Dirk R. Englund

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cond-mat.mtrl-sci2025

On-chip high-order parametric downconversion in the excitonic Mott insulator Nb $_{3}$ Cl $_{8}$ for programmable multiphoton entangled states

Dmitry Skachkov, Dirk R. Englund, Michael N. Leuenberger

Spontaneous parametric downconversion (SPDC) and four-wave mixing in $χ^{(2)}$ and $χ^{(3)}$ media underpin most entangled-photon sources, but direct generation of higher-order ent…

cond-mat.mtrl-sci2025

Er $_{Al}$ :Al $_{2}$ O $_{3}$ for Telecom-Band Photonics: Electronic Structure and Optical Properties

Mahtab A. Khan, Jayden D. Craft, Hari P. Paudel +3

Er-doped Al $_{2}$ O $_{3}$ is a promising host for telecom-band integrated photonics. Here we combine ab initio calculations with a symmetry-resolved analysis to elucidate substitutional…

cond-mat.mtrl-sci2024

Multiferroic Dark Excitonic Mott Insulator in the Breathing-Kagome Lattice Material Nb $_{3}$ Cl $_{8}$

Mahtab A. Khan, Naseem Ud Din, Dmitry Skachkov +2

Flat electronic bands strongly enhance Coulomb interactions and can stabilize unconventional insulating states. Motivated by the recent discovery of flat bands in breathing Kagome…

On-chip high-order parametric downconversion in the excitonic Mott insulator Nb3​Cl8​ for programmable multiphoton entangled states

ErAl​:Al2​O3​ for Telecom-Band Photonics: Electronic Structure and Optical Properties

Multiferroic Dark Excitonic Mott Insulator in the Breathing-Kagome Lattice Material Nb3​Cl8​

On-chip high-order parametric downconversion in the excitonic Mott insulator Nb $_{3}$ Cl $_{8}$ for programmable multiphoton entangled states

Er $_{Al}$ :Al $_{2}$ O $_{3}$ for Telecom-Band Photonics: Electronic Structure and Optical Properties

Multiferroic Dark Excitonic Mott Insulator in the Breathing-Kagome Lattice Material Nb $_{3}$ Cl $_{8}$