Explanipedia

Non-Hermitian trapping of Dirac exciton-polariton condensates in a perovskite metasurface Open

Mikhail Masharin, I. Yu. Chestnov, A. Bochin, Pavel Kozhevin, V. Shahnazaryan , et al. · 2025

Massless Dirac particles avoid trapping due to their exceptional tunneling properties manifested in the so-called Klein paradox. This conclusion stems from the conservative treatment, but so far, it has not been extended to a non-Hermitian…

Chiral cavity-induced quantum phase transitions in a quantum ring Open

Ivan Iorsh · 2025

We consider a quantum ring placed in a gyrotropic cavity characterized by the energy splitting between the left and right circularly polarized modes. We show that despite the absence of constant magnetic field penetrating through the ring,…

Anomalous Reflection from Hyperbolic Media Open

Ilya Deriy, Kseniia Lezhennikova, Stanislav Glybovski, Ivan Iorsh, Oleh Yermakov , et al. · 2025

Intrinsically chiral exciton polaritons in an atomically-thin semiconductor Open

Matthias Wurdack, Ivan Iorsh, Tobias Bucher, Sarka Vavreckova, Eliezer Estrecho , et al. · 2024

Photonic bound states in the continuum (BICs) have emerged as a versatile tool for enhancing light-matter interactions by strongly confining light fields. Chiral BICs are photonic resonances with a high degree of circular polarisation, whi…

Polaron effect in waveguide quantum optomechanics Open

Denis Ilin, Alexander S. Solntsev, Ivan Iorsh · 2024

We investigate the impact of the quantized mechanical motion of optically trapped atoms, arranged in proximity to a one-dimensional waveguide, on the propagation of polariton modes. Our study identifies a regime of resonant phonon-assisted…

Linear spectroscopy of collective modes and the gap structure in two-dimensional superconductors Open

B. A. Levitan, Yuval Oreg, Erez Berg, Mark S. Rudner, Ivan Iorsh · 2024

We consider optical response in multiband, multilayer two-dimensional superconductors. Within a simple model, we show that linear response to AC gating can detect collective modes of the condensate, such as Leggett and clapping modes. We s…

Electronic states bound by repulsive potentials in graphene irradiated by a circularly polarized electromagnetic field Open

O. V. Kibis, M. V. Boev, Ivan Iorsh, V. M. Kovalev · 2024

In the framework of the Floquet theory of periodically driven quantum systems, it is demonstrated that irradiation of graphene by a circularly polarized electromagnetic field induces an attractive area in the core of repulsive potentials. …

Exciton-polariton stimulated scattering in hybrid halide perovskites Open

I. Yu. Chestnov, Mikhail Masharin, V. I. Kondratyev, Ivan Iorsh, A. K. Samusev , et al. · 2024

Halide perovskites, such as methylammonium lead bromide (MAPbBr$_3$), host tightly bound three-dimensional excitons which are robust at room temperature. Excellent optical properties of MAPbBr$_3$ allow for designing of optical single-mode…

Linear spectroscopy of collective modes and the gap structure in two-dimensional superconductors Open

B. A. Levitan, Yuval Oreg, Erez Berg, Mark S. Rudner, Ivan Iorsh · 2024

We consider optical response in multi-band, multi-layer two-dimensional superconductors. Within a simple model, we show that linear response to AC gating can detect collective modes of the condensate, such as Leggett and clapping modes. We…

Electrostatic control of nonlinear photonic-crystal polaritons in a monolayer semiconductor Open

Ekaterina Khestanova, V. Shahnazaryan, Valerii K. Kozin, V. I. Kondratyev, D. N. Krizhanovskii , et al. · 2024

Integration of 2D semiconductors with photonic crystal slabs provides an attractive approach to achieve strong light--matter coupling and exciton-polariton formation in a planar chip-compatible geometry. However, for the development of pra…

Polariton lasing in Mie-resonant perovskite nanocavity Open

Mikhail Masharin, Daria Khmelevskaia, Valeriy I. Kondratiev, Daria I. Markina, Anton D. Utyushev , et al. · 2024

Deeply subwavelength lasers (or nanolasers) are highly demanded for compact \non-chip bioimaging and sensing at the nanoscale. One of the main obstacles for \nthe development of single-particle nanolasers with all three dimensions shorter …

Generating ${\rm N00N}$-states of surface plasmon-polariton pairs with a nanoparticle Open

Nikita A. Olekhno, Mihail Petrov, Ivan Iorsh, Andrey A. Sukhorukov, Alexander S. Solntsev · 2023

We consider a generation of two-particle quantum states in the process of spontaneous parametric down-conversion of light by a dielectric nanoparticle with $\chi^{(2)}$ response. As a particular example, we study the generation of surface …

Cavity optomechanics in ultrastrong light matter coupling regime: Self-alignment and collective rotation mediated by Casimir torque Open

Denis Ilin, I. V. Tokatly, Ivan Iorsh · 2023

We theoretically consider an ensemble of quantum dimers placed inside an optical cavity. We predict two effects: first, an exchange of angular momentum between the dimers mediated by the emission and re-absorption of the cavity photons lea…

Quantum electrodynamical density functional theory for generalized Dicke model Open

A. Kudlis, D. Novokreschenov, Ivan Iorsh, I. V. Tokatly · 2023

We formulate and analyze in detail the ground state quantum electrodynamical density functional theory (QEDFT) for a generalized Dicke model describing a collection of $N$ tight-binding dimers minimally coupled to a cavity photon mode. Thi…

Photoluminescence imaging of single photon emitters within nanoscale strain profiles in monolayer WSe2 Open

Artem N. Abramov, I. Yu. Chestnov, Ekaterina S. Alimova, Т.И. Иванова, Ivan S. Mukhin , et al. · 2023

Local deformation of atomically thin van der Waals materials provides a powerful approach to create site-controlled chip-compatible single-photon emitters (SPEs). However, the microscopic mechanisms underlying the formation of such strain-…

All-optical magnetization control in monolayers: A microscopic theory Open

A. Kudlis, M. Kazemi, Yaroslav Zhumagulov, Hendrik Schrautzer, A. I. Chernov , et al. · 2023

Bright excitons in ferromagnetic monolayers of CrI3 efficiently interact with lattice magnetization, which makes all-optical resonant magnetization control possible in this material. Using the combination of ab initio simulations within th…

Anomalous Reflection From Hyperbolic Media Open

Ilya Deriy, Kseniia Lezhennikova, Stanislav Glybovsky, Ivan Iorsh, Oleh Yermakov , et al. · 2023

Despite the apparent simplicity, the problem of refraction of electromagnetic waves at the planar interface between two media has an incredibly rich spectrum of unusual phenomena. An example is the paradox that occurs when an electromagnet…

Nonlinear self-action of ultrashort guided exciton–polariton pulses in dielectric slab coupled to 2D semiconductor Open

Fedor A. Benimetskiy, A. V. Yulin, Alexey Mikhin, Vasily Kravtsov, Ivan Iorsh , et al. · 2023

Recently reported large values of exciton–polariton nonlinearity of transition metal dichalcogenide (TMD) monolayers coupled to optically resonant structures approach the values characteristic for GaAs-based systems in the regime of strong…

Exciton localization on a magnetic domain wall in MoSe$_2$-CrI$_3$ heterostructure Open

Seppo Mikkola, V. Shahnazaryan, I. Yu. Chestnov, Ivan Iorsh · 2023

The existence of spontaneous magnetization that fingerprints a ground-state ferromagnetic order was recently observed in two-dimensional (2D) van der Waals materials. Despite progress in the fabrication and manipulation of the atom-thick m…

Floquet engineering of the Lifshitz phase transition in the Hubbard model Open

Ivan Iorsh, D. D. Sedov, Stanislav Kolodny, R.E. Sinitskiy, O. V. Kibis · 2023

Within the Floquet theory of periodically driven quantum systems, we demonstrate that an off-resonant high-frequency electromagnetic field can induce the Lifshitz phase transition in periodical structures described by the one-dimensional r…

Probing and control of guided exciton-polaritons in a 2D semiconductor-integrated slab waveguide Open

V. I. Kondratyev, Dmitry V. Permyakov, Tatiana Ivanova, Ivan Iorsh, D. N. Krizhanovskii , et al. · 2023

Guided 2D exciton-polaritons, resulting from the strong coupling of excitons in semiconductors with non-radiating waveguide modes, provide an attractive approach towards developing novel on-chip optical devices. These quasiparticles are ch…

Polariton lasing in Mie-resonant perovskite nanocavity Open

Mikhail Masharin, Daria Khmelevskaia, V. I. Kondratiev, Daria I. Markina, Anton D. Utyushev , et al. · 2023

Deeply subwavelength lasers (or nanolasers) are highly demanded for compact on-chip bioimaging and sensing at the nanoscale. One of the main obstacles for the development of single-particle nanolasers with all three dimensions shorter than…

Cavity-induced charge transfer in periodic systems: length-gauge formalism Open

Ekaterina Vlasiuk, Valerii K. Kozin, Jelena Klinovaja, Daniel Loss, Ivan Iorsh , et al. · 2023

We develop a length-gauge formalism for treating one-dimensional periodic lattice systems in the presence of a photon cavity inducing light-matter interaction. The purpose of the formalism is to remove mathematical ambiguities that occur w…

Skyrmion dynamics in moiré magnets Open

Polina S. Shaban, I. S. Lobanov, Valerii Uzdin, Ivan Iorsh · 2023

We consider a twisted magnetic bilayer subject to the perpendicular electric field. The interplay of induced Dzyaloshinskii - Moriya interaction and spatially varying moiré exchange potential results in complex non-collinear magnetic phase…

Non-perturbative effects of deep-strong light-matter interaction in a mesoscopic cavity-QED system Open

A. Kudlis, D. Novokreschenov, Ivan Iorsh, I. V. Tokatly · 2023

We consider a system comprising two groups of quantum dimers placed in a common electromagnetic cavity, and controlled by selectively applying a static external potential to one of the groups. We show that in the regime of deep strong coup…

Photoluminescence imaging of single photon emitters within nanoscale strain profiles in monolayer WSe$_2$ Open

Artem N. Abramov, I. Yu. Chestnov, Ekaterina S. Alimova, Т.И. Иванова, Ivan S. Mukhin , et al. · 2023

Local deformation of atomically thin van der Waals materials provides a powerful approach to create site-controlled chip-compatible single-photon emitters (SPEs). However, the microscopic mechanisms underlying the formation of such strain-…

Room-temperature exceptional-point-driven polariton lasing from perovskite metasurface Open

M. A. Masharin, A. K. Samusev, A. A. Bogdanov, Ivan Iorsh, H. V. Demir , et al. · 2022

Excitons in lead bromide perovskites exhibit high binding energy and high oscillator strength, allowing for a strong light-matter coupling regime in the perovskite-based cavities localizing photons at the nanoscale. This opens up the way f…

Bulk ReSe2: record high refractive index and biaxially anisotropic material for all-dielectric nanophotonics Open

Alexey Mikhin, Anton Shubnic, T. Ivanova, I. A. Shelykh, A. K. Samusev , et al. · 2022

We show that bulk rhenium diselenide, ReSe2 is characterized by record high value of the refractive index exceeding 5 in near-infrared frequency range. We use back focal plane reflection spectroscopy to extract the components of the ReSe2 …

Interacting exciton-polaritons in cylindric micropillars Open

Y. S. Krivosenko, Ivan Iorsh, I. A. Shelykh · 2022

We present a quantitative microscopic analysis of the formation of exciton-polaritons, the composite particles possessing light and material components, polariton-polariton interactions, and resonant pumping dynamics in cylindrical semicon…

Dynamical stabilization by vacuum fluctuations in a cavity: Resonant electron scattering in the ultrastrong light-matter coupling regime Open

Dmitry A. Zezyulin, Stanislav Kolodny, O. V. Kibis, I. V. Tokatly, Ivan Iorsh · 2022

We developed a theory of electron scattering by a short-range repulsive potential in a cavity. In the regime of ultrastrong electron coupling to the cavity electromagnetic field, the vacuum fluctuations of the field result in the dynamical…

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