@misc{MTMT:34719870,
	title = {Signature of pressure-induced topological phase transition in ZrTe5},
	url = {https://m2.mtmt.hu/api/publication/34719870},
	author = {Kovács-Krausz, Zoltán and Nagy, Dániel and Márffy, Albin Máté and Karpiak, Bogdan and Tajkov, Zoltán and Oroszlány, László and Koltai, János and Nemes Incze, Péter and Dash, Saroj P and Makk, Péter and Csonka, Szabolcs and Tóvári, Endre},
	unique-id = {34719870},
	abstract = {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.},
	year = {2023},
	orcid-numbers = {Kovács-Krausz, Zoltán/0000-0001-5821-6195; Oroszlány, László/0000-0001-5682-6424; Koltai, János/0000-0003-2576-9740; Nemes Incze, Péter/0000-0002-1222-3020; Tóvári, Endre/0000-0002-0000-3805}
}

@article{MTMT:33673970,
	title = {Revealing the band structure of ZrTe5 using multicarrier transport},
	url = {https://m2.mtmt.hu/api/publication/33673970},
	author = {Kovács-Krausz, Zoltán and Tóvári, Endre and Nagy, Dániel and Márffy, Albin Máté and Karpiak, Bogdan and Tajkov, Zoltán and Oroszlány, László and Koltai, János and Nemes Incze, Péter and Dash, Saroj P. and Makk, Péter and Csonka, Szabolcs},
	doi = {10.1103/PhysRevB.107.075152},
	journal-iso = {PHYS REV B},
	journal = {PHYSICAL REVIEW B},
	volume = {107},
	unique-id = {33673970},
	issn = {2469-9950},
	year = {2023},
	eissn = {2469-9969},
	orcid-numbers = {Kovács-Krausz, Zoltán/0000-0001-5821-6195; Tóvári, Endre/0000-0002-0000-3805; Karpiak, Bogdan/0000-0001-7462-8405; Oroszlány, László/0000-0001-5682-6424; Koltai, János/0000-0003-2576-9740; Nemes Incze, Péter/0000-0002-1222-3020; Dash, Saroj P./0000-0001-7931-4843}
}

@article{MTMT:33090541,
	title = {Observation of competing, correlated ground states in the flat band of rhombohedral graphite},
	url = {https://m2.mtmt.hu/api/publication/33090541},
	author = {Hagymási, Imre and Mohd, Isa M.S. and Tajkov, Zoltán and Márity, K. and Oroszlány, László and Koltai, János and Al-Assaf, Assem Mustafa Abd-Alrhman and Kun, Péter and Kandrai, Konrád and Pálinkás, András and Vancsó, Péter and Tapasztó, Levente and Nemes Incze, Péter},
	doi = {10.1126/sciadv.abo6879},
	journal-iso = {SCI ADV},
	journal = {SCIENCE ADVANCES},
	volume = {8},
	unique-id = {33090541},
	issn = {2375-2548},
	year = {2022},
	eissn = {2375-2548},
	orcid-numbers = {Oroszlány, László/0000-0001-5682-6424; Koltai, János/0000-0003-2576-9740; Vancsó, Péter/0000-0003-4333-9787; Tapasztó, Levente/0000-0002-9377-8465; Nemes Incze, Péter/0000-0002-1222-3020}
}

@article{MTMT:33068873,
	title = {Revealing the topological phase diagram of ZrTe5 using the complex strain fields of microbubbles},
	url = {https://m2.mtmt.hu/api/publication/33068873},
	author = {Tajkov, Zoltán and Nagy, Dániel and Kandrai, Konrád and Koltai, János and Oroszlány, László and Süle, Péter and Horváth, Zsolt Endre and Vancsó, Péter and Tapasztó, Levente and Nemes Incze, Péter},
	doi = {10.1038/s41524-022-00854-z},
	journal-iso = {NPJ COMPUT MATER},
	journal = {NPJ COMPUTATIONAL MATERIALS},
	volume = {8},
	unique-id = {33068873},
	issn = {2057-3960},
	abstract = {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.},
	year = {2022},
	eissn = {2057-3960},
	orcid-numbers = {Koltai, János/0000-0003-2576-9740; Oroszlány, László/0000-0001-5682-6424; Horváth, Zsolt Endre/0000-0002-4632-0136; Vancsó, Péter/0000-0003-4333-9787; Tapasztó, Levente/0000-0002-9377-8465; Nemes Incze, Péter/0000-0002-1222-3020}
}

@misc{MTMT:32522179,
	title = {A Bell–CHSH-egyenlőtlenségek tesztelése},
	url = {https://m2.mtmt.hu/api/publication/32522179},
	author = {Koltai, János and B., Fecske and E., Kósa and Oroszlány, László and Tajkov, Zoltán},
	unique-id = {32522179},
	year = {2021},
	orcid-numbers = {Koltai, János/0000-0003-2576-9740; Oroszlány, László/0000-0001-5682-6424}
}

@article{MTMT:31374892,
	title = {Competition of topological and topologically trivial phases in patterned graphene based heterostructures},
	url = {https://m2.mtmt.hu/api/publication/31374892},
	author = {Tajkov, Zoltán and Koltai, János and Cserti, József and Oroszlány, László},
	doi = {10.1103/PhysRevB.101.235146},
	journal-iso = {PHYS REV B},
	journal = {PHYSICAL REVIEW B},
	volume = {101},
	unique-id = {31374892},
	issn = {2469-9950},
	year = {2020},
	eissn = {2469-9969},
	orcid-numbers = {Tajkov, Zoltán/0000-0001-9733-0361; Koltai, János/0000-0003-2576-9740; Cserti, József/0000-0002-2137-535X; Oroszlány, László/0000-0001-5682-6424}
}

@article{MTMT:30887683,
	title = {Topological Phase Diagram of BiTeX–Graphene Hybrid Structures},
	url = {https://m2.mtmt.hu/api/publication/30887683},
	author = {Tajkov, Zoltán and Visontai, David and Oroszlány, László and Koltai, János},
	doi = {10.3390/app9204330},
	journal-iso = {APPL SCI-BASEL},
	journal = {APPLIED SCIENCES-BASEL},
	volume = {9},
	unique-id = {30887683},
	year = {2019},
	eissn = {2076-3417},
	orcid-numbers = {Visontai, David/0000-0002-0029-709X; Oroszlány, László/0000-0001-5682-6424; Koltai, János/0000-0003-2576-9740}
}

@article{MTMT:30636508,
	title = {Uniaxial Strain Induced Topological Phase Transition in Bismuth-Tellurohalide-Graphene Heterostructures},
	url = {https://m2.mtmt.hu/api/publication/30636508},
	author = {Tajkov, Zoltán and Visontai, David and Oroszlány, László and Koltai, János},
	doi = {10.1039/c9nr04519h},
	journal-iso = {NANOSCALE},
	journal = {NANOSCALE},
	volume = {11},
	unique-id = {30636508},
	issn = {2040-3364},
	year = {2019},
	eissn = {2040-3372},
	pages = {12704-12711},
	orcid-numbers = {Visontai, David/0000-0002-0029-709X; Oroszlány, László/0000-0001-5682-6424; Koltai, János/0000-0003-2576-9740}
}

@article{MTMT:30602960,
	title = {Magic Number Theory of Superconducting Proximity Effects and Wigner Delay Times in Graphene-Like Molecules},
	url = {https://m2.mtmt.hu/api/publication/30602960},
	author = {Rakyta, Péter and Alanazy, A. and Kormányos, Andor and Tajkov, Zoltán and Kukucska, Gergő and Koltai, János and Sangtarash, S. and Sadeghi, H. and Cserti, József and Lambert, C. J.},
	doi = {10.1021/acs.jpcc.8b11161},
	journal-iso = {J PHYS CHEM C},
	journal = {JOURNAL OF PHYSICAL CHEMISTRY C},
	volume = {123},
	unique-id = {30602960},
	issn = {1932-7447},
	abstract = {When a single molecule is connected to external electrodes by linker groups, the connectivity of the linkers to the molecular core can be controlled to atomic precision by appropriate chemical synthesis. Recently, the connectivity dependence of the electrical conductance and Seebeck coefficient of single molecules has been investigated both theoretically and experimentally. Here we study the connectivity dependence of the Wigner delay time of single-molecule junctions and the connectivity dependence of superconducting proximity effects, which occur when the external electrodes are replaced by superconductors. Although absolute values of transport properties depend on complex and often uncontrolled details of the coupling between the molecule and electrodes, we demonstrate that ratios of transport properties can be predicted using tables of 'magic numbers,' which capture the connectivity dependence of superconducting proximity effects and Wigner delay times within molecules. These numbers are calculated easily, without the need for large-scale computations. For normal-molecule-superconducting junctions, we find that the electrical conductance is proportional to the fourth power of their magic numbers, whereas for superconducting-molecule-superconducting junctions, the critical current is proportional to the square of their magic numbers. For more conventional normal-molecule-normal junctions, we demonstrate that delay time ratios can be obtained from products of magic number tables.},
	year = {2019},
	eissn = {1932-7455},
	pages = {6812-6822},
	orcid-numbers = {Rakyta, Péter/0000-0002-3506-558X; Kormányos, Andor/0000-0002-6837-6966; Kukucska, Gergő/0000-0002-8715-8075; Koltai, János/0000-0003-2576-9740; Cserti, József/0000-0002-2137-535X}
}

@article{MTMT:3390771,
	title = {Exfoliation of single layer BiTeI flakes},
	url = {https://m2.mtmt.hu/api/publication/3390771},
	author = {Fülöp, Bálint and Tajkov, Zoltán and Pető, János and Kun, Péter and Koltai, János and Oroszlány, László and Tóvári, Endre and Murakawa, H and Tokura, Y and Bordács, Sándor and Tapasztó, Levente and Csonka, Szabolcs},
	doi = {10.1088/2053-1583/aac652},
	journal-iso = {2D MATER},
	journal = {2D MATERIALS},
	volume = {5},
	unique-id = {3390771},
	issn = {2053-1583},
	abstract = {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.},
	keywords = {AU; ENERGY; CRYSTALS; Graphene; Graphite; Rashba spin splitting; topological insulator; BiTeI; RASHBA; AU(111) SURFACE; DER-WAALS HETEROSTRUCTURES; SCANNING-TUNNELING-MICROSCOPE; stripped gold exfoliation; van der Waals heterostructures},
	year = {2018},
	eissn = {2053-1583},
	orcid-numbers = {Fülöp, Bálint/0000-0001-6853-2642; Koltai, János/0000-0003-2576-9740; Oroszlány, László/0000-0001-5682-6424; Tóvári, Endre/0000-0002-0000-3805; Bordács, Sándor/0000-0003-0420-5997; Tapasztó, Levente/0000-0002-9377-8465}
}