133 citations · 978 across the 29 of their papers we have counts for
29 papers
Strong photogalvanic effect in Weyl materials due to magnetic resonances
Vahid Hassanzade, Vladyslav Kozii
We study the photogalvanic effect in Weyl semimetals under a magnetic field, focusing on the shift current. Using the Kubo formalism for an ideal, clean Weyl node at zero temperatu…
Robustness of the Kohn-Luttinger mechanism against symmetry breaking
Amir Dalal, Jonathan Ruhman, Vladyslav Kozii
We investigate how strongly broken spatial symmetries affect the Kohn--Luttinger (KL) mechanism, in which superconductivity emerges purely from repulsive interactions. While the or…
Nonunitary spin-triplet superconductors in Zeeman magnetic field
Wen Li, Vahid Hassanzade, Maxim Dzero +1
We study spin-triplet superconductivity with both unitary and nonunitary pairing in the presence of an external Zeeman magnetic field. Within a mean-field framework, we exactly dia…
Nonlinear Hall effect in topological Dirac semimetals in parallel magnetic field
Maxim Dzero, Maxim Khodas, Alex Levchenko +1
We compute the second-harmonic response of two-dimensional topological Dirac semimetals subjected to an external in-plane magnetic field. The quantum kinetic equation for the Wigne…
Instability of the critical Ngai's coupling and two-boson mechanism in metals
Phu Nguyen, Vladyslav Kozii
We study the properties of a Fermi liquid coupled to a quantum critical boson via the two-boson interaction known as Ngai's coupling. We find that the original quantum critical poi…
Unveiling a Hidden Percolation Transition in Monitored Clifford Circuits: Inroads from ZX-Calculus
Einat Buznach, Debanjan Chowdhury, Jonathan Ruhman
We revisit the measurement-induced phase transition (MPT) in Clifford circuits, which are both classically simulable and exhibit critical behavior widely believed to be distinct fr…
Linear magneto-conductivity as a DC probe of time-reversal symmetry breaking
Veronika Sunko, Chunxiao Liu, Marc Vila +6
Several optical experiments have shown that in magnetic materials the principal axes of response tensors can rotate in a magnetic field. Here we offer a microscopic explanation of…
Magnetic field induces giant nonlinear optical response in Weyl semimetals
Grigory Bednik, Vladyslav Kozii
We study the second-order optical response of Weyl semimetals in the presence of a magnetic field. We consider an idealized model of a perfectly linear Weyl node and use the Kubo f…
The field theory of a superconductor with repulsion
Amir Dalal, Jonathan Ruhman, Vladyslav Kozii
A superconductor emerges as a condensate of electron pairs, which bind despite their strong Coulomb repulsion. Eliashberg's theory elucidates the mechanisms enabling them to overco…
A theory of criticality for quantum ferroelectric metals
Avraham Klein, Vladyslav Kozii, Jonathan Ruhman +1
A variety of compounds, for example doped paraelectrics and polar metals, exhibit both ferroelectricity and correlated electronic phenomena such as low-density superconductivity an…
Synergetic ferroelectricity and superconductivity in zero-density Dirac semimetals near quantum criticality
Vladyslav Kozii, Avraham Klein, Rafael M. Fernandes +1
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, in…
Direct Geometric Probe of Singularities in Band Structure
Charles D. Brown, Shao-Wen Chang, Malte N. Schwarz +5
The band structure of a crystal may have points where two or more bands are degenerate in energy and where the geometry of the Bloch state manifold is singular, with consequences f…
Intrinsic anomalous Hall conductivity in a nonuniform electric field
Vladyslav Kozii, Alexander Avdoshkin, Shudan Zhong +1
We study how the intrinsic anomalous Hall conductivity is modified in two-dimensional crystals with broken time-reversal symmetry due to weak inhomogeneity of the applied electric…
Spin-triplet superconductivity from inter-valley Goldstone modes in magic-angle graphene
Vladyslav Kozii, Michael P. Zaletel, Nick Bultinck
We consider magic-angle graphene in the doping regime around charge neutrality and study the connection between a recently proposed inter-valley coherent insulator at zero doping a…
The effect of interorbital scattering on superconductivity in doped Dirac materials
David Dentelski, Vladyslav Kozii, Jonathan Ruhman
Unconventional superconductivity has been discovered in a variety of doped materials, including topological insulators, semimetals and twisted bilayers. A unifying property of thes…
Interactions remove the quantization of the chiral photocurrent at Weyl points
Alexander Avdoshkin, Vladyslav Kozii, Joel E. Moore
The chiral photocurrent or circular photogalvanic effect (CPGE) is a photocurrent that depends on the sense of circular polarization. In a disorder-free, noninteracting chiral Weyl…
Quantized Thermoelectric Hall Effect Induces Giant Power Factor in a Topological Semimetal
Fei Han, Nina Andrejevic, Thanh Nguyen +14
Thermoelectrics are promising by directly generating electricity from waste heat. However, (sub-)room-temperature thermoelectrics have been a long-standing challenge due to vanishi…
Observation of a thermoelectric Hall plateau in the extreme quantum limit
Wenjie Zhang, Peipei Wang, Brian Skinner +10
The thermoelectric Hall effect is the generation of a transverse heat current upon applying an electric field in the presence of a magnetic field. Here we demonstrate that the ther…
Thermoelectric Hall conductivity and figure of merit in Dirac/Weyl materials
Vladyslav Kozii, Brian Skinner, Liang Fu
We calculate the thermoelectric response coefficients of three-dimensional Dirac or Weyl semimetals as a function of magnetic field, temperature, and Fermi energy. We focus in part…
Superconductivity near a ferroelectric quantum critical point in ultralow-density Dirac materials
Vladyslav Kozii, Zhen Bi, Jonathan Ruhman
The experimental observation of superconductivity in doped semimetals and semiconductors, where the Fermi energy is comparable to or smaller than the characteristic phonon frequenc…
Nematic superconductivity stabilized by density wave fluctuations: Possible application to twisted bilayer graphene
Vladyslav Kozii, Hiroki Isobe, Jörn W. F. Venderbos +1
Nematic superconductors possess unconventional superconducting order parameters that spontaneously break rotational symmetry of the underlying crystal. In this work we propose a me…
Thermal plasmon resonantly enhances electron scattering in Dirac/Weyl semimetals
Vladyslav Kozii, Liang Fu
We study the inelastic scattering rate due to the Coulomb interaction in three-dimensional Dirac/Weyl semimetals at finite temperature. We show that the perturbation theory diverge…
Ferromagnetic transition in a one-dimensional spin-orbit-coupled metal and its mapping to a critical point in smectic liquid crystals
Vladyslav Kozii, Jonathan Ruhman, Liang Fu +1
We study the quantum phase transition between a paramagnetic and ferromagnetic metal in the presence of Rashba spin-orbit coupling in one dimension. Using bosonization, we analyze…
Odd-parity superconductivity near inversion breaking quantum critical point in one dimension
Jonathan Ruhman, Vladyslav Kozii, Liang Fu
We study how an inversion-breaking quantum critical point affects the ground state of a one-dimensional electronic liquid with repulsive interaction and spin-orbit coupling. We fin…