Rubem Mondaini
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View article: Onset of quantum chaos and ergodicity in spin systems with highly degenerate Hilbert spaces
Onset of quantum chaos and ergodicity in spin systems with highly degenerate Hilbert spaces Open
We show that in systems with highly degenerate energy spectra, such as the 2D transverse-field Ising model (2DTFIM) in the strong-field limit, quantum chaos can emerge in finite systems for arbitrary small perturbations. In this regime, th…
View article: From Bell Products to GHZ: Quantum Memories via Emergent Hamiltonians
From Bell Products to GHZ: Quantum Memories via Emergent Hamiltonians Open
With the advent of exquisite quantum emulators, storing highly entangled many-body states becomes essential. While entanglement typically builds over time when evolving a quantum system initialized in a product state, freezing that informa…
View article: Photodynamic melting of phase-reversed charge stripes and enhanced condensation
Photodynamic melting of phase-reversed charge stripes and enhanced condensation Open
The interplay between charge stripes and pairing is a longstanding point of scrutiny in a broad class of unconventional superconductors since, in some cases, it is unclear whether their intertwining benefits the ensuing superfluidity. Expe…
View article: Observation of quantum Darwinism and the origin of classicality with superconducting circuits
Observation of quantum Darwinism and the origin of classicality with superconducting circuits Open
The transition from quantum to classical behavior is a central question in modern physics. How can we rationalize everyday classical observations from an inherently quantum world? Quantum Darwinism offers a compelling framework to explain …
View article: Exact spectral function of one-dimensional Bose gases
Exact spectral function of one-dimensional Bose gases Open
Exactly solved models provide rigorous understanding of many-body phenomena in strongly correlated systems. In this article, we report a breakthrough in uncovering universal many-body correlated properties of the quantum integrable Lieb–Li…
View article: Non-Hermitian Haldane-Hubbard model: Effective description of an open system with balanced gain and loss
Non-Hermitian Haldane-Hubbard model: Effective description of an open system with balanced gain and loss Open
We study the correlated Haldane-Hubbard model with single-particle gain and loss, focusing on its non-Hermitian phase diagram and the ensuing non-unitary dynamic properties. The interplay of interactions and non-hermiticity results in insu…
View article: Observation of Quantum Darwinism and the Origin of Classicality with Superconducting Circuits
Observation of Quantum Darwinism and the Origin of Classicality with Superconducting Circuits Open
The transition from quantum to classical behavior is a central question in modern physics. How can we rationalize everyday classical observations from an inherently quantum world? For instance, what makes two people, each absorbing an inde…
View article: Weyl semimetallic, Néel, spiral, and vortex states in the Rashba-Hubbard model
Weyl semimetallic, Néel, spiral, and vortex states in the Rashba-Hubbard model Open
We investigate the evolution of magnetic phases in the Hubbard model under strong Rashba spin-orbit coupling on a square lattice. By using Lanczos exact diagonalization and determinant quantum Monte Carlo (DQMC) simulations, we explore the…
View article: Quantum highway: Observation of minimal and maximal speed limits for few and many-body states
Quantum highway: Observation of minimal and maximal speed limits for few and many-body states Open
Tracking the time evolution of a quantum state allows one to verify the thermalization rate or the propagation speed of correlations in generic quantum systems. Inspired by the energy-time uncertainty principle, bounds have been demonstrat…
View article: Quantum State Transfer in Interacting, Multiple-Excitation Systems
Quantum State Transfer in Interacting, Multiple-Excitation Systems Open
Quantum state transfer (QST) describes the coherent passage of quantum information from one node in a network to another. Experiments on QST span a diverse set of platforms and currently report transport across up to tens of nodes in times…
View article: Topological Anderson insulating phases in the interacting Haldane model
Topological Anderson insulating phases in the interacting Haldane model Open
We analyze the influence of disorder and strong correlations on the topology of two-dimensional Chern insulators. A mean-field calculation in the half-filled Haldane model with extended Hubbard interactions and Anderson disorder shows that…
View article: Stripes and the Emergence of Charge $π$-phase Shifts in Isotropically Paired Systems
Stripes and the Emergence of Charge $π$-phase Shifts in Isotropically Paired Systems Open
The interplay of spin and motional degrees of freedom forms a key element in explaining stripe formation accompanied by sublattice reversal of local antiferromagnetic ordering in interacting fermionic models. A long-standing question aims …
View article: Two-dimensional polarized superfluids under the prism of the fermion sign problem
Two-dimensional polarized superfluids under the prism of the fermion sign problem Open
Understanding if attractive fermions in an unbalanced occupation of its flavors can give rise to a superfluid state in two dimensions (2D), realizing the Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state, presents a long-standing question. A li…
View article: Multifractality and pre-thermalization in the quasi-periodically kicked Aubry-André-Harper model
Multifractality and pre-thermalization in the quasi-periodically kicked Aubry-André-Harper model Open
In a class of periodically driven systems, multifractal states in non-equilibrium conditions and robustness of dynamical localization when the driving is made aperiodic have received considerable attention. In this paper, we explore a fami…
View article: Phase transitions in the Haldane-Hubbard model
Phase transitions in the Haldane-Hubbard model Open
The Haldane-Hubbard model is a prime example of the combined effects of band topology and electronic interaction. We revisit its spinful phase diagram at half-filling as a consensus on the presence of SU($2$) symmetry is currently lacking.…
View article: Topological marker approach to an interacting Su-Schrieffer-Heeger model
Topological marker approach to an interacting Su-Schrieffer-Heeger model Open
The topological properties of the Su-Schrieffer-Heeger (SSH) model in the presence of nearest-neighbor interaction are investigated by means of a topological marker, generalized from a noninteracting one by utilizing the single-particle Gr…
View article: Topological Anderson insulating phases in the interacting Haldane model
Topological Anderson insulating phases in the interacting Haldane model Open
We analyze the influence of disorder and strong correlations on the topology in two dimensional Chern insulators. A mean field calculation in the half-filled Haldane model with extended Hubbard interactions and Anderson disorder shows that…
View article: Non-Hermitian Haldane-Hubbard model: Effective description of one- and two-body dissipation
Non-Hermitian Haldane-Hubbard model: Effective description of one- and two-body dissipation Open
Using numerically exact diagonalization, we study the correlated Haldane-Hubbard model in the presence of dissipation. Such dissipation can be modeled at short times by the dynamics governed by an effective non-Hermitian Hamiltonian, of wh…
View article: Dimensional crossover on multileg attractive-$U$ Hubbard ladders
Dimensional crossover on multileg attractive-$U$ Hubbard ladders Open
We study the ground state properties of a polarized two-component Fermi gas on multileg attractive-$U$ Hubbard ladders. Using exact diagonalization and density matrix renormalization group method simulations, we construct grand canonical p…
View article: Observation of many-body Fock space dynamics in two dimensions
Observation of many-body Fock space dynamics in two dimensions Open
Here we provide the data for figures in our work "Observation of many-body Fock space dynamics in two dimensions" .
View article: Photoinduced enhancement of superconductivity in the plaquette Hubbard model
Photoinduced enhancement of superconductivity in the plaquette Hubbard model Open
Real-time dynamics techniques have proven increasingly useful in theoretically and experimentally understanding strongly correlated systems. By employing unbiased time-resolved exact diagonalization, we study pump dynamics in the two-dimen…
View article: Disorder in interacting quasi-one-dimensional systems: flat and dispersive bands
Disorder in interacting quasi-one-dimensional systems: flat and dispersive bands Open
We investigate the superconductor-insulator transition (SIT) in disordered quasi-one dimensional systems using the density-matrix renormalization group method. Focusing on the case of an interacting spinful Hamiltonian at quarter-filling, …
View article: Higher-order topological insulator in a modified Haldane-Hubbard model
Higher-order topological insulator in a modified Haldane-Hubbard model Open
We investigate the ground-state phase diagram of a modified spinless Haldane-Hubbard model with broken threefold rotational symmetry, employing exact diagonalization calculations. The interplay of asymmetry, interactions, and topology give…
View article: Observation of many-body Fock space dynamics in two dimensions
Observation of many-body Fock space dynamics in two dimensions Open
Quantum many-body simulation provides a straightforward way to understand fundamental physics and connect with quantum information applications. However, suffering from exponentially growing Hilbert space size, characterization in terms of…
View article: Scaling of energy and power in a large quantum battery-charger model
Scaling of energy and power in a large quantum battery-charger model Open
We investigate a multiqubit quantum battery-charger model, focusing on its potential emulation on a superconducting qubit chip. Using a large-spin representation, we first obtain the analytical form of the energy E_{B}(t) and power P_{B}(t…
View article: Observation of many-body Fock space dynamics in two dimensions
Observation of many-body Fock space dynamics in two dimensions Open
Quantum many-body simulation provides a straightforward way to understand fundamental physics and connect with quantum information applications. However, suffering from exponentially growing Hilbert space size, characterization in terms of…