Výsledky vyhledávání - "Kempisty, Pawel"

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Exploration of stable atomic configurations in graphene-like BCN systems by Bayesian optimization

Autor: Hara, Taichi, Kusaba, Akira, Kangawa, Yoshihiro, Kuboyama, Tetsuji, Bowler, David, Kawka, Karol, Kempisty, Pawel

h-BCN is an intriguing material system where the bandgap varies considerably depending on the atomic configuration, even at a fixed composition. Exploring stable atomic configurations in this system is crucial for discussing the energetic formability

Externí odkaz: http://arxiv.org/abs/2411.04758

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Polarization spontaneous and piezo: fundamentals and their implementation in ab initio calculations

Autor: Strak, Pawel, Kempisty, Pawel, Sakowski, Konrad, Piechota, Jacek, Grzegory, Izabella, Monroy, Eva, Kaminska, Agata, Krukowski, Stanislaw

Fundamental properties of spontaneous and piezo polarization are reformulated and critically reviewed. It was demonstrated that Landau definition of polarization as a dipole density could be used to the infinite systems. The difference between the bu

Externí odkaz: http://arxiv.org/abs/2407.01134

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Augmentation of the Electron Counting Rule with Ising Model

Autor: Kawka, Karol, Kempisty, Pawel, Sakowski, Konrad, Krukowski, Stanislaw, Bockowski, Michal, Bowler, David, Kusaba, Akira

Publikováno v: J. Appl. Phys. 135, 225302 (2024)

On semiconductor growth surfaces, surface reconstructions appear. Estimation of the reconstructed structures is essential for understanding and controlling growth phenomena. In this study, the stability of a mixture of two different surface reconstru

Externí odkaz: http://arxiv.org/abs/2402.06140

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Coulomb contribution to Shockley-Read-Hall (SRH) recombination

Autor: Sakowski, Konrad, Strak, Pawel, Kempisty, Pawel, Piechota, Jacek, Grzegory, Izabella, Perlin, Piotr, Monroy, Eva, Kaminska, Agata, Krukowski, Stanislaw

Defect-mediated nonradiative recombination, known as Shockley-Read-Hall (SRH) recombination is reformulated. The introduced model considers Coulomb attraction between charged deep defect and the approaching free carrier, showing that this effect may

Externí odkaz: http://arxiv.org/abs/2310.11823

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Macrosteps dynamics and the growth of crystals and epitaxial layers

Autor: Krukowski, Stanislaw, Sakowski, Konrad, Strak, Paweł, Kempisty, Paweł, Piechota, Jacek, Grzegory, Izabella

Publikováno v: Progress in Crystal Growth and Characterization of Materials - 6 September 2022; 68 :100581

Step pattern stability of the vicinal surfaces during growth was analyzed using various surface kinetic models. It was shown that standard analysis of the vicinal surfaces provides no indication on the possible step coalescence and therefore could no

Externí odkaz: http://arxiv.org/abs/2203.11825

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Polarization doping ab initio verification of the concept charge conservation and nonlocality

Autor: Ahmad, Ashfaq, Strak, Pawel, Kempisty, Pawel, Sakowski, Konrad, Piechota, Jacek, Kangawa, Yoshihiro, Grzegory, Izabella, Leszczynski, Michal, Zytkiewicz, Zbigniew R., Muziol, Grzegorz, Monroy, Eva, Krukowski, Stanislaw, Kaminska, Agata

In this work, we study the emergence of polarization doping in AlxGa1-xN layers with graded composition from a theoretical viewpoint. We demonstrate that the charge conservation law applies for fixed and mobile charges separately, leading to nonlocal

Externí odkaz: http://arxiv.org/abs/2106.01029

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