V. Ahufinger
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View article: Topological bound states in a lattice of rings with nearest-neighbour interactions
Topological bound states in a lattice of rings with nearest-neighbour interactions Open
We study interaction-induced bound states in a system of ultracold bosons loaded into the states with orbital angular momentum in a one-dimensional staggered lattice of rings. We consider the hard-core limit and strong nearest-neighbour in…
View article: Flux-mediated effective Su–Schrieffer–Heeger model in an impurity decorated diamond chain
Flux-mediated effective Su–Schrieffer–Heeger model in an impurity decorated diamond chain Open
In photonic flat-band (FB) systems, which are characterized by a halting of light transmission, perturbations can play a major role in determining the transport properties of the system. In this work, this is exploited by purposefully incl…
View article: Flux-mediated effective Su-Schrieffer-Heeger model in an impurity decorated diamond chain
Flux-mediated effective Su-Schrieffer-Heeger model in an impurity decorated diamond chain Open
In flat-band systems with non-orthogonal compact localized states (CLSs), onsite perturbations couple neighboring CLSs and generate exponentially-decaying impurity states, whose degree of localization depends on lattice parameters. In this…
View article: Ultracold atoms carrying orbital angular momentum: Engineering topological phases in lattices
Ultracold atoms carrying orbital angular momentum: Engineering topological phases in lattices Open
Ultracold atoms carrying Orbital Angular Momentum (OAM) loaded in lattices constitute a promising platform for engineering topological systems either at the single-particle limit or in the presence of interactions. In this review, we repor…
View article: Topological <i>n</i>-root Su–Schrieffer–Heeger model in a non-Hermitian photonic ring system
Topological <i>n</i>-root Su–Schrieffer–Heeger model in a non-Hermitian photonic ring system Open
Square-root topology is one of the newest additions to the ever expanding field of topological insulators (TIs). It characterizes systems that relate to their parent TI through the squaring of their Hamiltonians. Extensions to 2 n -root to…
View article: Trapping of Bose-Einstein condensates in a three-dimensional dark focus generated by conical refraction
Trapping of Bose-Einstein condensates in a three-dimensional dark focus generated by conical refraction Open
We present an efficient three-dimensional dark-focus optical trapping\npotential for neutral atoms and Bose-Einstein condensates. This "optical\nbottle" is created by a single blue-detuned light field exploiting the\nphenomenon of conical …
View article: Topological $n$-root Su-Schrieffer-Heeger model in a non-Hermitian photonic ring system
Topological $n$-root Su-Schrieffer-Heeger model in a non-Hermitian photonic ring system Open
Square-root topology is one of the newest additions to the ever expanding field of topological insulators (TIs). It characterizes systems that relate to their parent TI through the squaring of their Hamiltonians. Extensions to $2^n$-root t…
View article: Flat-band induced local Hilbert space fragmentation
Flat-band induced local Hilbert space fragmentation Open
We demonstrate that a complete class of flat-band lattices with underlying commutative local symmetries exhibit a locally fragmented Hilbert space. The equitable partition theorem ensures distinct parities for the compact localized states …
View article: Bosonic orbital Su-Schrieffer-Heeger model in a lattice of rings
Bosonic orbital Su-Schrieffer-Heeger model in a lattice of rings Open
We study the topological properties of interacting and non-interacting bosons loaded in the orbital angular momentum states $l=1$ in a lattice of rings with alternating distances. At the single-particle level, the two circulation states wi…
View article: Mode pumping in photonic lattices using a single tailored auxiliary waveguide
Mode pumping in photonic lattices using a single tailored auxiliary waveguide Open
In this work, we propose a completely general method to pump the gapped\ntopological modes of a lattice of optical waveguides by controlling the\npropagation constant of an auxiliary waveguide and its coupling to the main\nlattice. In this…
View article: Quantum-jump analysis of frequency up-conversion amplification without inversion in a four-level scheme
Quantum-jump analysis of frequency up-conversion amplification without inversion in a four-level scheme Open
In this work, we use the quantum-jump approach to study light-matter\ninteractions in a four-level scheme giving rise to frequency up-conversion\namplification without inversion (AWI). The results obtained apply to the case\nof neutral Hg …
View article: Mode pumping in photonic lattices using a single tailored auxiliary waveguide
Mode pumping in photonic lattices using a single tailored auxiliary waveguide Open
In this work, we propose a completely general method to pump the gapped topological modes of a lattice of optical waveguides by controlling the propagation constant of an auxiliary waveguide and its coupling to the main lattice. In this wa…
View article: Local Hilbert space fragmentation and weak thermalization in Bose-Hubbard diamond necklaces
Local Hilbert space fragmentation and weak thermalization in Bose-Hubbard diamond necklaces Open
We study Bose-Hubbard models in a family of diamond necklace lattices with $n$ central sites. The single-particle spectrum of these models presents compact localized states (CLSs) that occupy the up and down sites of each diamond. By perfo…
View article: Many-body Aharonov-Bohm caging in a lattice of rings
Many-body Aharonov-Bohm caging in a lattice of rings Open
We study a system of a few ultracold bosons loaded into the states with orbital angular momentum $l=1$ of a one-dimensional staggered lattice of rings. Local eigenstates with winding numbers $+l$ and $-l$ form a Creutz ladder with a real d…
View article: High-efficiency topological pumping with discrete supersymmetry transformations
High-efficiency topological pumping with discrete supersymmetry transformations Open
Making use of the isospectrality of Supersymmetry transformations, we propose a general and high-fidelity method to prepare gapped topological modes in discrete systems from a single-site excitation. The method consists of adiabatically co…
View article: Spatially strongly confined atomic excitation via a two dimensional stimulated Raman adiabatic passage
Spatially strongly confined atomic excitation via a two dimensional stimulated Raman adiabatic passage Open
We consider a method of sub-wavelength superlocalization and patterning of atomic matter waves via a two dimensional stimulated Raman adiabatic passage (2D STIRAP) process. An atom initially prepared in its ground level interacts with a do…
View article: Supersymmetry-enhanced stark-chirped rapid-adiabatic-passage in multimode optical waveguides
Supersymmetry-enhanced stark-chirped rapid-adiabatic-passage in multimode optical waveguides Open
We propose a method to efficiently pump an excited mode of a multimode optical waveguide starting from a fundamental-mode input by combining Stark-Chirped Rapid Adiabatic Passage (SCRAP) and Supersymmetry (SUSY) transformations. In a two-w…
View article: Roadmap on Atomtronics: State of the art and perspective
Roadmap on Atomtronics: State of the art and perspective Open
Atomtronics deals with matter-wave circuits of ultracold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types of quantum networks can be constructed in which coherent fl…
View article: Roadmap on Atomtronics
Roadmap on Atomtronics Open
Atomtronics is an emerging field of quantum technology dealing with matter-wave circuits of ultra-cold atoms manipulated in magnetic or laser-generated guides of different shapes and intensity. Atomtronic circuits are promised to define qu…
View article: Orbital angular momentum dynamics of Bose-Einstein condensates trapped in two stacked rings
Orbital angular momentum dynamics of Bose-Einstein condensates trapped in two stacked rings Open
We investigate the stability and dynamics of the orbital angular momentum modes of a repulsive Bose-Einstein condensate trapped in two tunnel-coupled rings in a stack configuration. Within mean-field theory, we derive a two-state model for…
View article: Roadmap on Atomtronics: State of the art and perspective
Roadmap on Atomtronics: State of the art and perspective Open
Atomtronics deals with matter-wave circuits of ultra-cold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types of quantum networks can be constructed, in which coherent …
View article: State of the art and perspective on Atomtronics
State of the art and perspective on Atomtronics Open
Atomtronics deals with matter-wave circuits of ultra-cold atoms manipulated through magnetic or laser-generated guides with different shapes and intensities. In this way, new types of quantum networks can be constructed, in which coherent …
View article: Coherent spin mixing via spin-orbit coupling in Bose gases
Coherent spin mixing via spin-orbit coupling in Bose gases Open
We study beyond-mean-field properties of interacting spin-1 Bose gases with\nsynthetic Rashba-Dresselhaus spin-orbit coupling at low energies. We derive a\nmany-body Hamiltonian following a tight-binding approximation in quasi-momentum\nsp…
View article: Quantum magnetism with ultracold bosons carrying orbital angular momentum
Quantum magnetism with ultracold bosons carrying orbital angular momentum Open
We show how strongly correlated ultracold bosonic atoms loaded in specific\norbital angular momentum states of arrays of cylindrically symmetric potentials\ncan realize a variety of spin-1/2 models of quantum magnetism. We consider\nexplic…
View article: Topological edge states and Aharanov-Bohm caging with ultracold atoms carrying orbital angular momentum
Topological edge states and Aharanov-Bohm caging with ultracold atoms carrying orbital angular momentum Open
We show that bosonic atoms loaded into orbital angular momentum $l=1$ states\nof a lattice in a diamond-chain geometry provides a flexible and simple\nplatform for exploring a range of topological effects. This system exhibits\nrobust edge…
View article: Topological edge states with ultracold atoms carrying orbital angular momentum in a diamond chain
Topological edge states with ultracold atoms carrying orbital angular momentum in a diamond chain Open
We study the single-particle properties of a system formed by ultracold atoms\nloaded into the manifold of $l=1$ Orbital Angular Momentum (OAM) states of an\noptical lattice with a diamond chain geometry. Through a series of successive\nba…
View article: Integrated photonic devices based on adiabatic transitions between supersymmetric structures
Integrated photonic devices based on adiabatic transitions between supersymmetric structures Open
We introduce adiabatic transitions connecting two supersymmetric partner profiles by smoothly modifying the transverse refractive index profile along the propagation direction. With this transformation, one of the transverse electric modes…