Ragheed Alhyder
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View article: Phenomenological model of decaying Bose polarons
Phenomenological model of decaying Bose polarons Open
Cold atom experiments show that a mobile impurity particle immersed in a Bose-Einstein condensate forms a well-defined quasiparticle (Bose polaron) for weak to moderate impurity-boson interaction strengths, whereas a significant line broad…
View article: Lattice Bose polarons at strong coupling and quantum criticality
Lattice Bose polarons at strong coupling and quantum criticality Open
The problem of mobile impurities in quantum baths is of fundamental importance in many-body physics. There has recently been significant progress regarding our understanding of this due to cold atom experiments, but so far it has mainly be…
View article: Tunable Field-Linked $s$-wave Interactions in Dipolar Fermi Mixtures
Tunable Field-Linked $s$-wave Interactions in Dipolar Fermi Mixtures Open
Spin mixtures of degenerate fermions are a cornerstone of quantum many-body physics, enabling superfluidity, polarons, and rich spin dynamics through $s$-wave scattering resonances. Combining them with strong, long-range dipolar interactio…
View article: Quantum transport in the presence of a chiral molecular potential
Quantum transport in the presence of a chiral molecular potential Open
We investigate quantum transport in a two-dimensional electron system coupled to a chiral molecular potential, demonstrating how molecular chirality and orientation affect charge and spin transport properties. We propose a minimal model fo…
View article: Domain-Wall Ferroelectric Polarons in a Two-Dimensional Rotor Lattice Model
Domain-Wall Ferroelectric Polarons in a Two-Dimensional Rotor Lattice Model Open
We demonstrate the formation of ferroelectric domain-wall polarons in a minimal two-dimensional lattice model of electrons interacting with rotating dipoles. Along the domain wall, the rotors polarize in opposite directions, causing the el…
View article: Lattice Bose polarons at strong coupling and quantum criticality
Lattice Bose polarons at strong coupling and quantum criticality Open
We develop a new theoretical framework for exploring a mobile impurity interacting strongly with a highly correlated bath of bosons in the quantum critical regime of a Mott insulator (MI) to superfluid (SF) quantum phase transition. Our fr…
View article: Domain-Wall Ferroelectric Polarons in a two-dimensional Rotor Lattice Model
Domain-Wall Ferroelectric Polarons in a two-dimensional Rotor Lattice Model Open
We demonstrate the formation of ferroelectric domain-wall polarons in a minimal two-dimensional lattice model of electrons interacting with rotating dipoles. Along the domain-wall, the rotors polarize in opposite directions, causing the el…
View article: Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy
Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy Open
We perform a diagrammatic analysis of the energy of a mobile impurity immersed in a strongly interacting two-component Fermi gas to second order in the impurity-bath interaction. These corrections demonstrate divergent behavior in the limi…
View article: Multipurpose platform for analog quantum simulation
Multipurpose platform for analog quantum simulation Open
Atom-based quantum simulators have had many successes in tackling challenging quantum many-body problems, owing to the precise and dynamical control that they provide over the systems' parameters. They are, however, often optimized to addr…
View article: Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy
Exploring beyond-mean-field logarithmic divergences in Fermi-polaron energy Open
We perform a diagrammatic analysis of the energy of a mobile impurity immersed in a strongly interacting two component Fermi gas to second order in the impurity-bath interaction. These corrections demonstrate divergent behavior in the limi…
View article: Achiral dipoles on a ferromagnet can affect its magnetization direction
Achiral dipoles on a ferromagnet can affect its magnetization direction Open
We demonstrate the possibility of a coupling between the magnetization direction of a ferromagnet and the tilting angle of adsorbed achiral molecules. To illustrate the mechanism of the coupling, we analyze a minimal Stoner model that incl…
View article: Achiral dipoles on a ferromagnet can affect its magnetization direction
Achiral dipoles on a ferromagnet can affect its magnetization direction Open
We demonstrate the possibility of a coupling between the magnetization direction of a ferromagnet and the tilting angle of adsorbed achiral molecules. To illustrate the mechanism of the coupling, we analyze a minimal Stoner model that incl…
View article: Mobile impurity probing a two-dimensional superfluid phase transition
Mobile impurity probing a two-dimensional superfluid phase transition Open
The use of atomically sized quantum systems as highly sensitive measuring devices represents an exciting and quickly growing research field. Here, we explore the properties of a quasiparticle formed by a mobile impurity interacting with a …
View article: Ultracold Fermi gases : next generation experiment and impurity physics
Ultracold Fermi gases : next generation experiment and impurity physics Open
Part of the thesis concerns the description of a new generation experiment built within the ultra-cold fermion gas team at the Kastler Brossel laboratory. The experimental steps that lead to the realization and characterization of a fermio…
View article: Impurity immersed in a double Fermi sea
Impurity immersed in a double Fermi sea Open
We present a variational calculation of the energy of an impurity immersed a\ndouble Fermi sea of non-interacting Fermions. We show that in the\nstrong-coupling regime, the system undergoes a first order transition between\npolaronic and t…
View article: An impurity immersed in a double Fermi Sea
An impurity immersed in a double Fermi Sea Open
We present a variational calculation of the energy of an impurity immersed a double Fermi sea of non-interacting Fermions. We show that in the strong-coupling regime, the system undergoes a first order transition between polaronic and trim…