75 citations · 335 across the 20 of their papers we have counts for
21 papers
TopTimeNet: Topologically-assisted time-series classification model
Sharareh Sayyad, Sophia Bazzi
Distinguishing periodic from chaotic dynamics in a time series is a fundamental challenge in both physics and engineering. Yet, end-to-end learned architectures must discover both…
Converting non-Hermitian degeneracies of any order: Hierarchies of exceptional points and degeneracy manifolds
Grigory A. Starkov, Sharareh Sayyad
The emergence of various types of degeneracies plays a crucial role in optimizing and engineering different physical phenomena in non-Hermitian physics. In our work, we focus on th…
Characterizing all non-Hermitian degeneracies using algebraic approaches: Defectiveness and asymptotic behavior
Sharareh Sayyad, Grigory A. Starkov
The presence of degeneracies plays a crucial role in describing the behavior of non-Hermitian (NH) systems. In these systems, there are two key types of degeneracies: -bolical d…
Mie resonances in optical trapping: Their role in kinematics and back-action
Sharareh Sayyad, Gerd Leuchs, Vsevolod Salakhutdinov
The heating rate plays a crucial role in the decoherence of the harmonic motion of an optically levitated nanoparticle. The values of this rate vary depending on both the scatterin…
Transfer learning from Hermitian to non-Hermitian quantum many-body physics
Sharareh Sayyad, Jose L. Lado
Identifying phase boundaries of interacting systems is one of the key steps to understanding quantum many-body models. The development of various numerical and analytical methods h…
Non-Hermitian chiral anomalies in interacting systems
Sharareh Sayyad
The emergence of chiral anomaly entails various fascinating phenomena such as anomalous quantum Hall effect and chiral magnetic effect in different branches of (non-)Hermitian phys…
Topological phase diagrams of exactly solvable non-Hermitian interacting Kitaev chains
Sharareh Sayyad, Jose L. Lado
Many-body interactions give rise to the appearance of exotic phases in Hermitian physics. Despite their importance, many-body effects remain an open problem in non-Hermitian physic…
Digital Discovery of 100 diverse Quantum Experiments with PyTheus
Carlos Ruiz-Gonzalez, Sören Arlt, Jan Petermann +6
Photons are the physical system of choice for performing experimental tests of the foundations of quantum mechanics. Furthermore, photonic quantum technology is a main player in th…
Protection of all nondefective twofold degeneracies by anti-unitary symmetries in non-Hermitian systems
Sharareh Sayyad
Non-Hermitian degeneracies are classified as defective and nondefective exceptional points~(EP). While in defective EPs, both eigenvalues and eigenenergies coalesce, nondefective E…
Symmetry-protected exceptional and nodal points in non-Hermitian systems
Sharareh Sayyad, Marcus Stalhammar, Lukas Rodland +1
One of the unique features of non-Hermitian~(NH) systems is the appearance of non-Hermitian degeneracies known as exceptional points~(EPs). The extensively studied defective EPs oc…
Realizing exceptional points of any order in the presence of symmetry
Sharareh Sayyad, Flore K. Kunst
Exceptional points~(EPs) appear as degeneracies in the spectrum of non-Hermitian matrices at which the eigenvectors coalesce. In general, an EP of order may find room to emerge…
Nematicity-enhanced superconductivity in systems with a non-Fermi liquid behavior
Sharareh Sayyad, Motoharu Kitatani, Abolhassan Vaezi +1
We explore the interplay between nematicity~(spontaneous breaking of the sixfold rotational symmetry), superconductivity, and non-Fermi liquid behavior in partially flat-band model…
Non-Hermitian chiral anomalies
Sharareh Sayyad, Julia D. Hannukainen, Adolfo G. Grushin
The chiral anomaly underlies a broad number of phenomena, from enhanced electronic transport in topological metals to anomalous currents in the quark-gluon plasma. The discovery of…
Suppression of second-harmonic generation from linear bands in the topological multifold semimetal RhSi
Baozhu Lu, Sharareh Sayyad, Miguel Ángel Sánchez-MartÍnez +4
Recent experiments in the topological Weyl semimetal TaAs have observed record-breaking second-harmonic generation, a non-linear optical response at generated by an incoming l…
Entanglement Spectrum Crossings Reveal non-Hermitian Dynamical Topology
Sharareh Sayyad, Jinlong Yu, Adolfo G. Grushin +1
The development of non-Hermitian topological band theory has led to observations of novel topological phenomena in effectively classical, driven and dissipative systems. However, f…
SO(4) FLEX+DMFT formalism with SU(2)SU(2)-symmetric impurity solver for superconductivity in the repulsive Hubbard model
Sharareh Sayyad, Naoto Tsuji, Massimo Capone +1
Here we have developed a FLEX+DMFT formalism, where the symmetry properties of the system are incorporated by constructing a SO(4) generalization of the conventional fluctuation-ex…
Pairing and non-Fermi liquid behavior in partially flat-band systems
Sharareh Sayyad, Edwin W. Huang, Motoharu Kitatani +4
While multiband systems are usually considered for flat-band physics, here we study one-band models that have flat portions in the dispersion to explore correlation effects in the…
Momentum-dependent relaxation dynamics of the doped repulsive Hubbard model
Sharareh Sayyad, Naoto Tsuji, Abolhassan Vaezi +3
We study the dynamical behavior of doped electronic systems subject to a global ramp of the repulsive Hubbard interaction. We start with formulating a real-time generalization of t…
A comparative study of nonequilibrium insulator-to-metal transitions in electron-phonon systems
Sharareh Sayyad, Rok Zitko, Hugo U. R. Strand +2
We study equilibrium and nonequilibrium properties of electron-phonon systems described by the Hubbard-Holstein model using the dynamical mean-field theory. In equilibrium, we benc…
Slow down of the electronic relaxation close to the Mott transition
Sharareh Sayyad, Martin Eckstein
We investigate the time-dependent reformation of the quasiparticle peak in a correlated metal near the Mott transition, after the system is quenched into a hot electron state and e…
Coexistence of excited polarons and metastable delocalized states in photo-induced metals
Sharareh Sayyad, Martin Eckstein
We study how polaronic states form as a function of time due to strong electron-phonon coupling, starting from a hot electron distribution which is representative of a photo-induce…