TY - JOUR AU - Rácz, Adél Sarolta AU - Kun, Péter AU - Kerner, Zsolt Gábor AU - Fogarassy, Zsolt AU - Menyhárd, Miklós TI - Tungsten Carbide Nanolayer Formation by Ion Beam Mixing with Argon and Xenon Ions for Applications as Protective Coatings JF - ACS APPLIED NANO MATERIALS J2 - ACS APPL NANO MATER VL - 6 PY - 2023 IS - 5 SP - 3816 EP - 3824 PG - 9 SN - 2574-0970 DO - 10.1021/acsanm.2c05505 UR - https://m2.mtmt.hu/api/publication/34538351 ID - 34538351 LA - English DB - MTMT ER - TY - JOUR AU - Hagymási, Imre AU - Mohd, Isa M.S. AU - Tajkov, Zoltán AU - Márity, K. AU - Oroszlány, László AU - Koltai, János AU - Alassaf, A. AU - Kun, Péter AU - Kandrai, Konrád AU - Pálinkás, András AU - Vancsó, Péter AU - Tapasztó, Levente AU - Nemes Incze, Péter TI - Observation of competing, correlated ground states in the flat band of rhombohedral graphite JF - SCIENCE ADVANCES J2 - SCI ADV VL - 8 PY - 2022 IS - 35 PG - 9 SN - 2375-2548 DO - 10.1126/sciadv.abo6879 UR - https://m2.mtmt.hu/api/publication/33090541 ID - 33090541 LA - English DB - MTMT ER - TY - JOUR AU - Kocsis, Mátyás AU - Zheliuk, Oleksandr AU - Makk, Péter AU - Tóvári, Endre AU - Kun, Péter AU - Tereshchenko, Oleg Evgenevich AU - Kokh, Konstantin Aleksandrovich AU - Taniguchi, Takashi AU - Watanabe, Kenji AU - Ye, Jianting AU - Csonka, Szabolcs TI - In situ tuning of symmetry-breaking-induced nonreciprocity in the giant-Rashba semiconductor BiTeBr JF - PHYSICAL REVIEW RESEARCH J2 - PRRESEARCH VL - 3 PY - 2021 IS - 3 PG - 11 SN - 2643-1564 DO - 10.1103/PhysRevResearch.3.033253 UR - https://m2.mtmt.hu/api/publication/32210273 ID - 32210273 LA - English DB - MTMT ER - TY - JOUR AU - Kun, Péter AU - Fülöp, Bálint AU - Dobrik, Gergely AU - Nemes Incze, Péter AU - Lukács, István Endre AU - Csonka, Szabolcs AU - Hwang, Chanyong AU - Tapasztó, Levente TI - Robust quantum point contact operation of narrow graphene constrictions patterned by AFM cleavage lithography JF - NPJ 2D MATERIALS AND APPLICATIONS J2 - NPJ 2D MATER APPL VL - 4 PY - 2020 IS - 1 PG - 6 SN - 2397-7132 DO - 10.1038/s41699-020-00177-x UR - https://m2.mtmt.hu/api/publication/31779701 ID - 31779701 LA - English DB - MTMT ER - TY - JOUR AU - Kun, Péter AU - Kukucska, Gergő AU - Dobrik, Gergely AU - Koltai, János AU - Kürti, Jenő AU - Biró, László Péter AU - Tapasztó, Levente AU - Nemes Incze, Péter TI - Large intravalley scattering due to pseudo-magnetic fields in crumpled graphene JF - NPJ 2D MATERIALS AND APPLICATIONS J2 - NPJ 2D MATER APPL VL - 3 PY - 2019 PG - 7 SN - 2397-7132 DO - 10.1038/s41699-019-0094-6 UR - https://m2.mtmt.hu/api/publication/30629282 ID - 30629282 AB - The pseudo-magnetic field generated by mechanical strain in graphene can have dramatic consequences on the behavior of electrons and holes. Here we show that pseudo-magnetic field fluctuations present in crumpled graphene can induce significant intravalley scattering of charge carriers. We detect this by measuring the confocal Raman spectra of crumpled areas, where we observe an increase of the D′/D peak intensity ratio by up to a factor of 300. We reproduce our observations by numerical calculation of the double resonant Raman spectra and interpret the results as experimental evidence of the phase shift suffered by Dirac charge carriers in the presence of a pseudo-magnetic field. This lifts the restriction on complete intravalley backscattering of Dirac fermions. LA - English DB - MTMT ER - TY - JOUR AU - Fülöp, Bálint AU - Tajkov, Zoltán AU - Pető, János AU - Kun, Péter AU - Koltai, János AU - Oroszlány, László AU - Tóvári, Endre AU - Murakawa, H AU - Tokura, Y AU - Bordács, Sándor AU - Tapasztó, Levente AU - Csonka, Szabolcs TI - Exfoliation of single layer BiTeI flakes JF - 2D MATERIALS J2 - 2D MATER VL - 5 ET - 0 PY - 2018 IS - 3 PG - 9 SN - 2053-1583 DO - 10.1088/2053-1583/aac652 UR - https://m2.mtmt.hu/api/publication/3390771 ID - 3390771 N1 - Department of Physics, Budapest University of Technology and Economics, Budafoki út 8, Budapest, 1111, Hungary MTA-BME Condensed Matter Research Group, Budafoki út 8, Budapest, 1111, Hungary Department of Biological Physics, Eötvös Loránd University, Budapest, Hungary Centre for Energy Research, Institute of Technical Physics and Materials Science, 2D Nanoelectronics Lendület Research Group, Budapest, Hungary Department of Physics of Complex Systems, Eötvös Loránd University, Budapest, Hungary MTA-BME Lendület Nanoelectronics Research Group, Budafoki út 8, Budapest, 1111, Hungary Department of Physics, Osaka University, Toyonaka, 560-0043, Japan Department of Applied Physics, University of Tokyo, Tokyo, 113-8656, Japan RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan AB - Spin orbit interaction is strongly enhanced in structures where a heavy element is embedded in an inversion asymmetric crystal field. A simple way for realizing such a setup is to take a single atomic layer of a heavy element and encapsulate it between two atomic layers of different elemental composition. BiTeI is a promising candidate for such a 2D crystal. In its bulk form BiTeI consists of loosely coupled three atom thick layers where a layer of high atomic number Bi are sandwiched between Te and I sheets. Despite considerable recent attention to bulk BiTeI due to its giant Rashba spin splitting, the isolation of a single layer remained elusive. In this work we report the first successful isolation and characterization of a single layer of BiTeI using a novel exfoliation technique on stripped gold. Our scanning probe studies and first principles calculations show that the fabricated 100 mu m sized BiTeI flakes are stable at ambient conditions. Giant Rashba splitting and spin-momentum locking of this new 2D crystal opens the way towards novel spintronic applications and synthetic topological heterostructures. LA - English DB - MTMT ER - TY - JOUR AU - Pálinkás, András AU - Kun, Péter AU - Koós, Antal Adolf AU - Osváth, Zoltán TI - Dynamic strain in gold nanoparticle supported graphene induced by focused laser irradiation JF - NANOSCALE J2 - NANOSCALE VL - 10 PY - 2018 IS - 28 SP - 13417 EP - 13425 PG - 19 SN - 2040-3364 DO - 10.1039/C8NR02848F UR - https://m2.mtmt.hu/api/publication/3384999 ID - 3384999 AB - Graphene on noble-metal nanostructures constitutes an attractive nanocomposite with possible applications in sensors or energy conversion. In this work we study the properties of hybrid graphene/gold nanoparticle structures by Raman spectroscopy and Scanning Probe Methods. The nanoparticles (NPs) were prepared by local annealing of gold thin films using focused laser beam. The method resulted in a patterned surface, with NPs formed at arbitrarily chosen microscale areas. Graphene grown by chemical vapour deposition was transferred onto the prepared, closely spaced gold NPs. While we found that successive higher intensity (6 mW) laser irradiation increased gradually the doping and the defect concentration in SiO2 supported graphene, the same irradiation procedure did not induce such irreversible effects in the graphene supported by gold NPs. Moreover, the laser irradiation induced dynamic hydrostatic strain in the graphene on Au NPs, which turned out to be completely reversible. These results can have implications in the development of graphene/plasmonic nanoparticle based high temperature sensors operating in dynamic regimes. LA - English DB - MTMT ER - TY - JOUR AU - Tapasztó, Orsolya AU - Balko, J AU - Puchy, V AU - Kun, Péter AU - Dobrik, Gergely AU - Fogarassy, Zsolt AU - Horváth, Zsolt Endre AU - Dusza, János AU - Balázsi, Katalin AU - Balázsi, Csaba AU - Tapasztó, Levente TI - Highly wear-resistant and low-friction Si3N4 composites by addition of graphene nanoplatelets approaching the 2D limit JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 7 PY - 2017 IS - 1 PG - 8 SN - 2045-2322 DO - 10.1038/s41598-017-10290-5 UR - https://m2.mtmt.hu/api/publication/3264622 ID - 3264622 LA - English DB - MTMT ER - TY - JOUR AU - Kun, Péter AU - Tapasztó, Orsolya AU - Czigány, Zsolt AU - Balázsi, Csaba TI - Preparation and characterization of multilayer graphene by mechanical milling and related applications for ceramic composites JF - MATERIALS SCIENCE FORUM J2 - MATER SCI FORUM VL - 729 PY - 2013 SP - 252 EP - 259 PG - 8 SN - 0255-5476 DO - 10.4028/www.scientific.net/MSF.729.252 UR - https://m2.mtmt.hu/api/publication/2047559 ID - 2047559 LA - English DB - MTMT ER - TY - JOUR AU - Balázsi, Csaba AU - Tapasztó, Orsolya AU - Károly, Zoltán AU - Kun, Péter AU - Balázsi, Katalin AU - Szépvölgyi, János TI - Structural and mechanical properties of milled Si3N4/cnts composites by spark plasma sintering method JF - MATERIALS SCIENCE FORUM J2 - MATER SCI FORUM VL - 729 PY - 2013 SP - 31 EP - 36 PG - 6 SN - 0255-5476 DO - 10.4028/www.scientific.net/MSF.729.31 UR - https://m2.mtmt.hu/api/publication/2047546 ID - 2047546 LA - English DB - MTMT ER -