Publications (233)
Intrinsic atomic scale modulations of the superconducting gap of 2H-NbSe2
I. Guillamon, H. Suderow, F. Guinea +1
We present scanning tunneling microscopy and spectroscopy measurements at 100mK in the superconducting material 2H-NbSe2 that show well defined features in the superconducting dens…
Properties of electrons near a Van Hove singularity
M. A. H. Vozmediano, J. Gonzalez, F. Guinea +2
The Fermi surface of most hole-doped cuprates is close to a Van Hove singularity at the M point. A two-dimensional electronic system, whose Fermi surface is close to a Van Hove sin…
Integer Quantum Hall Effect in Trilayer Graphene
A. Kumar, W. Escoffier, J. M. Poumirol +7
The Integer Quantum Hall Effect (IQHE) is a distinctive phase of two-dimensional electronic systems subjected to a perpendicular magnetic field. Thus far, the IQHE has been observe…
Entanglement at the boundary of spin chains near a quantum critical point and in systems with boundary critical points
T. Stauber, F. Guinea
We analyze the entanglement properties of spins (qubits) attached to the boundary of spin chains near quantum critical points, or to dissipative environments, near a boundary criti…
Influence of external information in the minority game
M. A. R. de Cara, F. Guinea
The influence of a fixed number of agents with the same fixed behavior on the dynamics of the minority game is studied. Alternatively, the system studied can be considered the mino…
The interplay between double exchange, super-exchange, and Lifshitz localization in doped manganites
J. L. Alonso, L. A. Fernandez, F. Guinea +2
Considering the disorder caused in manganites by the substitution of Mn by Fe or Ga, we accomplish a systematic study of doped manganites begun in previous papers. To this end, a d…
Fields radiated by a nanoemitter in a graphene sheet
A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal +1
The extraordinary properties of graphene make it a very promising material for use in optoelectronics. However, this is still a nascent field, where some basic properties of the el…
Unconventional quasiparticle lifetime in graphite
J. Gonzalez, F. Guinea, M. A. H. Vozmediano
The influence of electron-electron scattering on quasiparticle lifetimes in graphite is calculated. In the limit when the Fermi surface is reduced to isolated points in the Brillou…
Momentum dependence of the spin and charge excitations in the two dimensional Hubbard model
M. P. López-Sancho, F. Guinea, J. A. Vergés +1
The low energy spin and charge excitations in the 2D Hubbard model near half filling are analyzed. The RPA spectra derived from inhomoheneous mean field textures are analyzed. Spin…
The electronic properties of graphene
A. H. Castro Neto, F. Guinea, N. M. R. Peres +2
This article reviews the basic theoretical aspects of graphene, a one atom thick allotrope of carbon, with unusual two-dimensional Dirac-like electronic excitations. The Dirac elec…
Gaps tunable by electrostatic gates in strained graphene
T. Low, F. Guinea, M. I. Katsnelson
We show that when the pseudomagnetic fields created by long wavelength deformations are appropriately coupled with a scalar electric potential, a significant energy gap can emerge…
Periodically rippled graphene: growth and spatially resolved electronic structure
A. L. Vazquez de Parga, F. Calleja, B. Borca +4
We studied the growth of an epitaxial graphene monolayer on Ru(0001). The graphene monolayer covers uniformly the Ru substrate over lateral distances larger than several microns re…
Electronic dephasing in wires due to metallic gates
F. Guinea
The dephasing effect of metallic gates on electrons moving in one quasi--one--dimensional diffusive wires is analyzed. The incomplete screening in this geometry implies that the ef…
Spin polarized current and Andreev transmission in planar superconducting-ferromagnetic Nb-Ni junctions
E. M. Gonzalez, A. Dominguez-Folgueras, F. J. Palomares +6
We have measured and modeled, using three different approaches, the tunneling current in a Nb/NbxOy/Ni planar tunnel junction. The experimental data could be fitted and the correct…
Giant atomic swirl in graphene bilayers with biaxial heterostrain
F. Mesple, N. R. Walet, G. Trambly de Laissardière +7
The study of moiré engineering started with the advent of van der Waals heterostructures in which stacking two-dimensional layers with different lattice constants leads to a moirÅ
Fixed Points of the Dissipative Hofstadter Model
E. Novais, F. Guinea, A. H. Castro Neto
The phase diagram of a dissipative particle in a periodic potential and a magnetic field is studied in the weak barrier limit and in the tight-biding regime. For the case of half f…
Marginal Fermi liquid behavior from 2d Coulomb interaction
J. Gonzalez, F. Guinea, M. A. H. Vozmediano
A full, nonperturbative renormalization group analysis of interacting electrons in a graphite layer is performed, in order to investigate the deviations from Fermi liquid theory th…
Effect of Point Defects on the Optical and Transport Properties of MoS2 and WS2
S. Yuan, R. Roldán, M. I. Katsnelson +1
Imperfections in the crystal structure, such as point defects, can strongly modify the optical and transport properties of materials. Here, we study the effect of point defects on…
Granular systems in the Coulomb blockade regime
D. P. Arovas, F. Guinea, C. Herrero +1
Disordered granular systems, at temperatures where charging effects are important, are studied, by means of an effective medium approximation. The intragrain charging energy leads…
Spin-orbit coupling assisted by flexural phonons in graphene
H. Ochoa, A. H. Castro Neto, V. I. Fal'ko +1
We analyze the couplings between spins and phonons in graphene. We present a complete analysis of the possible couplings between spins and flexural, out of plane, vibrations. From…
Synthetic electric fields and phonon damping in carbon nanotubes and graphene
F. von Oppen, F. Guinea, E. Mariani
Smoothly varying lattice strain in graphene affects the Dirac carriers through a synthetic gauge field. When the lattice strain is time dependent, as in connection with phononic ex…
Strains and pseudo-magnetic fields in circular graphene rings
Nima Abedpour, Reza Asgari, F. Guinea
We demonstrate that circular graphene ring under a shear stress displays strong pseudo-magnetic fields. We calculate the pseudo-magnetic field both from continuum elasticity theory…
Many-body effects in doped graphene on a piezoelectric substrate
D. G. González, I. Zapata, J. Schiefele +2
We investigate the many-body properties of graphene on top of a piezoelectric substrate, focusing on the interaction between the graphene electrons and the piezoelectric acoustic p…
Non Equilibrium Electronic Distribution in Single Electron Devices
N. GarcÃa, F. Guinea
The electronic distribution in devices with sufficiently small diemnsions may not be in thermal equilibrium with their surroundings. Systems where the occupancies of electronic sta…
Momentum dependence of spin-orbit interaction effects in single-layer and multi-layer transition metal dichalcogenides
R. Roldán, M. P. López-Sancho, E. Cappelluti +3
One of the main characteristics of the new family of two-dimensional crystals of semiconducting transition metal dichalcogenides (TMD) is the strong spin-orbit interaction, which m…
Edge and Surface States in the Quantum Hall Effect in Graphene
A. H. Castro Neto, F. Guinea, N. M. R. Peres
We study the integer and fractional quantum Hall effect on a honeycomb lattice at half-filling (graphene) in the presence of disorder and electron-electron interactions. We show th…
Straight cracks in dynamic brittle fracture
O. Pla, F. Guinea, E. Louis +2
We study the dynamics of cracks in brittle materials when the velocity of the crack is comparable to the sound velocity by means of lattice simulations. Inertial and damped dynamic…
The Effect of Cluster Formation on Graphene Mobility
K. M. McCreary, K. Pi, Adrian Swartz +6
We investigate the effect of gold (Au) atoms in the form of both point-like charged impurities and clusters on the transport properties of graphene. Cryogenic deposition (18 K) of…
Band structure and gaps of triangular graphene superlattices
F. Guinea, T. Low
General properties of long wavelength triangular graphene superlattice are studied. It is shown that Dirac points with and without gaps can arise at a number of high symmetry point…
Disorder and interaction effects in two dimensional graphene sheets
T. Stauber, F. Guinea, M. A. H. Vozmediano
The interplay between different types of disorder and electron-electron interactions in graphene planes is studied by means of Renormalization Group techniques. The low temperature…
Topologically Protected Zero Modes in Twisted Bilayer Graphene
R. de Gail, M. O. Goerbig, F. Guinea +2
We show that the twisted graphene bilayer can reveal unusual topological properties at low energies, as a consequence of a Dirac-point splitting. These features rely on a symmetry…
Variational approach to the excitonic phase transition in graphene
J. Sabio, F. Sols, F. Guinea
We analyze the Coulomb interacting problem in undoped graphene layers by using an excitonic variational ansatz. By minimizing the energy, we derive a gap equation which reproduces…
Hybrid Monte Carlo algorithm for the Double Exchange Model
J. L. Alonso, L. A. Fernandez, F. Guinea +2
The Hybrid Monte Carlo algorithm is adapted to the simulation of a system of classical degrees of freedom coupled to non self-interacting lattices fermions. The diagonalization of…
Electron-Electron Interactions in Graphene: Current Status and Perspectives
Valeri N. Kotov, Bruno Uchoa, Vitor M. Pereira +2
We review the problem of electron-electron interactions in graphene. Starting from the screening of long range interactions in these systems, we discuss the existence of an emergin…
Electronic susceptibilities in systems with anisotropic Fermi surfaces
S. Fratini, F. Guinea
The low temperature dependence of the spin and charge susceptibilities of an anisotropic electron system in two dimensions is analyzed. It is shown that the presence of inflection…
Piezoelectricity in monolayer hexagonal boron nitride
P. Ares, T. Cea, M. Holwill +7
Two-dimensional (2D) hexagonal boron nitride (hBN) is a wide-bandgap van der Waals crystal with a unique combination of properties, including exceptional strength, large oxidation…
Fermi Liquid Theory of a Fermi Ring
T. Stauber, N. M. R. Peres, F. Guinea +1
We study the effect of electron-electron interactions in the electronic properties of a biased graphene bilayer. This system is a semiconductor with conduction and valence bands ch…
Surface plasmon enhanced absorption and suppressed transmission in periodic arrays of graphene ribbons
A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal +1
Resonance diffraction in the periodic array of graphene micro-ribbons is theoretically studied following a recent experiment [L. Ju et al, Nature Nanotech. 6, 630 (2011)]. Systemat…
Dynamical polarization of graphene at finite doping
B. Wunsch, T. Stauber, F. Sols +1
The polarization of graphene is calculated exactly within the random phase approximation for arbitrary frequency, wave vector, and doping. At finite doping, the static susceptibili…
Electronic lifetimes in ballistic quantum dots electrostatically coupled to metallic environments
F. Guinea, R. A. Jalabert, F. Sols
We calculate the lifetime of low-energy electronic excitations in a two-dimensional quantum dot near a metallic gate. We find different behaviors depending on the relative values o…
Electron-electron interactions in graphene sheets
J. Gonzalez, F. Guinea, M. A. H. Vozmediano
The effects of the electron-electron interactions in a graphene layer are investigated. It is shown that short range couplings are irrelevant, and scale towards zero at low energie…
Local defects and ferromagnetism in graphene layers
M. A. H. Vozmediano, M. P. Lopez-Sancho, T. Stauber +1
We study the changes in the electronic structure induced by lattice defects in graphene planes. In many cases, lattice distortions give rise to localized states at the Fermi level.…
Coherence and Coulomb blockade in single electron devices: a unified treatment of interaction effects
S. Florens, P. San Jose, F. Guinea +1
We study the interplay between Coulomb blockade and the Kondo effect in quantum dots. We use a self-consistent scheme which describes mesoscopic devices in terms of a collective ph…
Learning, competition and cooperation in simple games
M. A. R. de Cara, O. Pla, F. Guinea
The minority model was introduced to study the competition between agents with limited information. It has the remarkable feature that, as the amount of information available incre…
Entanglement and dephasing of quantum dissipative systems
T. Stauber, F. Guinea
The von Neumann entropy of various quantum dissipative models is calculated in order to discuss the entanglement properties of these systems. First, integrable quantum dissipative…
Assisted hopping in the Anderson impurity model: A flow equation study
T. Stauber, F. Guinea
We investigate the effect of assisted hopping in the Anderson impurity model. We use the flow equation method, which, by means of unitary transformations, generates a sequence of H…
Quantum Hall effect in carbon nanotubes and curved graphene strips
E. Perfetto, J. Gonzalez, F. Guinea +2
We develop a long wavelength approximation in order to describe the low-energy states of carbon nanotubes in a transverse magnetic field. We show that, in the limit where the squar…
Stacking boundaries and transport in bilayer graphene
P. San-Jose, R. V. Gorbachev, A. K. Geim +2
Pristine bilayer graphene behaves in some instances as an insulator with a transport gap of a few meV. This behaviour has been interpreted as the result of an intrinsic electronic…
Transverse current current response of graphene at finite temperature, plasmons and absorption
A. Gutiérrez-Rubio, T. Stauber, F. Guinea
We calculate the linear transverse current current response function for graphene at finite temperature and chemical potential. Within the Random Phase Approximation, we then discu…
Intervalley scattering, long-range disorder, and effective time reversal symmetry breaking in graphene
A. F. Morpurgo, F. Guinea
We discuss the effect of certain types of static disorder, like that induced by curvature or topological defects, on the quantum correction to the conductivity in graphene. We find…
Coulomb blockade in graphene nanoribbons
F. Sols, F. Guinea, A. H. Castro Neto
We propose that recent transport experiments revealing the existence of an energy gap in graphene nanoribbons may be understood in terms of Coulomb blockade. Electron interactions…
Self-energy corrections to anisotropic Fermi surfaces
R. Roldan, M. P. Lopez-Sancho, F. Guinea +1
The electron-electron interactions affect the low-energy excitations of an electronic system and induce deformations of the Fermi surface. These effects are especially important in…
Spin relaxation in corrugated graphene
I. M. Vicent, H. Ochoa, F. Guinea
In graphene, out-of-plane (flexural) vibrations and static ripples imposed by the substrate relax the electron spin, intrinsically protected by mirror symmetry. We calculate the re…
Transverse transport in graphite
M. P. Lopez-Sancho, M. A. H. Vozmediano, F. Guinea
Graphite is a layered material showing a strong anisotropy. Among the unconventional properties reported by experiments, the electronic transport along the c-axis, which has direct…
Dissipation in graphene and nanotube resonators
C. Seoanez, F. Guinea, A. H. Castro Neto
Different damping mechanisms in graphene nanoresonators are studied: charges in the substrate, ohmic losses in the substrate and the graphene sheet, breaking and healing of surface…
Electrostatic interactions between graphene layers and their environment
J. Sabio, C. Seoanez, S. Fratini +3
We analyze the electrostatic interactions between a single graphene layer and a SiO susbtrate, and other materials which may exist in its environment. We obtain that the leadin…
Many body effects on - axis properties: out of plane coherence and bilayer splitting
F. Guinea, M. P. Lopez-Sancho, M. A. H. Vozmediano
The out-of-plane hopping in layered metals with strong electronic correlation is analyzed theoretically. By studying the effects of in-plane interactions on the interlayer tunnelli…
Gauge fields in graphene
M. A. H. Vozmediano, M. I. Katsnelson, F. Guinea
The physics of graphene is acting as a bridge between quantum field theory and condensed matter physics due to the special quality of the graphene quasiparticles behaving as massle…
Colloquium: Spintronics in graphene and other two-dimensional materials
A. Avsar, H. Ochoa, F. Guinea +3
After the first unequivocal demonstration of spin transport in graphene (Tombros et al., 2007), surprisingly at room temperature, it was quickly realized that this novel material w…
Electronic interactions in fullerene molecules
J. Gonzalez, F. Guinea, M. A. H. Vozmediano
We study the Coulomb interactions in fullerene molecules within a continuum formalism. The model gives rise to a renormalizable field theory, which has many similarities to standar…
Entanglement of spin chains with general boundaries and of dissipative systems
T. Stauber, F. Guinea
We analyze the entanglement properties of spins (qubits) close to the boundary of spin chains in the vicinity of a quantum critical point and show that the concurrence at the bound…
Exchange instability of the two-dimensional electron gas in semiconductor quantum wells
A. R. Goñi, U. Haboeck, C. Thomsen +4
A two-dimensional (2D) electron gas formed in a modulation-doped GaAs/AlGaAs single quantum well undergoes a first-order transition when the first excited subband is occupied with…
Spin-orbit coupling in ballistic carbon nanotubes
D. Huertas-Hernando, F. Guinea, A. Brataas
This paper has been withdrawn.
Dissipation-driven quantum phase transitions in a Tomonaga-Luttinger liquid electrostatically coupled to a metallic gate
M. A. Cazalilla, F. Sols, F. Guinea
The dissipation induced by a metallic gate on the low-energy properties of interacting 1D electron liquids is studied. As function of the distance to the gate, or the electron dens…
Charge-polarized interfacial superlattices in marginally twisted hexagonal boron nitride
C. R. Woods, P. Ares, H. Nevison-Andrews +7
When two-dimensional crystals are brought into close proximity, their interaction results in strong reconstruction of electronic spectrum and local crystal structure. Such reconstr…
Assisted hopping and interaction effects in impurity models
L. Borda, F. Guinea
We study, using Numerical Renormalization Group methods, the generalization of the Anderson impurity model where the hopping depends on the filling of the impurity. We show that th…
Dynamics of Holes and Universality Class of the Antiferromagnetic Transition in the Two Dimensional Hubbard Model
F. Guinea, E. Louis, P. Lopez-Sancho +1
The dynamics of a single hole (or electron) in the two dimensional Hubbard model is investigated. The antiferromagnetic background is described by a Nèel state, and the hopping of…
Non linear dynamics of vortices in superconductors with short coherence length
F. Guinea, Yu. Pogorelov
In superconductors where the coherence length is comparable to the Fermi wavelength, the vortex viscosity depends on the velocity of the vortex, leading to non linear equations of…
Elliot-Yafet mechanism in graphene
H. Ochoa, A. H. Castro Neto, F. Guinea
The differences between spin relaxation in graphene and in other materials are discussed. For relaxation by scattering processes, the Elliot-Yafet mechanism, the relation between t…
Edge and waveguide THz surface plasmon modes in graphene micro-ribbons
A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal +1
Surface plasmon modes supported by graphene ribbon waveguides are studied and classified. The properties of both modes with the field concentration within the ribbon area (waveguid…
Extended magic phase in twisted graphene multilayers
D. C. W. Foo, Z. Zhan, Mohammed M. Al Ezzi +3
Theoretical and experimental studies have verified the existence of ``magic angles'' in twisted bilayer graphene, where the twist between layers gives rise to flat bands and conseq…
Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps
D. Huertas-Hernando, F. Guinea, A. Brataas
A continuum model for the effective spin orbit interaction in graphene is derived from a tight-binding model which includes the and bands. We analyze the combined effects…
Instability of Anisotropic Fermi Surfaces in Two Dimensions
J. Gonzalez, F. Guinea, M. A. H. Vozmediano
The effect of strong anisotropy on the Fermi line of a system of correlated electrons is studied in two space dimensions, using renormalization group techniques. Inflection points…
Spin flip scattering in magnetic junctions
F. Guinea
Processes which flip the spin of an electron tunneling in a junction made up of magnetic electrodes are studied. It is found that: i) Magnetic impurities give a contribution which…
Effect of external conditions on the structure of scrolled graphene edges
M. M. Fogler, A. H. Castro Neto, F. Guinea
Characteristic dimensions of carbon nanoscrolls - "buckyrolls" - are calculated by analyzing the competition between elastic, van der Waals, and electrostatic energies for represen…
Localization of electronic states by fullerene charges in carbon nanotubes
J. Gonzalez, F. Guinea
We study the effects of the electrostatic interaction produced by charged fullerenes encapsulated in carbon nanotubes, showing that they are able to modify locally the electronic d…
Quantum Spin Hall Effect in Two-dimensional Crystals of Transition Metal Dichalcogenides
M. A. Cazalilla, H. Ochoa, F. Guinea
We propose to engineer time-reversal-invariant topological insulators in two-dimensional (2D) crystals of transition metal dichalcogenides (TMDCs). We note that, at low doping, sem…
Bending modes, anharmonic effects and thermal expansion coefficient in single layer and multilayer graphene
P. L. de Andres, F. Guinea, M. I. Katsnelson
We present a simple analytical approach to study anharmonic effects in single layer, bilayer, and multilayer graphene. The coupling between in plane and out of plane modes leads to…
Many body renormalization of the minimal conductivity in graphene
F. Guinea, M. I. Katsnelson
The conductance of ballistic graphene at the neutrality point is due to coherent electron tunneling between the leads, the so called pseudodiffusive regime. The conductance scales…
Electronic properties of single-layer and multilayer transition metal dichalcogenides ( Mo, W and S, Se)
R. Roldán, J. A. Silva-Guillén, M. P. López-Sancho +3
Single- and few-layer transition metal dichalcogenides have recently emerged as a new family of layered crystals with great interest, not only from the fundamental point of view, b…
Single-channel transmission in gold one-atom contacts and chains
G. Rubio-Bollinger, C. de las Heras, E. Bascones +3
We induce superconductivity by proximity effect in thin layers of gold and study the number of conduction channels which contribute to the current in one-atom contacts and atomic w…
Localized states at zigzag edges of bilayer graphene
Eduardo V. Castro, N. M. R. Peres, J. M. B. Lopes dos Santos +2
We report the existence of zero energy surface states localized at zigzag edges of bilayer graphene. Working within the tight-binding approximation we derive the analytic solution…
Strain-induced pseudo-magnetic field for novel graphene electronics
Tony Low, F. Guinea
Particular strain geometry in graphene could leads to a uniform pseudo-magnetic field of order 10T and might open up interesting applications in graphene nano-electronics. Through…
Limits on electron quality in suspended graphene due to flexural phonons
E. V. Castro, H. Ochoa, M. I. Katsnelson +5
The temperature dependence of the mobility in suspended graphene samples is investigated. In clean samples, flexural phonons become the leading scattering mechanism at temperature…
Resonant plasmonic effects in periodic graphene antidot arrays
A. Yu. Nikitin, F. Guinea, L. Martin-Moreno
We show that a graphene sheet perforated with micro- or nano-size antidots have prominent absorption resonances in the microwave and terahertz regions. These resonances correspond…
Magnetoresistance of itinerant electrons interacting with local spins
G. Gomez-Santos, S. Fratini, F. Guinea
Transport properties of itinerant electrons interacting with local spins are analyzed as function of the bandwidth, , the exchange interaction, , and the band filling, , n…
Dirac-point engineering and topological phase transitions in honeycomb optical lattices
B. Wunsch, F. Guinea, F. Sols
We study the electronic structure and the phase diagram of non-interacting fermions confined to hexagonal optical lattices. In the first part, we compare the properties of Dirac po…
Simple model of anisotropic pairing with repulsive interactions
F. Guinea
A simple tight binding model with repulsive interactions is studied. The inclusion of more than one orbital per site leads to assisted hopping effects, and, when the orbitals invol…
Gauge fields, ripples and wrinkles in graphene layers
F. Guinea, B. Horovitz, P. Le Doussal
We analyze elastic deformations of graphene sheets which lead to effective gauge fields acting on the charge carriers. Corrugations in the substrate induce stresses, which, in turn…
Linear stability analysis of the Hele-Shaw cell with lifting plates
S. -Z. Zhang, E. Louis, O. Pla +1
The first stages of finger formation in a Hele-Shaw cell with lifting plates are investigated by means of linear stability analysis. The equation of motion for the pressure field (…
Electron-electron interactions and the phase diagram of a graphene bilayer
Johan Nilsson, A. H. Castro Neto, N. M. R. Peres +1
We study the effects of long and short-range electron-electron interactions in a graphene bilayer. Using a variational wavefunction technique we show that in the presence of long-r…
Electronic states and Landau levels in graphene stacks
F. Guinea, A. H. Castro Neto, N. M. R. Peres
We analyze, within a minimal model that allows analytical calculations, the electronic structure and Landau levels of graphene multi-layers with different stacking orders. We find,…
Electron-electron interaction and charging effects in graphene quantum dots
B. Wunsch, T. Stauber, F. Guinea
We analyze charging effects in graphene quantum dots. Using a simple model, we show that, when the Fermi level is far from the neutrality point, charging effects lead to a shift in…
Low voltage conductance of small tunnel junctions
F. Guinea, M. Ueda
A discrete charge transfer in a small tunnel junction where Coulomb interactions are important can excite electron-hole pairs near the Fermi level. We use a simple model to study t…
Cloning of Dirac fermions in graphene superlattices
L. A. Ponomarenko, R. V. Gorbachev, G. L. Yu +15
Lateral superlattices have attracted major interest as this may allow one to modify spectra of two dimensional electron systems and, ultimately, create materials with tailored elec…
Density functional theory analysis of flexural modes, elastic constants, and corrugations in strained graphene
P. L. de Andres, F. Guinea, M. I. Katsnelson
Ab initio density functional theory has been used to analyze flexural modes, elastic constants, and atomic corrugations on single and bi-layer graphene. Frequencies of flexural mod…
Phase diagram and influence of defects in the double perovskites
J. L. Alonso, L. A. Fernandez, F. Guinea +2
The phase diagram of the double perovskites of the type Sr_{2-x} La_x Fe Mo O_6 is analyzed, with and without disorder due to antisites. In addition to an homogeneous half metallic…
Heterostrain rules the flat-bands in magic-angle twisted graphene layers
F. Mesple, A. Missaoui, T. Cea +5
The moiré of twisted graphene bilayers can generate flat bands in which charge carriers do not posses enough kinetic energy to escape Coulomb interactions with each other leading…
Ultrathin graphene-based membrane with precise molecular sieving and ultrafast solvent permeation
Q. Yang, Y. Su, C. Chi +10
Graphene oxide (GO) membranes continue to attract intense interest due to their unique molecular sieving properties combined with fast permeation rates. However, the membranes' use…
Dissipation due to two-level systems in nano-mechanical devices
C. Seoanez, F. Guinea, A. H. Castro Neto
We analyze the dissipation of the frequency vibrations of nano-mechanical devices. We show that the coupling between flexural modes and two-level systems leads to sub-ohmic dissipa…