Chapter on Phonon Properties published in book Gallium Oxide
In this chapter, written by members of our team we present and discuss the complete set of infrared-active phonon modes in monoclinic-symmetry crystal modification gallium oxide. This chapter attempts to summarise the current state of knowledge about the optical phonon mode propoerties and their coupling with free charge carriers in gallium oxide with monoclinic crystal structure.
You can find the book at springer.com.
April 2019 - Inside front cover in Journal of Materials Chemistry C
Our paper on the anomalous optical conductivity dispersion of electrically conducting polymers determiend by ultra-wide spectral range ellipsometry combined with a Drude-Lorentz model is selected as inside front cover in the April issue of Journal of Materials Chemistry C.
April 2019 - Eva Bittrich from Leibniz Institute of Polymer Research Dresden is visiting
March 2019 - The 2nd Swedish Terahertz Workshop
On 28th of March the Terahertz Materials Analysis Center (THeMAC) organized the 2nd Swedish Terahertz Workshop. About 40 scientists from Stockholm University, Chalmers University of Technology, KTH, Gothenburg University, University of Nebraska - Lincoln, US Naval Research Lab, State University of New Mexico, University of California at Santa Barbara, University of North Carolina Charlotte, NEST at Istituto Italiano di Tecnologia and Linköping University gathered together to discuss THz materials research and collaborative efforts within THeMAC. The workshop was organized in four sessions and covered a broad variety of materials, techniques and applications including THz Components and Infrastructures, New Materials and Phenomena, Bio Applications and Semiconductors and Metamaterials. Detailed program can be found here.
March 2019 - Nerijus Armakavicius is awarded PhD degree in Semiconductor Materials
March 2019 - Nerijus Armakavicius PhD thesis nailing
March 2019 - We welcome Muhammad Nawaz as an adjunct professor
October 2018 - We welcome Rosalia Delgado and Alexis Papamichail as new PhD students in C3NiT
September 2018 - We welcome Dat Tran, a new PhD student in C3NiT
June 2018 - Nerijus Armakavicius is recipient of the 2018 E-MRS Graduate Student Award
June 2018 - Vanya Darakchieva receives PI support from AFM
April 2018 - Alyssa Mock is the recipient of the 2018 UNL College of Engineering Outstanding Doctoral Dissertation Award
March 2018 - Vanya Darakchieva recieves a framework grant for Strategic Research on Materials for Energy Applications
Next generation semiconductor materials
January 2017 - Vanya Darakchieva recieves a consolidator grant by the Swedish Research Council
November 2016 - Chamseddine Bouhafs is a awarded PhD degree in Semiconductor Materials
September 2016 - We welcome Prof. Mathias Schubert as a guest professor
May 2016 - Vannya Darakchieva is appointed Adjunct Professor at the University of Nebraska-Lincoln
March 2016 - The Swedish Terahertz Workshop and THeMAC Inauguration
January 2016 - One step closer to our dream - Vanya Darakchieva receives an Infrastructure Fellow Award from the Swedish Foundation for Strategic Research
August 2015 - Record mobility in AlGaN/GaN HEMT measured by THz cavity-enhanced optical Hall effect
August 2015 - Mengyao Xie from Universidad Politécnica de Madrid is visiting
Mengyao Xie, a post doc fromUniversidad Politécnica de Madrid and a former member of our group, is visiting for 1 month. She is working on determination of free-charge carrier properties of InGaN films and nanocolumns by infrared and THz spectroscopic ellipsometry.
July 2015 - It's working, it's working....
We are very excited to demonstrate the first measurements using our new THz ellipsometer. We have successfuly measured THz cavity-enhanced optical Hall efect in one monolayer graphene grown on Si-face 4H-SiC.
June 2015 - Sean Knight from the University of Nebraska-Lincoln is visiting
Sean Knight, a master student from University of Nebraska-Lincoln is visitting for 1 month. He is working together with Tino Hofmann, Chams Bouhafs, Vallery Stanishev, Nerijus Armakavicius and Philipp Kuehne on in-situ measurements of ambient effects on the free-charge carrier properties of graphene using our new THz ellipsometer.
May 2015 - Professor Mathias Schubert recieves the Honorary Doctor Degree from Linköping University
Prof. Mathias Schubert from University of Nebraska-Lincoln (UNL), a world-leading expert in the fields of optics and materials science and a long-term collaborator with our group, receives the Honorary Doctor Degree from Linköping University.
Mathias Schubert has made seminal contributions to the fields of spectroscopy, condensed matter physics and materials science and technology. He has pioneered infrared, far-infrared and terahertz spectroscopic ellipsometry, and invented the optical Hall effect. These techniques helped his team and researchers world-wide to develop and implement novel materials for blue and white light emitting diodes, organic solar cells, high-speed processor technologies and bio-, and chemical sensing. Mathias Schubert has since 2000 participated along with researchers from our group in several research projects and large initiatives that resulted in numerous doctoral theses, scientific papers and patents. He has played a key role in the establishment of the infrared and terahertz ellipsometry laboratories at Linköping University, and the exchange of students and senior researchers between Sweden and USA. Thanks to the fruitful collaboration with the group of Prof. Schubert, Linköping University is currently recognized as one of the leading centers on spectroscopic ellipsometry in the world.
March 2015 - Professor Tino Hofmann is named Marie Curie Fellow and VINNMER Fellow.
The Fellowship is supported by the EU Marie Curie Action and Sweden's innovation agency VINNOVA to progress tight collaboration between the University of Nebraska-Lincoln, the University of Linköping, Sweden, and private enterprises in the US and Sweden. The goal of this collaboration between world-leading experts in growth and characterization of graphene and group-III nitride materials in Sweden with experts in the Center of Nanohybrid Functional Materials at UNL is to design, manufacture, and characterize graphene-metal nanostructure hybrid materials for novel terahertz frequency devices.Tino Hofmann will join our group from March 2015.
February 2015 - Philipp Kuehne recieves the 2015 Folsom Distinguished Doctoral Dissertation Award
January 2014 - Vanya Darakchieva receives a Future Research Leaders award from the Swedish Foundation for Strategic Research
Vanya Darakchieva receives 10 MSEK Future Research Leaders award from the Swedish Foundation for Strategic Research (SSF) for her project THz ellipsometry of advanced materials for high-speed electronics. The goal of the project is to build a unique THz ellipsometry instrumentation and use it to explore the mechanisms that generate and control the free-charge carrier properties in epitaxial layers of In(Ga,Al)N and graphene. The research aims at enabling the desired transport properties in these materials in order to achieve substantial advance towards high-speed and THz-frequency large scale processor technologies. The THz ellispometer is a revolutionary instrument and will be the only one of its kind in Europe. It is a noncontact, non-destructive method of measuring electrical transport properties with substantial advantages over conventional electrical measurements. It allows differentiation of electronic transport properties of differently conductive channels in multi-layered or inhomogeneous samples, with no physical contact which can result in surface damage or sample contamination. The new ellipsometer will make possible the measurement of THz transistor devices at their operating frequencies. The THz ellipsometry has greater potential to advance our understanding of transport properties not only in graphene but, for example, in multiferroic tunnel structures, magnetoelectric heterostructures, ferromagnetic and ferroelectric polymer structures, magnetic and piezoelectric hybrid nanostructures and solar cell materials.
For more information click here.