643 citations · 6.1k across the 133 of their papers we have counts for
16 papers · 1 filter
Quantum criticality and optical conductivity in a two-valley system
Yasha Gindikin, Songci Li, Alex Levchenko +3
We demonstrate that the optical conductivity of a Fermi liquid (FL) in the absence of umklapp scattering is dramatically affected by the topology of the Fermi surface (FS). Specifi…
Coulomb drag and heat transfer in strange metals
A. L. Chudnovskiy, Alex Levchenko, Alex Kamenev
We address Coulomb drag and near-field heat transfer in a double-layer system of incoherent metals. Each layer is modeled by an array of tunnel-coupled SYK dots with random inter-l…
Superconductor--Insulator Transition in a non-Fermi Liquid
A. L. Chudnovskiy, Alex Kamenev
We present a model of a strongly correlated system with a non-Fermi liquid high temperature phase. Its ground state undergoes an insulator to superconductor quantum phase transitio…
One-dimensional scattering of two-dimensional fermions near quantum criticality
Dimitri Pimenov, Alex Kamenev, Andrey V. Chubukov
Forward and backscattering play an exceptional role in the physics of two-dimensional interacting fermions. In a Fermi liquid, both give rise to a non-analytic form o…
Nature of Protected Zero Energy States in Penrose Quasicrystals
Ezra Day-Roberts, Rafael M. Fernandes, Alex Kamenev
The electronic spectrum of the Penrose rhombus quasicrystal exhibits a macroscopic fraction of exactly degenerate zero energy states. In contrast to other bipartite quasicrystals,…
SYK Superconductivity: Quantum Kuramoto and Generalized Richardson Models
Hanteng Wang, A. L. Chudnovskiy, Alexander Gorsky +1
Sachdev-Ye-Kitaev (SYK) model has emerged as a new paradigm of the non-Fermi-liquid behavior. Here we investigate a possibility of having a superconducting off-diagonal long-range…
Multidimensional dark space and its underlying symmetries: towards dissipation-protected qubits
Raul A. Santos, Fernando Iemini, Alex Kamenev +1
Quantum systems are always subject to interactions with an environment, typically resulting in decoherence and distortion of quantum correlations. It has been recently shown that a…
Helical spin liquid in a triangular XXZ magnet from Chern-Simons theory
Tigran A. Sedrakyan, Roderich Moessner, Alex Kamenev
We propose a finite-temperature phase diagram for the 2D spin- antiferromagnet on the triangular lattice. Our analysis, based on a composite fermion representa…
SYK non Fermi Liquid Correlations in Nanoscopic Quantum Transport
Alexander Altland, Dmitry Bagrets, Alex Kamenev
Electronic transport in nano-structures, such as long molecules or 2D exfoliated flakes, often goes through a nearly degenerate set of single-particle orbitals. Here we show that i…
Quantum criticality of granular SYK matter
Alexander Altland, Dmitry Bagrets, Alex Kamenev
We consider granular quantum matter defined by Sachdev-Ye-Kitaev (SYK) dots coupled via random one-body hopping. Within the framework of Schwarzian field theory, we identify a zero…
Power-law out of time order correlation functions in the SYK model
Dmitry Bagrets, Alexander Altland, Alex Kamenev
We evaluate the finite temperature partition sum and correlation functions of the Sachdev-Ye-Kitaev (SYK) model. Starting from a recently proposed mapping of the SYK model onto Lio…
Sachdev-Ye-Kitaev Model as Liouville Quantum Mechanics
Dmitry Bagrets, Alexander Altland, Alex Kamenev
We show that the proper inclusion of soft reparameterization modes in the Sachdev-Ye-Kitaev model of randomly interacting Majorana fermions reduces its long-time behavior to th…
Topological spin ordering via Chern-Simons superconductivity
Tigran A. Sedrakyan, Victor M. Galitski, Alex Kamenev
We use the Chern-Simons (CS) fermion representation of s =1/2 spin operators to construct topological, long-range magnetically ordered states of interacting two-dimensional (2D) qu…
Spontaneous formation of a non-uniform chiral spin liquid in moat-band lattices
Tigran A. Sedrakyan, Leonid I. Glazman, Alex Kamenev
A number of lattices exhibit moat-like band structures, i.e. a band with infinitely degenerate energy minima attained along a closed line in the Brillouin zone. If such a lattice i…
Correlation functions of the BC Calogero-Sutherland model
Shinsuke M. Nishigaki, Dimitri M. Gangardt, Alex Kamenev
The BC-type Calogero-Sutherland model (CSM) is an integrable extension of the ordinary A-type CSM that possesses a reflection symmetry point. The BC-CSM is related to the chiral cl…
Replica Treatment of the Calogero-Sutherland Model
Dimitry M. Gangardt, Alex Kamenev
Employing Forrester-Ha method of Jack polynomials, we derive an integral identity connecting certain N-fold coordinate average of the Calogero-Sutherland model with the n-fold repl…