Avraham Klein
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View article: The Smearing of Quasi‐Particles: Signatures in the Entanglement Entropy of Excited Many‐Particle Systems
The Smearing of Quasi‐Particles: Signatures in the Entanglement Entropy of Excited Many‐Particle Systems Open
The entanglement spectrum serves as a powerful tool for probing the structure and dynamics of quantum many‐body systems, revealing key information about symmetry, topology, and excitations. While the entanglement entropy (EE) of ground sta…
View article: Microscopic origin of the nematoelastic coupling and dynamics of hybridized collective nematic-phonon excitations
Microscopic origin of the nematoelastic coupling and dynamics of hybridized collective nematic-phonon excitations Open
Electronically driven nematic order breaks the rotational symmetry of a system, e.g., through a Pomeranchuk instability of the Fermi surface, with a concomitant distortion of the lattice. As a result, in a metal, the nematic collective mod…
View article: Strong coupling theory of superconductivity and ferroelectric quantum criticality in metallic SrTiO3
Strong coupling theory of superconductivity and ferroelectric quantum criticality in metallic SrTiO3 Open
Superconductivity in doped SrTiO3 has remained an enduring mystery for over 50 years. The material’s status as a “quantum" ferroelectric metal, characterized by a soft polar mode, suggests that quantum criticality could play a pivotal role…
View article: Intertwined geometries in collective modes of two-dimensional Dirac fermions
Intertwined geometries in collective modes of two-dimensional Dirac fermions Open
It is well known that the time-dependent response of a correlated system can be inferred from its spectral correlation functions. As a textbook example, the zero-sound collective modes of a Fermi liquid appear as poles of its particle-hole…
View article: Microscopic origin of the nemato-elastic coupling and dynamics of hybridized collective nematic-phonon excitations
Microscopic origin of the nemato-elastic coupling and dynamics of hybridized collective nematic-phonon excitations Open
Electronically-driven nematic order breaks the rotational symmetry of a system, e.g., through a Pomeranchuk instability of the Fermi surface, with a concomitant distortion of the lattice. As a result, in a metal, the nematic collective mod…
View article: Electronic spin susceptibility in metallic strontium titanate
Electronic spin susceptibility in metallic strontium titanate Open
Metallic strontium titanate (SrTiO3) is known to have both normal-state and superconducting properties that strongly vary over a wide range of charge carrier densities, but the complex interplay between lattice and electronic degrees of fr…
View article: The Smearing of Quasi-Particles: Signatures in the Entanglement Entropy of Excited Many-Particle Systems
The Smearing of Quasi-Particles: Signatures in the Entanglement Entropy of Excited Many-Particle Systems Open
The entanglement spectrum serves as a powerful tool for probing the structure and dynamics of quantum many-body systems, revealing key information about symmetry, topology, and excitations. While the entanglement entropy (EE) of ground sta…
View article: Strong Coupling Theory of Superconductivity and Ferroelectric Quantum Criticality in metallic SrTiO$_3$
Strong Coupling Theory of Superconductivity and Ferroelectric Quantum Criticality in metallic SrTiO$_3$ Open
Superconductivity in doped SrTiO$_3$ has remained an enduring mystery for over 50 years. The material's status as a ``quantum" ferroelectric metal, characterized by a soft polar mode, suggests that quantum criticality could play a pivotal …
View article: Singlet, triplet, and mixed all-to-all pairing states emerging from incoherent fermions
Singlet, triplet, and mixed all-to-all pairing states emerging from incoherent fermions Open
The electron-electron and electron-phonon coupling in complex materials can be more complicated than simple density-density interactions, involving intertwined dynamics of spin, charge, and spatial symmetries. This motivates studying unive…
View article: Multiferroicity in plastically deformed SrTiO3
Multiferroicity in plastically deformed SrTiO3 Open
Quantum materials have a fascinating tendency to manifest novel and unexpected electronic states upon proper manipulation. Ideally, such manipulation should induce strong and irreversible changes and lead to new relevant length scales. Pla…
View article: How viscous bubbles collapse: Topological and symmetry-breaking instabilities in curvature-driven hydrodynamics
How viscous bubbles collapse: Topological and symmetry-breaking instabilities in curvature-driven hydrodynamics Open
The duality between deformations of elastic bodies and noninertial flows in viscous liquids has been a guiding principle in decades of research. However, this duality is broken when a spheroidal or other doubly curved liquid film is sudden…
View article: Electronic spin susceptibility in metallic strontium titanate
Electronic spin susceptibility in metallic strontium titanate Open
Metallic strontium titanate (SrTiO$_3$) is known to have both normal-state and superconducting properties that vary strongly over a wide range of charge carrier densities. This indicates the importance of nonlinear dynamics, and has hinder…
View article: Singlet, triplet, and mixed all-to-all pairing states emerging from incoherent fermions
Singlet, triplet, and mixed all-to-all pairing states emerging from incoherent fermions Open
The electron-electron and electron-phonon coupling in complex materials can be more complicated than simple density-density interactions, involving intertwined dynamics of spin, charge, and spatial symmetries. This motivates studying unive…
View article: Multiferroicity in plastically deformed SrTiO$_3$
Multiferroicity in plastically deformed SrTiO$_3$ Open
A major challenge in the development of quantum technologies is to induce additional types of ferroic orders into materials that exhibit other useful quantum properties. Various techniques have been applied to this end, such as elastically…
View article: Theory of criticality for quantum ferroelectric metals
Theory of criticality for quantum ferroelectric metals Open
A variety of compounds, for example, doped paraelectrics and polar metals, exhibit both ferroelectricity and correlated electronic phenomena such as low-density superconductivity and anomalous transport. Characterizing such properties is t…
View article: Synergetic Ferroelectricity and Superconductivity in Zero-Density Dirac Semimetals near Quantum Criticality
Synergetic Ferroelectricity and Superconductivity in Zero-Density Dirac Semimetals near Quantum Criticality Open
We study superconductivity in a three-dimensional zero-density Dirac semimetal in proximity to a ferroelectric quantum critical point. We find that the interplay of criticality, inversion-symmetry breaking, and Dirac dispersion gives rise …
View article: Defect-induced electronic smectic state at the surface of nematic materials
Defect-induced electronic smectic state at the surface of nematic materials Open
Due to the intertwining between electronic nematic and elastic degrees of freedom, lattice defects and structural inhomogeneities commonly found in crystals can have a significant impact on the electronic properties of nematic materials. H…
View article: A theory of criticality for quantum ferroelectric metals
A theory of criticality for quantum ferroelectric metals Open
A variety of compounds, for example doped paraelectrics and polar metals, exhibit both ferroelectricity and correlated electronic phenomena such as low-density superconductivity and anomalous transport. Characterizing such properties is ti…
View article: Chiral to Nematic Crossover in the Superconducting State of 4Hb-TaS$_2$
Chiral to Nematic Crossover in the Superconducting State of 4Hb-TaS$_2$ Open
Most superconductors have an isotropic, single component order parameter, and are well described by the BCS theory for superconductivity. Unconventional, multiple components superconductors are exceptionally rare and are much less understo…
View article: How viscous bubbles collapse: topological and symmetry-breaking instabilities in curvature-driven hydrodynamics
How viscous bubbles collapse: topological and symmetry-breaking instabilities in curvature-driven hydrodynamics Open
The duality between deformations of elastic bodies and non-inertial flows in viscous liquids has been a guiding principle in decades of research. However, this duality is broken when a spheroidal or other doubly-curved liquid film is sudde…
View article: Dynamical exponent of a quantum critical itinerant ferromagnet: A Monte Carlo study
Dynamical exponent of a quantum critical itinerant ferromagnet: A Monte Carlo study Open
We consider the effect of the coupling between 2D quantum rotors near an XY ferromagnetic quantum critical point and spins of itinerant fermions. We analyze how this coupling affects the dynamics of rotors and the self-energy of fermions.A…
View article: Defect-induced electronic smectic state at the surface of nematic materials
Defect-induced electronic smectic state at the surface of nematic materials Open
Due to the intertwining between electronic nematic and elastic degrees of freedom, lattice defects and structural inhomogeneities commonly found in crystals can have a significant impact on the electronic properties of nematic materials. H…
View article: Synergetic ferroelectricity and superconductivity in zero-density Dirac semimetals near quantum criticality
Synergetic ferroelectricity and superconductivity in zero-density Dirac semimetals near quantum criticality Open
We study superconductivity in a three-dimensional zero-density Dirac semimetal in proximity to a ferroelectric quantum critical point. We find that the interplay of criticality, inversion-symmetry breaking, and Dirac dispersion gives rise …
View article: Pseudogap and superconductivity emerging from quantum magnetic fluctuations: a Monte Carlo study
Pseudogap and superconductivity emerging from quantum magnetic fluctuations: a Monte Carlo study Open
The origin of the pseudogap behavior, found in many high-$T_c$ superconductors, remains one of the greatest puzzles in condensed matter physics. One possible mechanism is fermionic incoherence, which near a quantum critical point allows pa…
View article: Enhanced superconductivity in plastically deformed strontium titanate
Enhanced superconductivity in plastically deformed strontium titanate Open
The properties of quantum materials are commonly tuned using experimental variables such as pressure, magnetic field and doping. Here we explore a different approach: irreversible, plastic deformation of single crystals. We show for the su…
View article: Normal State Properties of Quantum Critical Metals at Finite Temperature
Normal State Properties of Quantum Critical Metals at Finite Temperature Open
We study the effects of finite temperature on normal state properties of a metal near a quantum critical point to an antiferromagnetic or Ising-nematic state. At T=0, bosonic and fermionic self-energies are traditionally computed within El…