L. Brey
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View article: Bridging Innovation and Efficiency: The Promises and Challenges of Self-Driving Labs as Sustainable Drivers for Chemistry
Bridging Innovation and Efficiency: The Promises and Challenges of Self-Driving Labs as Sustainable Drivers for Chemistry Open
Self-driving laboratories (SDLs) are reshaping scientific discovery by combining robotics, artificial intelligence (AI), and data science to automate the full Design-Make-Test-Analyze (DMTA) cycle. This review highlights how SDLs address t…
View article: Quantum Band Structure and Topology in One Dimensional Modulated Plasmonic Crystal
Quantum Band Structure and Topology in One Dimensional Modulated Plasmonic Crystal Open
Band structures of electrons in a periodic potential are well-known to host topologies that impact their behaviors at edges and interfaces. The concept however is more general than the single-electron setting. In this work, we consider top…
View article: Many-Body Quantum Geometric Dipole
Many-Body Quantum Geometric Dipole Open
Collective excitations of many-body electron systems can carry internal structure, tied to the quantum geometry of the Hilbert space in which they are embedded. This has been shown explicitly for particle-hole-like excitations, which carry…
View article: Quantum plasmons in double layer systems
Quantum plasmons in double layer systems Open
Plasmons are fundamental excitations of metals which can be described in terms of electron dynamics, or in terms of the electromagnetic fields associated with them. In this work we develop a quantum description of plasmons in a double laye…
View article: Quantum Plasmons in Double Layer Systems
Quantum Plasmons in Double Layer Systems Open
Plasmons are fundamental excitations of metals which can be described in terms of electron dynamics, or in terms of the electromagnetic fields associated with them. In this work we develop a quantum description of plasmons in a double laye…
View article: Plasmonic transverse dipole moment in chiral fermion nanowires
Plasmonic transverse dipole moment in chiral fermion nanowires Open
Plasmons are elementary quantum excitations of conducting materials with Fermi surfaces. In two dimensions they may carry a static dipole moment that is transverse to their momentum which is quantum geometric in nature, the quantum geometr…
View article: Plasmonic Transverse Dipole Moment in Chiral Fermion Nanowires
Plasmonic Transverse Dipole Moment in Chiral Fermion Nanowires Open
Plasmons are elementary quantum excitations of conducting materials with Fermi surfaces. In two dimensions they may carry a static dipole moment that is transverse to their momentum which is quantum geometric in nature, the quantum geometr…
View article: Quantum Internal Structure of Plasmons
Quantum Internal Structure of Plasmons Open
Plasmons are usually described in terms of macroscopic quantities such as electric fields and currents. However as fundamental excitations of metals they are also quantum objects with internal structure. We demonstrate that this can induce…
View article: Quantum geometric exciton drift velocity
Quantum geometric exciton drift velocity Open
We show that the dipole moment of an exciton is uniquely determined by the quantum geometry of its eigenstates, and demonstrate its intimate connection with a quantity we call the Quantum Geometric Dipole (QGD). The QGD arises naturally in…
View article: Plasmonic Dirac Cone in Twisted Bilayer Graphene
Plasmonic Dirac Cone in Twisted Bilayer Graphene Open
We discuss plasmons of biased twisted bilayer graphene when the Fermi level lies inside the gap. The collective excitations are a network of chiral edge plasmons (CEP) entirely composed of excitations in the topological electronic edge sta…
View article: Quantum Geometric Exciton Drift Velocity
Quantum Geometric Exciton Drift Velocity Open
We show that the dipole moment of an exciton is uniquely determined by the quantum geometry of its eigenstates, and demonstrate its intimate connection with a quantity we call the Quantum Geometric Dipole (QGD). The QGD arises naturally in…
View article: Nonlocal Quantum Effects in Plasmons of Graphene Superlattices
Nonlocal Quantum Effects in Plasmons of Graphene Superlattices Open
By using a nonlocal, quantum mechanical response function we study graphene plasmons in a one-dimensional superlattice (SL) potential V_{0}cosG_{0}x. The SL introduces a quantum energy scale E_{G}∼ℏv_{F}G_{0} associated with electronic sub…
View article: Spin stiffness and domain walls in Dirac-electron mediated magnets
Spin stiffness and domain walls in Dirac-electron mediated magnets Open
[EN] Spin interactions of magnetic impurities mediated by conduction electrons is one of the most interesting and potentially useful routes to ferromagnetism in condensed matter. In recent years, such systems have received renewed attentio…
View article: Enhancement of spin-orbit coupling at manganite surfaces
Enhancement of spin-orbit coupling at manganite surfaces Open
Spin-orbit coupling in magnetic systems lacking inversion symmetry can give rise to non trivial spin textures. Magnetic thin films and heterostructures are potential candidates for the formation of skyrmions and other non-collinear spin co…
View article: Spin-orbit effects surfacing on manganites
Spin-orbit effects surfacing on manganites Open
Spin-orbit coupling in magnetic systems lacking inversion symmetry can give rise to non trivial spin textures. Magnetic thin films and heterostructures are potential candidates for the formation of skyrmions and other non-collinear spin co…
View article: Spin Stiffness and Domain Walls in Dirac-Electron Mediated Magnets
Spin Stiffness and Domain Walls in Dirac-Electron Mediated Magnets Open
Spin interactions of magnetic impurities mediated by conduction electrons is one of the most interesting and potentially useful routes to ferromagnetism in condensed matter. In recent years such systems have received renewed attention due …
View article: Charged topological solitons in zigzag graphene nanoribbons
Charged topological solitons in zigzag graphene nanoribbons Open
Graphene nanoribbons with zigzag terminated edges have a magnetic ground\nstate characterized by edge ferromagnetism and antiferromagnetic inter edge\ncoupling. This broken symmetry state is degenerate in the spin orientation and\nwe show …
View article: Surface magnetism in topological crystalline insulators
Surface magnetism in topological crystalline insulators Open
We study topological crystalline insulators doped with magnetic impurities, in which ferromagnetism at the surface lowers the electronic energy by spontaneous breaking of a crystalline symmetry. The number of energetically equivalent groun…
View article: Magnetic Skyrmionic Polarons
Magnetic Skyrmionic Polarons Open
We study a two-dimensional electron gas exchange coupled to a system of classical magnetic ions. For large Rashba spin-orbit coupling, a single electron can become self-trapped in a skyrmion spin texture self-induced in the magnetic ions s…
View article: Twisting dirac fermions: circular dichroism in bilayer graphene
Twisting dirac fermions: circular dichroism in bilayer graphene Open
Twisted bilayer graphene is a chiral system which has been recently shown to present circular dichroism. In this work we show that the origin of this optical activity is the rotation of the Dirac fermions’ helicities in the top and bottom …
View article: Plasmonics in topological insulators: Spin-charge separation and the influence of the inversion layer
Plasmonics in topological insulators: Spin-charge separation and the influence of the inversion layer Open
We demonstrate via two examples that topological insulators (TI) offer a new platform for plasmonics. Firstly, we discuss that the collective excitations of a thin slap of a TI possess spin-charge separation. This gives rise to long-lived …
View article: Magnetic phases in periodically rippled graphene
Magnetic phases in periodically rippled graphene Open
We study the effects that ripples induce on the electrical and magnetic\nproperties of graphene. The variation of the interatomic distance created by\nthe ripples translates in a modulation of the hopping parameter between carbon\natoms. A…
View article: Band structure and topological properties of graphene in a superlattice spin exchange field
Band structure and topological properties of graphene in a superlattice spin exchange field Open
We analyze the energy spectrum of graphene in the presence of spin-orbit coupling and a one-dimensional periodically modulated Zeeman field, focusing on the stability and location of Dirac points it may support. It is found that the Dirac …
View article: Spin-orbit coupling in graphene induced by adatoms with outer-shell<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>orbitals
Spin-orbit coupling in graphene induced by adatoms with outer-shellorbitals Open
Many of the exotic properties proposed to occur in graphene rely on the possibility of increasing the spin-orbit coupling (SOC). By combining analytical and numerical tight-binding calculations, in this paper we study the SOC induced by he…
View article: Transport in selectively magnetically doped topological insulator wires
Transport in selectively magnetically doped topological insulator wires Open
We study the electronic and transport properties of a topological insulator nanowire including selective magnetic doping of its surfaces. We use a model which is appropriate to describe materials like Bi2Se3 within a k·p approximation and …
View article: Electronic Conductance of Twisted Bilayer Nanoribbon Flakes
Electronic Conductance of Twisted Bilayer Nanoribbon Flakes Open
We study the transport properties of a twisted bilayer graphene flake contacted by two monolayer nanoribbons which act as leads. We analyze the conductance in terms of the spectra of the bilayer nanoribbon and the monolayer contacts. The l…
View article: Symmetries of quantum transport with Rashba spin–orbit: graphene spintronics
Symmetries of quantum transport with Rashba spin–orbit: graphene spintronics Open
The lack of some spatial symmetries in planar devices with Rashba spin–orbit interactions opens up the possibility of producing spin polarized electrical currents in the absence of external magnetic fields or magnetic impurities.