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1. In-plane anisotropic two-dimensional materials for twistronics

   https://doi.org/10.1088/1361-6528/ad2c53  

   Kim, Hangyel; Kim, Changheon; Jung, Yeonwoong; Kim, Namwon; Son, Jangyup; Lee, Gwan-Hyoung (April 2024, Nanotechnology)

   Abstract In-plane anisotropic two-dimensional (2D) materials exhibit in-plane orientation-dependent properties. The anisotropic unit cell causes these materials to show lower symmetry but more diverse physical properties than in-plane isotropic 2D materials. In addition, the artificial stacking of in-plane anisotropic 2D materials can generate new phenomena that cannot be achieved in in-plane isotropic 2D materials. In this perspective we provide an overview of representative in-plane anisotropic 2D materials and their properties, such as black phosphorus, group IV monochalcogenides, group VI transition metal dichalcogenides with 1T′ and T_dphases, and rhenium dichalcogenides. In addition, we discuss recent theoretical and experimental investigations of twistronics using in-plane anisotropic 2D materials. Both in-plane anisotropic 2D materials and their twistronics hold considerable potential for advancing the field of 2D materials, particularly in the context of orientation-dependent optoelectronic devices. 

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2. An Improved Bound for Plane Covering Paths

   https://doi.org/10.4230/lipics.esa.2025.75  

   A_Akitaya, Hugo; Aloupis, Greg; Biniaz, Ahmad; Bose, Prosenjit; De_Carufel, Jean-Lou; Gavoille, Cyril; Iacono, John; Kleist, Linda; Smid, Michiel; Souvaine, Diane; et al (October 2025, Schloss Dagstuhl – Leibniz-Zentrum für Informatik)

   Benoit, Anne; Kaplan, Haim; Wild, Sebastian; Herman, Grzegorz (Ed.)

   A covering path for a finite set P of points in the plane is a polygonal path such that every point of P lies on a segment of the path. The vertices of the path need not be at points of P. A covering path is plane if its segments do not cross each other. Let π(n) be the minimum number such that every set of n points in the plane admits a plane covering path with at most π(n) segments. We prove that π(n) ≤ ⌈6n/7⌉. This improves the previous best-known upper bound of ⌈21n/22⌉, due to Biniaz (SoCG 2023). Our proof is constructive and yields a simple O(n log n)-time algorithm for computing a plane covering path. 

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3. Chalcophosphate metasurfaces with multipolar resonances and electro-optic tuning

   https://doi.org/10.1039/D4RA05149A  

   Babicheva, Viktoriia E; Rumi, Mariacristina (October 2024, RSC Advances)

   Chalcophosphate metasurfaces exhibit a significant electro-optic shift in multipolar resonances due to large electric-field-induced refractive index changes, obtainable with in-plane or out-of-plane biasing. 

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4. Types of noncovalent bonds within complexes of thiazole with CF ₄ and SiF ₄

   https://doi.org/10.1039/D4CP00057A  

   Scheiner, Steve; Amonov, Akhtam (February 2024, Physical Chemistry Chemical Physics)

   The five-membered heteroaromatic thiazole molecule contains a number of electron-rich regions that could attract an electrophile, namely the N and S lone pairs that lie in the molecular plane, and π-system areas above the plane. 

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5. First-principles prediction of thermal conductivity of bulk hexagonal boron nitride

   https://doi.org/10.1063/5.0210935  

   Guo, Ziqi; Han, Zherui; Alkandari, Abdulaziz; Khot, Krutarth; Ruan, Xiulin (April 2024, Applied Physics Letters)

   Despite its importance, a sophisticated theoretical study of thermal conductivity in bulk h-BN has been lacking to date. In this study, we predict thermal conductivity in bulk h-BN crystals using first-principles predictions and the Boltzmann transport equation. We consider three-phonon (3ph) scattering, four-phonon (4ph) scattering, and phonon renormalization. Our predicted thermal conductivity is 363 and 4.88 W/(m K) for the in-plane and out-of-plane directions at room temperature, respectively. Further analysis reveals that 4ph scattering reduces thermal conductivity, while phonon renormalization weakens phonon anharmonicity and increases thermal conductivity. Eventually, the in-plane and out-of-plane thermal conductivities show intriguing ∼T−0.627 and ∼T−0.568 dependencies, respectively, far deviating from the traditional 1/T relation. 

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