68 citations · 146 across the 16 of their papers we have counts for
17 papers
Disorder-Tailored Delocalization
Yeongjun Kim, Supriyo Ghosh, Sergej Flach
We derive disorder fields tailored by the details of a choice of a delocalized wave function. We first investigate the unidirectional Hatano-Nelson chain and its localization prope…
Nematic Phase Transitions in 1D Flat Band Condensates
Yeongjun Kim, Oleg I. Utesov, Alexei Andreanov +2
We investigate the ground-state properties of one-dimensional Gross-Pitaevskii flat-band lattices which are parametrized through their compact localized state (CLS) amplitudes. We…
Synchronization-induced flat bands in driven-dissipative dimer-waveguide chains
A. N. Osipov, I. G. Savenko, Sergej Flach +1
Flat bands in driven-dissipative systems offer a route to engineer strongly localized, long-lived excitations, yet their selective population via incoherent pumping remains an open…
Progress on artificial flat band systems: classifying, perturbing, applying
Carlo Danieli, Sergej Flach
We highlight recent progress in the study of artificial flat band systems with a threefold focus. First, we discuss single-particle flat band physics, which has advanced through th…
Spectral Topology and Delocalization in Disordered Hatano-Nelson Chains
Supriyo Ghosh, Sergej Flach
The unidirectional Hatano-Nelson chain serves as the fundamental non-Hermitian building block of the Su-Schrieffer-Heeger (SSH) model. We investigate its Anderson localization prop…
Compact localized currents in flat bands with broken time-reversal symmetry
Rohit Kishan Ray, Carlo Danieli, Alexei Andreanov +1
We develop a systematic framework for constructing all-bands-flat (ABF) lattice Hamiltonians that explicitly break time-reversal symmetry (TRS). By threading magnetic flux through…
Real space decay of flat band projectors from compact localized states
Yeongjun Kim, Sergej Flach, Alexei Andreanov
Flatbands (FB) with compact localized eigenstates (CLS) fall into three main categories, controlled by the algebraic properties of the CLS set: orthogonal, linearly independent, li…
Realization and characterization of an all-bands-flat electrical lattice
Noah Lape, Simon Diubenkov, L. Q. English +4
We construct an electrical all-bands-flat (ABF) lattice and experimentally generate compact localized states (CLSs) therein. The lattice is a diamond (rhombic) chain and implemente…
Mobility edges and fractal states in quasiperiodic Gross-Pitaevskii chains
Oleg I. Utesov, Yeongjun Kim, Sergej Flach
We explore properties of a Gross-Pitaevskii chain subject to an incommensurate periodic potential, i.e., a nonlinear Aubry-Andre model. We show that the condensate crucially impact…
Collective quantum phases in frustrated arrays of Josephson junctions
M. V. Fistul, O. Neyenhuys, B. Pernack +3
We study collective quantum phases and quantum phase transitions occurring in frustrated sawtooth arrays of small quantum Josephson junctions. Frustration is introduced through the…
Thermalization slowing down of weakly nonintegrable quantum spin dynamics
Budhaditya Bhattacharjee, Alexei Andreanov, Sergej Flach
We study thermalization slowing down of a quantum many-body spin system upon approach to two distinct integrability limits. Motivated by previous studies of classical systems, we i…
Flat band fine-tuning and its photonic applications
Carlo Danieli, Alexei Andreanov, Daniel Leykam +1
Flat bands - single-particle energy bands - in tight-binding networks have attracted attention due to the presence of macroscopic degeneracies and their extreme sensitivity to pert…
Trapping Hard-Core Bosons in Flatband Lattices
Sanghoon Lee, Alexei Andreanov, Tigran Sedrakyan +1
We investigate 1D and 2D cross-stitch lattices with hard-core bosons and analytically construct exact groundstates that feature macroscopic degeneracy. The construction relies on t…
Compact Discrete Breathers on Flat Band Networks
C. Danieli, A. Maluckov, S. Flach
Linear wave equations on flat band networks host compact localized eigenstates (CLS). Nonlinear wave equations on translationally invariant flat band networks can host compact disc…
Nonlinear localized flatband modes with spin-orbit coupling
G. Gligorić, A. Maluckov, Lj. Hadžievski +2
We report the coexistence and properties of stable compact localized states (CLSs) and discrete solitons (DSs) for nonlinear spinor waves on a flatband network with spin-orbit coup…
Frequency combs with weakly lasing exciton-polariton condensates
K. Rayanov, B. L. Altshuler, Y. G. Rubo +1
We predict the spontaneous modulated emission from a pair of exciton-polariton condensates due to coherent (Josephson) and dissipative coupling. We show that strong polariton-polar…
Resonant metallic states in driven quasiperiodic lattices
L. Morales-Molina, E. Doerner, C. Danieli +1
We consider a quasiperiodic Aubry-Andre (AA) model and add a weak time-periodic and spatially quasiperiodic perturbation. The undriven AA model is chosen to be well in the insulati…