- Warsaw-4-PhD School
- Doctoral studies
Events
We cordially invite you to attend the 8th European Conference on Crystal Growth (Warsaw, July 21-25) and the 4th European School on Crystal Growth (Jachranka, July 17-21), co-organized by Unipress as one of the main organizers. The events will bring together leading researchers in the field of crystal growth and characterization, providing an excellent opportunity to exchange knowledge and experience. Detailed information on the program, including a list of sessions, invited talks and abstract submission deadlines, can be found on the official website. |
Study of liquid crystals with nanoparticles
Thursday, 11 April 2024 09:32 |
Research carried out at our Institute in the NL10 laboratory has shown interesting properties of nanocollides based on a liquid crystal (MBBA) with the addition of BaTiO3 nanoparticles. Previous work by this group has already shown that adding a minimal amount of nanoparticles fundamentally changes the properties of the system. This time, the properties were examined in the direction perpendicular to the long axis of the molecules. The studied nanocolloids showed that in the isotropic phase a pre-transition effect of the dielectric constant is observed, which can be related to the so-called negative specific heat. In the nematic phase, which undergoes supercooling, a very strong signature of passing the melting point appears despite the lack of crystallization. The very strong pre-melting effect in the solid phase is explained on the basis of a concept combining the Lipovsky model for nanolayers of liquids between two surfaces, and the hypothesis of the appearance of negative pressures in these layers - leading to the Mossotti Catastrophe behavior. This work also shows for the first time a simple parameterization of changes in electrical permittivity in the low-frequency region (which was a previously unsolved problem) and a previously unknown critical anomaly of the dissipation coefficient, i.e. D = tgδ related to energy dissipation. Th work is published in Open Access paper: A. Drozd-Rzoska, J. Łoś, S.J. Rzoska, The dominance of pretransitional effects in the liquid crystal based nanocolloids: nematogenic MBBA with the transverse permanent dipole moment and BaTiO3 nanoparticles, Nanomaterials 2024, 14, 655 (Impact Factor: 5.3). Fig. Temperature evolutions for tgδ loss (energy dissipation) factor for frequency f=12Hz in MBBA and related nanocolloids with BaTiO3 nanoparticles. The solid green and blue curves are for the critical-like empirical parametrization D(T)=tgδ=δ*+d(T-Tδ)+D(T-Tδ)Ѱ with exponent Ѱ≈4. Note the link of this magnitude to the power loss: P=ωCV2tgδ. Publiczna obrona rozprawy doktorskiej mgr inż. Natalii Fiuczek
Wednesday, 03 April 2024 14:28 |
Dnia 15 kwietnia 2024 r. (poniedziałek) o godz. 12:00 w sali seminaryjnej Instytutu Wysokich Ciśnień Polskiej Akademii Nauk w Warszawie, ul. Sokołowska 29/37, odbędzie się publiczna obrona rozprawy doktorskiej mgr inż. Natalii Fiuczek. Temat rozprawy: „Mechanizm trawienia elektrochemicznego GaN oraz jego zastosowanie w inżynierii urządzeń optoelektronicznych” Rozprawa doktorska oraz jej recenzje dostępne są na stronie BIP IWC PAN Unipress Thursday Seminar
Wednesday, 03 April 2024 12:40 |
What is SCAATTM? How can we increase the 4-inch GaN bulk crystal diameter if the Ni-based superalloys material properties cannot withstand higher pressures? Are 8-inch bulk GaN crystals a dream or reality? These questions will be adressed by Dr. Yuji Kagamitani from Mitsubishi Chemical in a talk on “Acidic Ammonothermal Growth of Bulk GaN” during next Unipress Thursday seminar. Join us online via Zoom platform on Thursday, April 25, 2024 at 3:00 pm. To get the link to Zoom meeting, please contact us at dyrekcja@unipress.waw.pl VIII Winter Workshop Kalatówki 2024
Friday, 22 March 2024 11:13 |
VIIIth Winter Workshop Kalatówki 2024 on Physics and Applications of Nitride Semiconductors will be organized on April 7-12, 2024 in Zakopane (Poland). The Winter Workshop Kalatówki gathers researchers from the Institute of High Pressure Physics Polish Academy of Sciences and from the collaborating scientific institutes. It serves as a platform for the exchange of information and ideas among the laboratories of the Institute over the years. Scientific topics discussed encompass the physics and technology of AlInGaN semiconductor quantum structures, particularly within the realm of light emitters. Epitaxy, device processing and theoretical modelling will be highlighted for better understanding of the underlying physics and paving the way to novel concepts realization both in optoelectronics and nitride-based electronics. This year, we will host many prominent nitride experts:
Save the date for ICNS-15!
Wednesday, 20 March 2024 12:00 |
International Conference on Nitride Semiconductors - ICNS-15 will be held in Malmö in Sweden from July 6-11, 2025. ICNS-15 will present high-impact scientific and technological advances in materials and devices based on group-III nitride semiconductors, and feature plenary sessions, parallel topical sessions, poster sessions and an industrial exhibition. The conference is chaired by Vanya Darakchieva, Lars Samuelson and Piotr Perlin. ICNS-15 will celebrate the achievements of Profs. Bo Monemar and Tadek Suski as honorary chairs. Save the date for this exciting event! 10th Workshop on the Physics and Technology of Semiconductor Lasers
Friday, 23 February 2024 14:06 |
10th Workshop on the Physics and Technology of Semiconductor Lasers will take place from 13th to 18th October 2024 in Sopot, Poland. This is a must-attend event for everyone interested in semiconductor laser physics and technology. Kindly mark these dates in your calendar! The first announcement can be downloaded here. Abstract submission deadline - 30th June 2024
More information about the scope of the 10th Workshop on the Physics and Technology of Semiconductor Lasers, its Program Committee, Honorary Chair and the Workshop venue can be found at: https://10thlaserworkshop.unipress.waw.pl/ |
Impact of impurity phase and high pressure growth on a stoichiometric iron-based superconductor
Thursday, 04 April 2024 14:21 |
Generally, the presence of impurity phases in a superconductor reduces its properties. Dr. Singh's research group (NL-6) has just published a new study in the Journal of Physics and Chemistry of Solids (Impact factor: 4.0) that shows the impact of impurities on high-Tc iron-based superconductors grown under ambient and applied pressure conditions. The conclusion of this research is that the high-pressure synthesis of the stoichiometric CaKFe4As4 (1144) superconductor increases the transition temperature (Tc) by 2K and the critical current density (Jc) by one order of magnitude in the whole magnetic field range of 9 T as compared to that of the 1144 bulks prepared by conventional synthesis method at ambient pressure (CSP). Moreover, the superconducting onset transition temperature of this stoichiometric CaKFe4As4 (1144) family is robust with the presence of the common 122 (CaFe2As2 or KFe2As2) impurity phases. This study is published by “Manasa Manasa, Mohammad Azam, Tatiana Zajarniuk, Ryszard Diduszko, Tomasz Cetner, Andrzej Morawski, Andrzej Wiśniewski, Shiv J. Singh” entitled “Effect of impurity phase and high-pressure synthesis on the superconducting properties of CaKFe4As4” DOI: https://doi.org/10.1016/j.jpcs.2024.111996
Figure: The variation of (a) an amount of the impurity CaFe2As2 phase, (b) the onset transition temperature Tconset, (c) the room temperature resistivity (ρ300K), (d) Residual resistivity ratio (RRR = ρ300 K/ρ40 K), (e) transition width (ΔT) and (f) the critical current density (Jc) at 5 K and self-field with respect to CaKFe4As4 bulks prepared by high pressure and high temperature synthesis (HP-HTS) method with 1144 sample prepared by CSP method. Spotlight talk - prof. Eva Monroy
Wednesday, 03 April 2024 13:41 |
The Warsaw Doctoral School in Natural and Biomedical Sciences and the Institute of High Pressure Physics PAS cordially invites you to a SPOTLIGHT TALK "AlGaN nanostructures for far UV-C emitters" given by Prof. Eva Monroy from Quantum Photonics, Electronics and Engineering Laboratory (PHELIQS) of CEA-Grenoble, France When and where: Wednesday, April 24, 2024, 13:00 (duration: 60 min + more) at the IHPP PAS al. Prymasa Tysiąclecia 98, seminar room 2nd floor and online - the link to Zoom meeting and abstract are available here. Gala XIV edycji programu LIDER
Friday, 22 March 2024 13:33 |
Wczoraj, 21 marca 2024, odbyła się uroczysta gala XIV edycji programu LIDER, realizowanego przez Narodowe Centrum Badań i Rozwoju ze środków Ministerstwa Nauki i Szkolnictwa Wyższego. Pamiątkowe dyplomy i symboliczne czeki wręczali laureatom wicepremier, minister cyfryzacji dr Krzysztof Gawkowski, wiceminister nauki i szkolnictwa wyższego prof. dr hab. inż. Marek Gzik oraz p.o. dyrektor NCBR, prof. dr hab. inż. Jerzy Małachowski. Aż dwoje z 41 laureatów programu LIDER pracuje w naszym Instytucie. Są to dr inż. Tomasz Sochacki z Laboratorium Krystalizacji i dr inż. Marta Sawicka z Laboratorium Epitaksji MBE. Jesteśmy dumni, że ci młodzi naukowcy będą realizować tu swoje badania. Zachęcamy do zapoznania się z ich projektami opisanymi w publikacji „XIV edycja Programu LIDER”. Więcej informacji na stronie www. Nabór do XV edycji jest już otwarty i potrwa do 28 kwietnia 2024. Wysokie ciśnienie jest oryginalnym wyróżnikiem fizyków z IWCPAN
Thursday, 21 March 2024 16:52 |
Dlaczego bez fizyków zajmujących się półprzewodnikami nie byłoby współczesnego świata? Jakie perspektywy zawodowe mają polscy fizycy zajmujący się półprzewodnikami? Jak polska szkoła fizyki półprzewodników jest postrzegana na świecie? Na te i inne pytania znajdziecie odpowiedź w najnowszym podcaście z serii „A co PAN radzi?”. Tym razem Profesor Dariusz Jemielniak rozmawia z Profesor Izabellą Grzegory, światowej klasy fizykiem półprzewodników z Instytutu Wysokich Ciśnień. Zapraszamy do wysłuchania najnowszego odcinka z serii „A co PAN radzi?” dostępnego na stronie PAN! Piezoelectric perovskites
Friday, 15 March 2024 13:45 |
Lead halide perovskites are known as efficient materials for solar cells, LED’s, lasers, photodetectors and even γ-detectors. Recently, this long list of applications has been updated by the piezoelectric devices. New publication in ACS Energy Letters (IF=22) titled „The Impact of Piezoelectricity in Low Dimensional Metal Halide Perovskite” S. Rahmany, A. Shpatz Dayan, M. Wierzbowska, A. J. Ong, Y. Li, S. Magdassi, A. I. Y. Tok and L. Etgar, ACS Energy Letters, 1527, 2024 doi: 10.1021/acsenergylett.4c00177 rised with a theoretical contribution from Unipress and joint experimental work in Jerusalem and Singapore ICSM 2024 - dr Shiv Singh organizes a session and delivers an invited talk
Wednesday, 14 February 2024 13:33 |
The 9th International Conference on Superconductivity and Magnetism - ICSM2024 will take place in Turkey from April 27th to May 4th, 2024. Typically, this international conference gathers over 500 participants, making it a highly esteemed event within the superconducting community. This year dr Shiv J. Singh from our Institute, Laboratory of Superconductors, was invited to organize a session focused on iron-based superconductors. The session "Iron-based superconductors (IBS): Fundamental and applied research under ambient and applied pressures" will be composed of eight talks. More information can be found at https://icsmforever.org/scientific-program/co-organizers-and-confirmed-session-chairs/. Dr. Singh will also give an invited talk "Enhancement of transition temperature and critical current density of iron-based superconductors by high-pressure growth" at this conference. As demonstrated by dr Singh's current research, high-pressure growth is crucial in improving the superconducting properties of this high Tc superconductor. This talk will cover the optimization of pressure growth conditions, bulk sample quality, superconducting properties, and granular behavior of these families in relation to ambient and high-pressure synthesis processes. Dr. Singh’s two Ph.D. students, Manasa Manasa, and Mohammad Azam, will also present their work as posters. ICSM2024 conference program can be found here https://icsmforever.org/scientific-program/wrs/ |
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