigate plasmons in the hole-doped twisted ${\mathrm{MoS}}_{2}$ (tb-${\mathrm{MoS}}_{2}$) by employing a full tight-binding model and random phase approximation. When considering lattice relaxations tb-${\mathrm{MoS}}_{2}$, flat band is not separated from remote valence bands, which makes contribution of interband transitions transforming plasmon dispersion energy...