Nachwuchskarrieren am IKZ

Wissenschaftliche Karrieren

Das IKZ bietet eine Ausbildung auf hohem Niveau mit einem tiefen Verständnis für wissenschaftliche Konzepte, die für die Wettbewerbsfähigkeit in der akademischen Welt unerlässlich sind. Andererseits bietet das IKZ Studierenden und jungen Wissenschaftlern die Möglichkeit, ihr Fachgebiet zu erweitern und verschiedene Fähigkeiten zu entwickeln, um alternative Karrierewege erfolgreich zu beschreiten. Im Folgenden stellen sich Doktoranden und PostDocs vor und beschreiben ihre Forschungsgebiete und Interessen, die sie am IKZ verfolgen.

Unsere Nachwuchswissenschaftlerinnen und -wissenschaftler stellen sich vor

Aykut Baki

Aykut hat Materialwissenschaften and der Universität Stuttgart in Kooperation mit dem Max-Planck-Institut für Festkörperforschung studiert. Während seiner Tätigkeit bei der 3M Deutschland GmbH in Seefeld (Bayern), entwickelte er komplexe Sinterprozesse für Dentalkeramiken. Während seines Masterstudiums an der TU Berlin und dem HZB untersuchte er Perowskit-Oxide für Anwendungen in der Energiegewinnung. Am IKZ ist er verantwortlich für das Wachstum von SrTiO3 Dünnfilmen mittels MOVPE und der Analyse des resistiven Schaltens.

Sektion: Dünne Oxidschichten

LinkedIn: linkedin.com/in/aykut-baki-a3a252138/
Xing: xing.com/profile/Aykut_Baki/cv

Kontakt

Aykut Baki

Tel. +49 30 6392 3043

E-Mail

Laura Bogula

Nach einem Studium der Physik an der Humboldt-Universität zu Berlin und einem Forschungsaufenthalt an der Nanyang Technological University (Singapore), begann Laura ihre Doktorarbeit an der Schnittstelle zwischen den Sektionen "Experimentelle Charakterisierung" und "Dünne Oxidschichten" am IKZ.

Mit dreidimensionaler Röntgenbeugung, unter Verwendung von Synchrotronstrahlung, untersucht sie Realraumstruktur und Domänenmuster von verspannten ferroelektrischen (K,Na)NbO3-dünnen Schichten, insbesondere deren thermisch induzierte Phasenübergänge. Mittels Kühl-/Heizzusatz können Messungen bei verschiedenen Temperaturen durchgeführt und die Phasenübergänge in situ beobachtet werden. Darüber hinaus arbeitet sie, mit großem Interesse für die theoretische Physik, auch an numerischen Simulationen der Röntgenbeugungsdaten, um die Strukturmodelle theoretisch zu bestätigen.

LinkedIn: linkedin.com/in/laura-bogula-494777131/
Xing: xing.com/profile/Laura_Bogula/cv

Laura Bogula, Leonard von Helden, Carsten Richter, Michael Hanke, Jutta Schwarzkopf, Martin Schmidbauer
Ferroelectric phase transitions in multi-domain K0.9Na0.1NbO3 epitaxial thin films
Nano Futures 4 035005 (2020)
DOI: 10.1088/2399-1984/ab9f18

Martin Schmidbauer, Laura Bogula, Bo Wang, Michael Hanke, Leonard von Helden, Adriana Ladera, Jian-Jun Wang, Long-Qing Chen and Jutta Schwarzkopf
Temperature dependence of three-dimensional domain wall arrangement in ferroelectric K0.9Na0.1NbO3 epitaxial thin films
J. Appl. Phys. 128, 184101 (2020)
DOI: 10.1063/5.0029167

Kontakt

Laura Bogula

Tel. +49 30 6392 3236

E-Mail

Elena Castellano Hernández

In the project of her Ph.D., Elena is developing new visible lasers by studying novel laser materials and their performance as gain media for solid-state lasers (SSLs). Visible lasers are highly demanded in science, industry, medicine, and daily life applications. Due to the lack of semiconductor lasers emitting in the green to orange region, SSLs are the simplest efficient and cost-efficient alternative to cover the demand of these wavelengths. Furthermore, rare-earth-doped SSLs become advantageous in terms of beam quality, robustness, handling, and potential miniaturization. Terbium active ions are outstanding candidates for laser emission at green and especially at yellow wavelengths, otherwise difficult to achieve.

Her research activities are focus on the development of terbium-based materials as potential candidates for visible laser emission. Due to the strong influence of the host lattice on the optical properties and the laser behavior of terbium ions, the study of different host materials brings the possibility of novel laser systems, capable to reach new emission wavelengths with improved efficiency and optomechanical properties. To understand terbium ions at a physical fundamental level, she carries out a systematic characterization of key terbium-doped materials. Hence, she employs several technics such as fluorescence and absorption detection at room and low temperature at wavelengths from UV to the mind-IR, time resolved characterization in nanosecond regimes, and other advanced technics such as evaluation of excited-state absorption. Furthermore, the central point of her research consists of evaluating these novel materials as laser gain media. Therefore, she has expertise in designing and developing of SSLs, as well as in laser characterization and optimization. This study has established diode-pumped terbium-lasers as the simplest and most efficient approach to achieve direct emission in the yellow range.

Sektion Kristalline Materialien für Photonik, Zentrum für Lasermaterialien

Elena Castellano-Hernández, Sascha Kalusniak, Philip W. Metz, Christian Kränkel
Diode-Pumped Laser Operation of Tb3+:LiLuF4 in the Green and Yellow Spectral Range
Laser Photon. Rev., 14 (2) 2020
DOI: 10.1002/lpor.201900229

Elena Castellano-Hernández, Philip W. Metz, Maxim Demesh, Christian Kränkel
Efficient directly emitting high-power Tb3+:LiLuF4 laser operating at 587.5 nm in the yellow range
Opt. Lett., 43 (19) 2018
DOI: 10.1364/OL.43.004791

Elena Castellano-Hernández, E. Damiano, M. Tonelli, Christian Kränkel
Laser emission of Tb3+:BaY2F8 at 581.1 nm in the yellow range
Presented at Europhoton Conference, talkWe-A3.3 (2020), Virtual

Sascha Kalusniak, Elena Castellano-Hernández, H. Tanaka, Christian Kränkel
UV-pumped visible Tb3+-lasers
Opt. Lett., 45 (22) 2020
DOI: 10.1364/OL.411072

Maxim Demesh, Alexander Mudryi, Anatoliy Pavlyuk, Elena Castellano-Hernández, Christian Kränkel, Nikolay Kuleshov
Cross sections and transition intensities of Tb3+ in KY(WO4)2
OSA Continuum, 2 (4) 2019
DOI: 10.1364/OSAC.2.001378

Kontakt

Elena Castellano Hernández

Tel. +49 30 6392 3054

E-Mail

Arved Enders-Seidlitz

Arved arbeitet seit Juli 2020 als Doktorand im NEMOCRYS Projekt von der Gruppe Modellexperimente am IKZ. Schwerpunkt seiner Arbeit ist die Entwicklung und Validierung von Multiphysik-Computersimulationen für Kristallzüchtungsprozesse unter Verwendung von Open-Source Software. Bei Interesse finden Sie weitere Informationen zu seiner Forschung bei ResearchGate und auf LinkedIn.

Sektion Fundamentale Beschreibung, Nachwuchs-Forschungsgruppe "Modellexperimente"

ResearchGate: researchgate.net/profile/Arved_Enders-Seidlitz2
LinkedIn: linkedin.com/in/arved-enders-seidlitz-465830176/

Kontakt

Arved Enders-Seidlitz

Tel. +49 30 6392 3129

E-Mail

Anastasiia Kochan (geb. Uvarova)

Anastasiia's mission is to develop gain materials for lasers with emission wavelengths in the 1 µm and 3 µm spectral range. Both are of high interest and possess a wide range of applications in materials processing, medical treatment and environmental monitoring. In particular cubic sesquioxide crystals enabled excellent laser performance when doped with Yb3+ and Er3+. However, the growth of sesquioxides is very challenging due to their high melting temperatures of more than 2400°C.

Her current activities include the development of a growth process for high quality rare-earth doped laser by the optical floating zone method (OFZ), the spectroscopic investigation of these crystals and to perform basic laser experiments.
During OFZ growth, a ceramic rod is molten by intense light and solidifies in form of a single crystal. As the molten zone is held together by surface tension, it avoids the use of expensive noble metal crucibles and insulations and enables a free choice of the growth atmosphere without restrictions imposed by crucible and insulation.
Our initial spectroscopic results reveal superior properties of OFZ crystals as compared to previous crystals grown from rhenium crucibles by the heat exchanger method (HEM) and corresponding laser experiments will be performed in the near future.

Sektion Kristalline Materialien für Photonik, Zentrum für Lasermaterialien

Xing: xing.com/profile/Anastasia_Uvarova2/
LinkedIn: linkedin.com/in/anastasia-uvarova

Kontakt

Anastasiia Kochan (geb. Uvarova)

Tel. +49 30 6392 3122

E-Mail

Palvan Seyidov

Gallium oxide (Ga2O3) is emerging as a viable candidate for certain classes of power electronics, solar blind UV photodetectors, solar cells, and sensors with capabilities beyond existing technologies due to its large bandgap. Palvan´s scientific interest include the charge and spin transport physics of device related gallium oxide (Ga2O3) bulk crystals and homoepitaxial layers. To understand the electrical properties of gallium oxide crystals grown at the IKZ, he uses conductivity and Hall effect measurements (20-1100K), deep-level transient and optical  spectroscopy (20-800K) as well as for optical characterization he uses transmission / reflection spectrometers in the wavelength range from 120nm to 100um and micro-Raman spectrometer with 6 excitation wavelengths (325-785 nm).

Sektion Experimentelle Charakterisierung

LinkedIn: linkedin.com/in/palvan-seyidov-640708187

Kontakt

Palvan Seyidov

Tel. +49 30 6392 3086

E-Mail