TMD2DCOR – Metalické 2D dichalkogenidy prechodných kovov: príprava, štúdium vlastností a korelované stavy
Fabrication, physics and correlated states in metallic 2D transition metal dichalcogenides
Program: SRDA
Project leader: Dr. rer. nat. Hulman Martin
Annotation: The discovery of graphene in 2004 has brought a massive interest of scientists active in condensed-matter physicson research of 2D materials. Even though these materials have a long history starting already in the twenties of the20th century, the past years have seen an intensive renascence of interest in 2D materials. Ultra-thin samples ofmany 2D materials have been successfully prepared with electronic properties that may exhibit correlatedelectronic phenomena such as charge density waves and superconductivity. One of the well-studied families of the2D materials are transition metal dichalcogenides (TMDs). TMDs consist of hexagonal layers of metal atomssandwiched between two layers of chalcogen atoms with a MX2 stoichiometry.In this project, we focus on those materials from the TMD family that exhibit strongly correlated electronic states:NbSe2, TiSe2, TaS2, TaSe2 and PtSe2. The goal of the project is to prepare ultrathin (≤ 10 nm) layers and bulksamples and characterise them thoroughly in terms of the thickness, crystallinity, homogeneity, optical andelectronic properties. A special attention will be paid to charge density wave states and superconductivity in thesematerials and how they evolve with the sample thickness, doping, external electric and magnetic fields and detailsof the growth process.The scientific program also aims at preparing heterostructures built up of these materials as well as hybrid systemscombining TMDs with other materials. This research also includes a detailed characterisation of heterostructures toprovide a feedback to optimise the growth process.
Duration: 1.7.2020 – 30.6.2023
Perovskitovské tenké vrstvy a štruktúry vhodné pre modern elektroniku a senzoriku
Perovskite thin films and structures for modern electronics and sensorics
Program: VEGA
Project leader: RNDr. Španková Marianna PhD
Annotation: We prepare different types of perovskite films -ferromagnetic, superconducting, dielectric- (thickness up to 100nm) and micro- and nano structures. YBa2Cu3Ox superconducting microstrips will be irradiated by electrons (30keV) with the aim to create channels for easy vortex motion. We also focus on detailed study of Si/dielectric layerinterface using unconventional materials (SrO, TiN) with the aim to enable epitaxial growth of buffer layersnecessary for realization of uncooled microbolometers on the base of La0.67Sr0.33MnO3 films working and atfrequencies in THz range. Beside the Bi4Ti3O12 studied so far different types of other buffer layers will be testedin order to develop new types of bolometers. We continue in study of perovskite superconductor S/ferromagnet Fand S/F/S structures with the aim to resolve the phenomenom of S/F thin films interaction (proximity effect). Theimplementation of pi-type Josephson junction in digital and quantum circuits may solve some problems of superconducting qubits.
Duration: 1.1.2018 – 31.12.2021
2D materiály a iónové kvapaliny pre využitie v mikroelektronike a senzorike
2D materials and ionic liquids in microelectronics and sensors
Program: VEGA
Project leader: Mgr. Sojková Michaela PhD.
Annotation: Two-dimensional (2D) materials and nanoparticles are a very hot topic. Project proposal builds on our knowledgegathered so far and it is focused on fabrication of 2D materials and nanoparticles (using ionic liquids ILs) and thecombination of three materials. The aim of the project is the fabrication of experimental materials and devices forsensors. Concerning 2D materials, we will focus on the optimization of the growth parameters of thin films ofselected materials. In field of nanoparticles, we will continue to prepare facetted metallic and carbonnanoparticles. Facetted ones will be used for the decoration of thin film 2D materials influencing thus the electricaltransport within the film, which is applicable e. g. in gas sensors. Carbon nanoparticles are fluorescent whichimplies their suitability for the use in fluorescence microscopy. The ionic liquids will be used both for preparationof nanoparticles in vacuum and also for formation of EDL gate to control the electrical transport in 2D materials.
Duration: 1.1.2017 – 31.12.2020
MOSSLE – Modifikácia YBCO tenkovrstvových štruktúr nízkoenergetickými elektrónmi pre supravodivú elektroniku
Modification of YBCO thin film structures using low energy electron beam processing for superconducting electronics
Program: SRDA
Project leader: Ing. Chromik Štefan DrSc.
Annotation: The proposed project deals with the effect of low energy electron irradiation of YBCO microstrips with the aim to fabricate channels for easy vortex motion. Detailed analyses will be focused on the subtle balance of many processes involving kinetic (kick-off) process, thermal activation of oxygen as well as ordering of Cu-O chains by incident electrons. The study of these phenomena together with the effect on introducing of artificial pinning in the illuminated channels, having influence on the dynamics of the vortices in the channel, lead to the contribution to basic reserach and also to the realization of functional model structure for the application in superconducting electronics.
Duration: 1.7.2017 – 31.12.2020