M. Potemski
YOU?
Author Swipe
View article: Deconstruction of the Anisotropic Magnetic Interactions from Spin‐Entangled Optical Excitations in van der Waals Antiferromagnets
Deconstruction of the Anisotropic Magnetic Interactions from Spin‐Entangled Optical Excitations in van der Waals Antiferromagnets Open
Magneto‐optical excitations in antiferromagnetic d systems can originate from a multiplicity of light‐spin and spin‐spin interactions, as the light and spin degrees of freedom can be entangled. This is exemplified in van der Waals systems …
View article: Strong and selective magnon-phonon coupling in van der Waals antiferromagnet CoPS$_3$
Strong and selective magnon-phonon coupling in van der Waals antiferromagnet CoPS$_3$ Open
The Raman scattering response of the biaxial antiferromagnet CoPS$_3$ has been investigated as a function of both magnetic field and temperature. The peaks observed in the low-frequency spectral range (90--200~cm$^{-1}$) have been identifi…
View article: Dynamics of surface electrons in a topological insulator: cyclotron resonance at room temperature
Dynamics of surface electrons in a topological insulator: cyclotron resonance at room temperature Open
The ability to manipulate the surface states of topological insulators using electric or magnetic fields under ambient conditions is a key step toward their integration into future electronic and optoelectronic devices. Here, we demonstrat…
View article: Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states
Extremely high excitonic $g$-factors in 2D crystals by alloy-induced admixing of band states Open
Monolayers (MLs) of semiconducting transition metal dichalcogenides (\mbox{S-TMDs}) emit light very efficiently and display rich spin-valley physics, with gyromagnetic ($g$-) factors of about -4. Here, we investigate how these properties c…
View article: Hybrid Electroluminescence Device for On‐Demand Single Photon Generation at Room Temperature
Hybrid Electroluminescence Device for On‐Demand Single Photon Generation at Room Temperature Open
Recent research focused on single photon emitters (SPEs) hosted by layered semiconductors, particularly hexagonal boron nitride (hBN), has revealed a promising alternative to quantum dots (QDs) for generating single, indistinguishable phot…
View article: Hybridization of Terahertz Phonons and Magnons in Disparate and Spatially‐Separated Material Specimens
Hybridization of Terahertz Phonons and Magnons in Disparate and Spatially‐Separated Material Specimens Open
The interaction between condensed matter excitations and electromagnetic cavity fields serves as a rich playground for fundamental research and lies at the core of photonic and quantum technologies. Herein, the intriguing concept of compos…
View article: Impact of temperature on the brightening of neutral and charged dark excitons in WSe <sub>2</sub> monolayer
Impact of temperature on the brightening of neutral and charged dark excitons in WSe <sub>2</sub> monolayer Open
Optically dark states play an important role in the electronic and optical properties of monolayers (MLs) of semiconducting transition metal dichalcogenides. The effect of temperature on the in-plane-field activation of the neutral and cha…
View article: Tuning THz magnons in a mixed van-der-Waals antiferromagnet
Tuning THz magnons in a mixed van-der-Waals antiferromagnet Open
Alloying stands out as a pivotal technological method employed across various compounds, be they metallic, magnetic, or semiconducting, serving to fine-tune their properties to meet specific requirements. Ternary semiconductors represent a…
View article: Hybrid electroluminescence device for on-demand single photon generation at room temperature
Hybrid electroluminescence device for on-demand single photon generation at room temperature Open
Recent research focused on single photon emitters (SPEs) hosted by layered semiconductors, particularly hexagonal boron nitride (hBN), has revealed a promising alternative to quantum dots (QDs) for generating single, indistinguishable phot…
View article: Electroluminescent vertical tunneling junctions based on WSe <sub>2</sub> monolayer quantum emitter arrays: Exploring tunability with electric and magnetic fields
Electroluminescent vertical tunneling junctions based on WSe <sub>2</sub> monolayer quantum emitter arrays: Exploring tunability with electric and magnetic fields Open
We experimentally demonstrate the creation of defects in monolayer WSe 2 via nanopillar imprinting and helium ion irradiation. Based on the first method, we realize atomically thin vertical tunneling light-emitting diodes based on WSe 2 mo…
View article: Short excitonic lifetimes of MoSe<sub>2</sub> monolayers grown by molecular beam epitaxy on the hexagonal boron nitride
Short excitonic lifetimes of MoSe<sub>2</sub> monolayers grown by molecular beam epitaxy on the hexagonal boron nitride Open
We present a time-resolved optical study of recently developed narrow-line MoSe 2 monolayers grown on hexagonal boron nitride with means of molecular beam epitaxy. We find that the photoluminescence decay times are significantly shorter th…
View article: Interactions and ultrafast dynamics of exciton complexes in a monolayer semiconductor with electron gas
Interactions and ultrafast dynamics of exciton complexes in a monolayer semiconductor with electron gas Open
We present femtosecond pump-probe measurements of neutral and charged exciton optical response in monolayer MoSe 2 to resonant photoexcitation of a given exciton state in the presence of 2D electron gas. We show that creation of charged ex…
View article: Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides Open
Raman scattering excitation (RSE) is an experimental technique in which the spectrum is made up by sweeping the excitation energy when the detection energy is fixed. We study the low-temperature ( T = 5 K) RSE spectra measured on four high…
View article: Transverse and longitudinal magnons in strongly anisotropic antiferromagnet FePSe3
Transverse and longitudinal magnons in strongly anisotropic antiferromagnet FePSe3 Open
FePSe3 is a collinear honeycomb antiferromagnet with an easy-axis anisotropy and large spins S=2. It belongs to a family of magnetic van der Waals materials, which recently attracted a considerable attention. In this work we present an exp…
View article: Magneto-Optical Sensing of the Pressure Driven Magnetic Ground States in Bulk CrSBr
Magneto-Optical Sensing of the Pressure Driven Magnetic Ground States in Bulk CrSBr Open
Competition between exchange interactions and magnetocrystalline anisotropy may bring new magnetic states that are of great current interest. An applied hydrostatic pressure can further be used to tune their balance. In this work, we inves…
View article: Magnon gap excitations in van der Waals antiferromagnet MnPSe$_3$
Magnon gap excitations in van der Waals antiferromagnet MnPSe$_3$ Open
Magneto-spectroscopy methods have been employed to study the zero-wavevector magnon excitations in MnPSe$_3$. Experiments carried out as a function of temperature and the applied magnetic field show that two low-energy magnon branches of M…
View article: Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides Open
Raman scattering excitation (RSE) is an experimental technique in which the spectrum is made up by sweeping the excitation energy when the detection energy is fixed. We study the low-temperature ($T$=5~K) RSE spectra measured on four high …
View article: Enhancement of electron magnetic susceptibility due to many-body interactions in monolayer MoSe<sub>2</sub>
Enhancement of electron magnetic susceptibility due to many-body interactions in monolayer MoSe<sub>2</sub> Open
Employing the original, all-optical method, we quantify the magnetic susceptibility of a two-dimensional electron gas (2DEG) confined in the MoSe 2 monolayer in the range of low and moderate carrier densities. The impact of electron–electr…
View article: In-plane magnetocrystalline anisotropy in the van der Waals antiferromagnet FePSe$_3$ probed by magneto-Raman scattering
In-plane magnetocrystalline anisotropy in the van der Waals antiferromagnet FePSe$_3$ probed by magneto-Raman scattering Open
Magnon gap excitations selectively coupled to phonon modes have been studied in FePSe$_3$ layered antiferromagnet with magneto-Raman scattering experiments performed at different temperatures. The bare magnon excitation in this material ha…
View article: Dielectric Environment Sensitivity of Carbon Centers in Hexagonal Boron Nitride
Dielectric Environment Sensitivity of Carbon Centers in Hexagonal Boron Nitride Open
A key advantage of utilizing van‐der‐Waals (vdW) materials as defect‐hosting platforms for quantum applications is the controllable proximity of the defect to the surface or the substrate allowing for improved light extraction, enhanced co…
View article: Magnon gap excitations and spin-entangled optical transition in van der Waals antiferromagnet NiPS3
Magnon gap excitations and spin-entangled optical transition in van der Waals antiferromagnet NiPS3 Open
Optical magneto-spectroscopy methods (Raman scattering, far-infrared transmission, and photoluminescence) have been applied to investigate the properties of the NiPS3 semiconducting antiferromagnet. The fundamental magnon gap excitation in…
View article: Dielectric environment sensitivity of carbon centres in hexagonal boron nitride
Dielectric environment sensitivity of carbon centres in hexagonal boron nitride Open
A key advantage of utilizing van der Waals materials as defect-hosting platforms for quantum applications is the controllable proximity of the defect to the surface or the substrate for improved light extraction, enhanced coupling with pho…
View article: Spin-defect characteristics of single sulfur vacancies in monolayer MoS2
Spin-defect characteristics of single sulfur vacancies in monolayer MoS2 Open
Single spin-defects in 2D transition-metal dichalcogenides are natural spin-photon interfaces for quantum applications. Here we report high-field magneto-photoluminescence spectroscopy from three emission lines (Q1, Q2, and Q*) of He-ion i…
View article: Controlled coherent-coupling and dynamics of exciton complexes in a MoSe<sub>2</sub> monolayer
Controlled coherent-coupling and dynamics of exciton complexes in a MoSe<sub>2</sub> monolayer Open
Quantifying and controlling the coherent dynamics and couplings of optically active excitations in solids is of paramount importance in fundamental research in condensed matter optics and for their prospective optoelectronic applications i…
View article: Coherent imaging and dynamics of excitons in MoSe$_2$ monolayers epitaxially grown on hexagonal boron nitride
Coherent imaging and dynamics of excitons in MoSe$_2$ monolayers epitaxially grown on hexagonal boron nitride Open
Using four-wave mixing microscopy, we measure the coherent response and ultrafast dynamics of excitons and trions in MoSe$_2$ monolayers grown by molecular beam epitaxy on thin films of hexagonal boron nitride. We assess inhomogeneous and …
View article: Controlled coherent-coupling and dynamics of exciton complexes in a MoSe$_2$ monolayer
Controlled coherent-coupling and dynamics of exciton complexes in a MoSe$_2$ monolayer Open
Quantifying and controlling the coherent dynamics and couplings of optically active excitations in solids is of paramount importance in fundamental research in condensed matter optics and for their prospective optoelectronic applications i…
View article: Excitons and trions in WSSe monolayers
Excitons and trions in WSSe monolayers Open
The possibility of almost linear tuning of the band gap and of the electrical and optical properties in monolayers (MLs) of semiconducting transition metal dichalcogenide (S-TMD) alloys opens up the way to fabricate materials with on-deman…
View article: High-Angular Momentum Excitations in Collinear Antiferromagnet FePS<sub>3</sub>
High-Angular Momentum Excitations in Collinear Antiferromagnet FePS<sub>3</sub> Open
We report on magneto-optical studies of the quasi-two-dimensional van der Waals antiferromagnet FePS3. Our measurements reveal an excitation that closely resembles the antiferromagnetic resonance mode typical of easy-axis antiferromagnets;…