TY - JOUR AU - Alassaf, A. AU - Koltai, János AU - Oroszlány, László TI - Surface magnon spectra of nodal loop semimetals JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 109 PY - 2024 IS - 3 PG - 11 SN - 2469-9950 DO - 10.1103/PhysRevB.109.035161 UR - https://m2.mtmt.hu/api/publication/34715042 ID - 34715042 LA - English DB - MTMT ER - TY - GEN AU - Kovács-Krausz, Zoltán AU - Nagy, Dániel AU - Márffy, Albin Máté AU - Karpiak, Bogdan AU - Tajkov, Zoltán AU - Oroszlány, László AU - Koltai, János AU - Nemes Incze, Péter AU - Dash, Saroj P AU - Makk, Péter AU - Csonka, Szabolcs AU - Tóvári, Endre TI - Signature of pressure-induced topological phase transition in ZrTe5 PY - 2023 UR - https://m2.mtmt.hu/api/publication/34719870 ID - 34719870 AB - The layered van der Waals material ZrTe5 is known as a candidate topological insulator (TI), however its topological phase and the relation with other properties such as an apparent Dirac semimetallic state is still a subject of debate. We employ a semiclassical multicarrier transport (MCT) model to analyze the magnetotransport of ZrTe5 nanodevices at hydrostatic pressures up to 2 GPa. The temperature dependence of the MCT results between 10 and 300 K is assessed in the context of thermal activation, and we obtain the positions of conduction and valence band edges in the vicinity of the chemical potential. We find evidence of the closing and subsequent re-opening of the band gap with increasing pressure, which is consistent with a phase transition from weak to strong TI. This matches expectations from ab initio band structure calculations, as well as previous observations that CVT-grown ZrTe5 is in a weak TI phase in ambient conditions. LA - English DB - MTMT ER - TY - JOUR AU - Martínez-Carracedo, G. AU - Oroszlány, László AU - García-Fuente, A. AU - Nyári, Bendegúz Tamás AU - Udvardi, László AU - Szunyogh, László AU - Ferrer, J. TI - Relativistic magnetic interactions from nonorthogonal basis sets JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 21 PG - 18 SN - 2469-9950 DO - 10.1103/PhysRevB.108.214418 UR - https://m2.mtmt.hu/api/publication/34470105 ID - 34470105 LA - English DB - MTMT ER - TY - JOUR AU - Kovács-Krausz, Zoltán AU - Tóvári, Endre AU - Nagy, Dániel AU - Márffy, Albin Máté AU - Karpiak, Bogdan AU - Tajkov, Zoltán AU - Oroszlány, László AU - Koltai, János AU - Nemes Incze, Péter AU - Dash, Saroj P. AU - Makk, Péter AU - Csonka, Szabolcs TI - Revealing the band structure of ZrTe5 using multicarrier transport JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 107 PY - 2023 IS - 7 PG - 10 SN - 2469-9950 DO - 10.1103/PhysRevB.107.075152 UR - https://m2.mtmt.hu/api/publication/33673970 ID - 33673970 LA - English DB - MTMT ER - TY - JOUR AU - Martínez-Carracedo, Gabriel AU - Oroszlány, László AU - García-Fuente, Amador AU - Szunyogh, László AU - Ferrer, Jaime TI - Electrically driven singlet-triplet transition in triangulene spin-1 chains JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 107 PY - 2023 IS - 3 PG - 5 SN - 2469-9950 DO - 10.1103/PhysRevB.107.035432 UR - https://m2.mtmt.hu/api/publication/33644685 ID - 33644685 LA - English DB - MTMT ER - TY - CONF AU - Oroszlány, László TI - Kvantum információ tárolására alkalmas topologikus szupravezető állapotok vizsgálata T2 - Intézményi ÚNKP Konferencia 2022 PB - Eötvös Loránd Tudományegyetem (ELTE) PY - 2022 SP - 321 UR - https://m2.mtmt.hu/api/publication/33126569 ID - 33126569 LA - Hungarian 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 - Tajkov, Zoltán AU - Nagy, Dániel AU - Kandrai, Konrád AU - Koltai, János AU - Oroszlány, László AU - Süle, Péter AU - Horváth, Zsolt Endre AU - Vancsó, Péter AU - Tapasztó, Levente AU - Nemes Incze, Péter TI - Revealing the topological phase diagram of ZrTe5 using the complex strain fields of microbubbles JF - NPJ COMPUTATIONAL MATERIALS J2 - NPJ COMPUT MATER VL - 8 PY - 2022 IS - 1 PG - 7 SN - 2057-3960 DO - 10.1038/s41524-022-00854-z UR - https://m2.mtmt.hu/api/publication/33068873 ID - 33068873 AB - Topological materials host robust properties, unaffected by microscopic perturbations, owing to the global topological properties of the bulk electron system. Materials in which the topological invariant can be changed by easily tuning external parameters are especially sought after. Zirconium pentatelluride (ZrTe5) is one of a few experimentally available materials that reside close to the boundary of a topological phase transition, allowing the switching of its invariant by mechanical strain. Here, we unambiguously identify a topological insulator-metal transition as a function of strain, by a combination of ab initio calculations and direct measurements of the local charge density. Our model quantitatively describes the response to complex strain patterns found in bubbles of few layer ZrTe5 without fitting parameters, reproducing the mechanical deformation-dependent closing of the band gap observed using scanning tunneling microscopy. We calculate the topological phase diagram of ZrTe5 and identify the phase at equilibrium, enabling the design of device architectures, which exploit the topological switching characteristics of the system. LA - English DB - MTMT ER - TY - GEN AU - Koltai, János AU - B., Fecske AU - E., Kósa AU - Oroszlány, László AU - Tajkov, Zoltán TI - A Bell–CHSH-egyenlőtlenségek tesztelése PY - 2021 PG - 8 UR - https://m2.mtmt.hu/api/publication/32522179 ID - 32522179 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Okvátovity, Zoltán AU - Oroszlány, László AU - Dóra, Balázs TI - Time-dependent electric transport in nodal loop semimetals JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 104 PY - 2021 IS - 3 SN - 2469-9950 DO - 10.1103/PhysRevB.104.035130 UR - https://m2.mtmt.hu/api/publication/32105841 ID - 32105841 N1 - Funding Agency and Grant Number: National Research, Development and Innovation Office -NKFIH within the Quantum Information National Laboratory of Hungary; National Research, Development and Innovation Office -NKFIH within the Quantum Technology National Excellence ProgramNational Research, Development & Innovation Office (NRDIO) - Hungary [2017-1.2.1-NKP-2017-00001, K119442, K134437, K131938, FK124723]; Romanian National Authority for Scientific Research and Innovation, UEFISCDIConsiliul National al Cercetarii Stiintifice (CNCS)Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii (UEFISCDI) [PN-III-P4-ID-PCE-2020-0277]; NRDI Office of HungaryNational Research, Development & Innovation Office (NRDIO) - Hungary; Hungarian Academy of Sciences through the Bolyai scholarship; Hungarian Academy of Sciences through the Bolyai+ scholarship Funding text: This research is supported by the National Research, Development and Innovation Office -NKFIH within the Quantum Information National Laboratory of Hungary and Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), K119442, K134437, K131938, FK124723, and by the Romanian National Authority for Scientific Research and Innovation, UEFISCDI, under Project No. PN-III-P4-ID-PCE-2020-0277. L.O. also acknowledges support from of the NRDI Office of Hungary and the Hungarian Academy of Sciences through the Bolyai and Bolyai+ scholarships. LA - English DB - MTMT ER -