H. A. Fertig
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View article: Striped Spin Density Wave in a Graphene/Black Phosphorous Heterostructure
Striped Spin Density Wave in a Graphene/Black Phosphorous Heterostructure Open
A bilayer formed by stacking two distinct materials creates a moiré lattice, which can serve as a platform for novel electronic phases. In this work we study a unique example of such a system: the graphene-black phosphorus heterostructure …
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: Skyrmion stripes in twisted double bilayer graphene
Skyrmion stripes in twisted double bilayer graphene Open
Two dimensional moiré systems have recently emerged as a platform in which the interplay between topology and strong correlations of electrons play out in non-trivial ways. Among these systems, twisted double bilayer graphene (TDBG) is of …
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: Phase diagram of the $ν= 2$ quantum Hall state in bilayer graphene
Phase diagram of the $ν= 2$ quantum Hall state in bilayer graphene Open
Bilayer graphene exhibits a rich phase diagram in the quantum Hall regime, arising from a multitude of internal degrees of freedom, including spin, valley, and orbital indices. The variety of fractional quantum Hall states between filling …
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: Dipolar optical plasmon in thin-film Weyl semimetals
Dipolar optical plasmon in thin-film Weyl semimetals Open
In a slab geometry with large surface-to-bulk ratio, topological surface states such as Fermi arcs for Weyl or Dirac semimetals may dominate their low-energy properties. We investigate the collective charge oscillations in such systems, fi…
View article: Experimental data for "Electric field drives Chern transition in Hofstadter bands of twisted double bilayer graphene"
Experimental data for "Electric field drives Chern transition in Hofstadter bands of twisted double bilayer graphene" Open
This experimental dataset was used in our study of "Electric field drives Chern transition in Hofstadter bands of twisted double bilayer graphene".
View article: Experimental data for "Electric field drives Chern transition in Hofstadter bands of twisted double bilayer graphene"
Experimental data for "Electric field drives Chern transition in Hofstadter bands of twisted double bilayer graphene" Open
This experimental dataset was used in our study of "Electric field drives Chern transition in Hofstadter bands of twisted double bilayer graphene".
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: Floquet-engineered topological flat bands in irradiated twisted bilayer graphene
Floquet-engineered topological flat bands in irradiated twisted bilayer graphene Open
We propose a tunable optical setup to engineer topologically nontrivial flat\nbands in twisted bilayer graphene under circularly polarized light. Using both\nanalytical and numerical calculations, we demonstrate that nearly flat bands\ncan…
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: RKKY coupling in Weyl semimetal thin films
RKKY coupling in Weyl semimetal thin films Open
We consider the effective coupling between impurity spins on surfaces of a thin-film Weyl semimetal within Ruderman-Kittel-Kasuya-Yoshida (RKKY) theory. If the spins are on the same surface, their coupling reflects the anisotropy and the s…
View article: RKKY interactions in graphene Landau levels
RKKY interactions in graphene Landau levels Open
We study Ruderman–Kittel–Kasuya–Yosida (RKKY) interactions for magnetic impurities on graphene in situations where the electronic spectrum is in the form of Landau levels. Two such situations are considered: nonuniformly strained graphene,…
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: Spin response and collective modes in simple metal dichalcogenides
Spin response and collective modes in simple metal dichalcogenides Open
Transition metal dichalcogenide (TMD) monolayers are interesting materials in\npart because of their strong spin-orbit coupling. This leads to intrinsic\nspin-splitting of opposite signs in opposite valleys, so the valleys are\nintrinsical…
View article: Quantum noise detects Floquet topological phases
Quantum noise detects Floquet topological phases Open
We study quantum noise in a nonequilibrium, periodically driven, open system attached to static leads. Using a Floquet Green's function formalism we show, both analytically and numerically, that local voltage noise spectra can detect the r…
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: 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 …