Pouyan Ghaemi
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View article: Effects of Strain-Induced Pseudogauge Fields on Exciton Dispersion, Transport, and Interactions in Transition Metal Dichalcogenides Nanoribbons
Effects of Strain-Induced Pseudogauge Fields on Exciton Dispersion, Transport, and Interactions in Transition Metal Dichalcogenides Nanoribbons Open
We study the effects of strain on exciton dynamics in transition metal dichalcogenide (TMD) nanoribbons. Using the Bethe-Salpeter formalism, we derive the exciton dispersion relation in strained TMDs and demonstrate that strain-induced pse…
View article: Theory of topological exciton insulators and condensates in flat Chern bands
Theory of topological exciton insulators and condensates in flat Chern bands Open
Excitons are the neutral quasiparticles that form when Coulomb interactions create bound states between electrons and holes. Due to their bosonic nature, excitons are expected to condense and exhibit superfluidity at sufficiently low tempe…
View article: Doped moiré magnets: renormalized flat bands and excitonic phases
Doped moiré magnets: renormalized flat bands and excitonic phases Open
We explore the phase diagram of a twisted bilayer of strongly interacting electrons on a honeycomb lattice close to half-filling using the slave boson mean-field theory. Our analysis indicates that a variety of new phases can be realized a…
View article: Theory of moiré magnetism and multi-domain spin textures in twisted Mott insulator - semimetal heterobilayers
Theory of moiré magnetism and multi-domain spin textures in twisted Mott insulator - semimetal heterobilayers Open
Motivated by the recent experimental developments in van der Waals heterostructures, we investigate the emergent magnetism in Mott insulator - semimetal moiré superlattices by deriving effective spin models and exploring their phase diagra…
View article: Anomalous Shiba spectrum and superconductivity induced magnetic interactions in materials with topological band inversion
Anomalous Shiba spectrum and superconductivity induced magnetic interactions in materials with topological band inversion Open
We study the Yu-Shiba-Rusinov states in materials with bulk band inversion such as iron-based topological superconductors or doped topological insulators. We show that the structure of the YSR state spectrum depends on the doping level rel…
View article: Deformed Fredkin model for the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>5</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math> Moore-Read state on thin cylinders
Deformed Fredkin model for the Moore-Read state on thin cylinders Open
We propose a frustration-free model for the Moore-Read quantum Hall state on sufficiently thin cylinders with circumferences ≲7 magnetic lengths. While the Moore-Read Hamiltonian involves complicated long-range interactions between triplet…
View article: Theory of topological exciton insulators and condensates in flat Chern bands
Theory of topological exciton insulators and condensates in flat Chern bands Open
Excitons are the neutral quasiparticles that form when Coulomb interactions create bound states between electrons and holes. Due to their bosonic nature, excitons are expected to condense and exhibit superfluidity at sufficiently low tempe…
View article: Deformed Fredkin model for the $ν{=}5/2$ Moore-Read state on thin cylinders
Deformed Fredkin model for the $ν{=}5/2$ Moore-Read state on thin cylinders Open
We propose a frustration-free model for the Moore-Read quantum Hall state on sufficiently thin cylinders with circumferences $\lesssim 7$ magnetic lengths. While the Moore-Read Hamiltonian involves complicated long-range interactions betwe…
View article: Optical Manipulation of Layer–Valley Coherence via Strong Exciton–Photon Coupling in Microcavities
Optical Manipulation of Layer–Valley Coherence via Strong Exciton–Photon Coupling in Microcavities Open
Coherent control and manipulation of quantum degrees of freedom such as spins forms the basis of emerging quantum technologies. In this context, the robust valley degree of freedom and the associated valley pseudospin found in two‐dimensio…
View article: Braiding fractional quantum Hall quasiholes on a superconducting quantum processor
Braiding fractional quantum Hall quasiholes on a superconducting quantum processor Open
Direct experimental detection of anyonic exchange statistics in fractional quantum Hall systems by braiding the excitations and measuring the wave-function phase is an enormous challenge. Here, we use a small, noisy quantum computer to emu…
View article: Anomalous Shiba states in topological iron-based superconductors
Anomalous Shiba states in topological iron-based superconductors Open
We demonstrate the formation of robust zero energy modes close to magnetic impurities in the iron-based superconductor FeSe1–xTex. We find that the Zeeman field generated by the impurity favors a spin-triplet inter-or…
View article: Optical manipulation of layer-valley coherence via strong exciton-photon coupling in microcavities
Optical manipulation of layer-valley coherence via strong exciton-photon coupling in microcavities Open
Coherent control and manipulation of quantum degrees of freedom such as spins forms the basis of emerging quantum technologies. In this context, the robust valley degree of freedom and the associated valley pseudospin found in two-dimensio…
View article: Anomalous Shiba states in topological iron-based superconductors
Anomalous Shiba states in topological iron-based superconductors Open
We demonstrate the formation of robust zero energy modes close to magnetic impurities in the iron-based superconductor FeSe$_{1-x}$Te$_x$. We find that the Zeeman field generated by the impurity favors a spin-triplet inter-orbital pairing …
View article: Probing Geometric Excitations of Fractional Quantum Hall States on Quantum Computers
Probing Geometric Excitations of Fractional Quantum Hall States on Quantum Computers Open
Intermediate-scale quantum technologies provide new opportunities for scientific discovery, yet they also pose the challenge of identifying suitable problems that can take advantage of such devices in spite of their present-day limitations…
View article: Shadow surface states in topological Kondo insulators
Shadow surface states in topological Kondo insulators Open
The surface states of 3D topological insulators in general have negligible quantum oscillations (QOs) when the chemical potential is tuned to the Dirac points. In contrast, we find that topological Kondo insulators (TKIs) can support surfa…
View article: Realizing Fractional-Quantum-Hall Gravitons on Quantum Computers
Realizing Fractional-Quantum-Hall Gravitons on Quantum Computers Open
Intermediate-scale quantum technologies provide unprecedented opportunities for scientific discoveries while posing the challenge of identifying important problems that can take advantage of them through algorithmic innovations. A major op…
View article: Designer Topological Insulator with Enhanced Gap and Suppressed Bulk Conduction in Bi<sub>2</sub>Se<sub>3</sub>/Sb<sub>2</sub>Te<sub>3</sub> Ultrashort-Period Superlattices
Designer Topological Insulator with Enhanced Gap and Suppressed Bulk Conduction in Bi<sub>2</sub>Se<sub>3</sub>/Sb<sub>2</sub>Te<sub>3</sub> Ultrashort-Period Superlattices Open
A novel approach to suppress bulk conductance in three-dimensional (3D) topological insulators (TIs) using short-period superlattices (SLs) of two TIs is presented. Evidence for superlattice gap enhancement (SGE) was obtained from the redu…
View article: Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors
Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors Open
In the superconducting regime of FeTe$_{(1-x)}$Se$_x$, there exist two types\nof vortices which are distinct by the presence or absence of zero energy states\nin their core. To understand their origin, we examine the interplay of Zeeman\nc…
View article: Unconventional Josephson junctions with topological Kondo insulator weak links
Unconventional Josephson junctions with topological Kondo insulator weak links Open
Proximity-induced superconductivity in three dimensional (3D) topological\ninsulators forms a new quantum phase of matter and accommodates exotic\nquasiparticles such as Majorana bound states. One of the biggest drawbacks of\nthe commonly …
View article: Evidence for mixed phases and percolation at the metal-insulator transition in two dimensions
Evidence for mixed phases and percolation at the metal-insulator transition in two dimensions Open
The in-plane magnetoconductance of the strongly interacting two-dimensional electron system in a silicon MOSFET (metal-oxide-semiconductor-field-effect transistor) exhibits an unmistakeable kink at a well-defined electron density, $n_k$. T…
View article: Conductance Spectroscopy of Exfoliated Thin Flakes of Nb<sub><i>x</i></sub>Bi<sub>2</sub>Se<sub>3</sub>
Conductance Spectroscopy of Exfoliated Thin Flakes of Nb<sub><i>x</i></sub>Bi<sub>2</sub>Se<sub>3</sub> Open
We study unconventional superconductivity in exfoliated single crystals of a promising three-dimensional (3D) topological superconductor candidate, Nb-doped Bi2Se3 through differential conductance spectroscopy and mag…
View article: Anomalous Kink in the Magnetoconductance at the Metal-Insulator Transition in Two Dimensions
Anomalous Kink in the Magnetoconductance at the Metal-Insulator Transition in Two Dimensions Open
Measurements of the in-plane magnetoconductance of the strongly interacting two-dimensional electron system in a silicon MOSFET (Metal-Oxide-Semiconductor-Field-Effect Transistor) reveal the occurrence of a quasi-thermodynamic phase transi…
View article: Odd-frequency pairing in the edge states of superconducting pnictides in the coexistence phase with antiferromagnetism
Odd-frequency pairing in the edge states of superconducting pnictides in the coexistence phase with antiferromagnetism Open
In several members of the pnictide materials, spin density wave order\ncoexists with superconductivity over a range of dopings and temperature. In\nthis paper we show that odd-frequency superconductivity emerges on the edges of\npnictides …
View article: Optical control over bulk excitations in fractional quantum Hall systems
Optical control over bulk excitations in fractional quantum Hall systems Open
Local excitations in fractional quantum Hall systems are amongst the most\nintriguing objects in condensed matter, as they behave like particles of\nfractional charge and fractional statistics. In order to experimentally reveal\nthese exot…
View article: Anisotropic exciton transport in transition-metal dichalcogenides
Anisotropic exciton transport in transition-metal dichalcogenides Open
Due to the Coulomb interaction exciton eignestates in monolayer transitional\nmetal dichalcogenides are coherent superposition of two valleys. The exciton\nband which couples to the transverse electric mode of light has parabolic\ndispersi…
View article: Light-Induced Fractional Quantum Hall Phases in Graphene
Light-Induced Fractional Quantum Hall Phases in Graphene Open
We show how to realize two-component fractional quantum Hall phases in monolayer graphene by optically driving the system. A laser is tuned into resonance between two Landau levels, giving rise to an effective tunneling between these two s…
View article: Andreev Reflection Spectroscopy of Topological Superconductor Candidate Nb$_x$Bi$_2$Se$_3$
Andreev Reflection Spectroscopy of Topological Superconductor Candidate Nb$_x$Bi$_2$Se$_3$ Open
We study unconventional superconductivity in thin exfoliated single crystals of a promising 3D topological superconductor candidate, Nb-doped Bi$_2$Se$_3$ through Andreev reflection spectroscopy and magneto-transport. Measurements of Andre…
View article: High-order multipole radiation from quantum Hall states in Dirac materials
High-order multipole radiation from quantum Hall states in Dirac materials Open
We investigate the optical response of strongly disordered quantum Hall states in two-dimensional Dirac materials and find qualitatively different effects in the radiation properties of the bulk versus the edge. We show that the far-field …
View article: Competing adiabatic Thouless pumps in enlarged parameter spaces
Competing adiabatic Thouless pumps in enlarged parameter spaces Open
The transfer of conserved charges through insulating matter via smooth\ndeformations of the Hamiltonian is known as quantum adiabatic, or Thouless,\npumping. Central to this phenomenon are Hamiltonians whose insulating gap is\ncontrolled b…
View article: Light-induced fractional quantum Hall phases in graphene
Light-induced fractional quantum Hall phases in graphene Open
We show how to realize two-component fractional quantum Hall phases in monolayer graphene by optically driving the system. A laser is tuned into resonance between two Landau levels, giving rise to an effective tunneling between these two s…