Budapest University of Technology and Economics
Condensed matter research group, Hungarian Academy of Sciences
Biography
Research interest: Spintronics in nanostructural materials
Most important experience abroad:
2009-2010. Visiting scientist, Universität Wien, Austria
2003-2005. Individual Marie Curie fellowship, Universität Wien, Austria
1995-1996 TEMPUS scholarship, The University of Manchester, UK
Grants and Awards:
2010. European Research Council (ERC) Starting Independent Researcher Grant
2006. Talentum prize of the Hungarian Academy of Sciences
2005. Marie-Curie reintegration grant (ERG)
2003. Individual Marie-Curie postdoctoral fellowship (EIF)
Abstract
Magnetic Resonance in Novel Carbon Nanostructures
Carbon nanotubes (CNTs) represent the fourth phase of carbon after diamond, graphite and fullerenes. In particular, CNTs with a single shell, single-wall carbon nanotubes (SWCNTs) have a one-dimensional structure which is accompanied with a strong one-dimensional character, which results in a range of phenomena such as quantum transport behavior, superconductivity, the Peierls transition, and the Tomonaga-Luttinger liquid behavior. In addition to the fundamentally interesting properties, these materials are promising for applications with relevance for the Grand Challanges such as in the development of informatics, energetics, and medical sciences. Exploiting this enormous application potential calls for thorough studies with various spectroscopic methods. Much as magnetic resonance (MR) studies of SWCNTs are desired, they are hampered by the absence of well defined and understood ESR active electron spins on them and the uniform distribution of the NMR active 13C nuclei in all species of carbons present in samples. Our solution to these problems was to encapsulate magnetic fullerenes (N@C60 and C59N) inside single-wall CNTs to enable ESR [1] and to grow 13C enriched inner tubes from 13C enriched encapsulated fullerenes to enable NMR [2]. The earlier material contains CNTs filled with linear spin chains which has attracted interest as a potential element for quantum information processing. Temperature and field dependent 13C NMR T1 studies on the 13C enriched inner tubes detects a novel low energy gap [3] that is assigned to exotic Luther-Emery phase in the small diameter SWCNTs [4]. The implications of the correlated state was also studied for spintronics applications [5,6,7].
Carbon nanotubes (CNTs) represent the fourth phase of carbon after diamond, graphite and fullerenes. In particular, CNTs with a single shell, single-wall carbon nanotubes (SWCNTs) have a one-dimensional structure which is accompanied with a strong one-dimensional character, which results in a range of phenomena such as quantum transport behavior, superconductivity, the Peierls transition, and the Tomonaga-Luttinger liquid behavior. In addition to the fundamentally interesting properties, these materials are promising for applications with relevance for the Grand Challanges such as in the development of informatics, energetics, and medical sciences. Exploiting this enormous application potential calls for thorough studies with various spectroscopic methods. Much as magnetic resonance (MR) studies of SWCNTs are desired, they are hampered by the absence of well defined and understood ESR active electron spins on them and the uniform distribution of the NMR active 13C nuclei in all species of carbons present in samples. Our solution to these problems was to encapsulate magnetic fullerenes (N@C60 and C59N) inside single-wall CNTs to enable ESR [1] and to grow 13C enriched inner tubes from 13C enriched encapsulated fullerenes to enable NMR [2]. The earlier material contains CNTs filled with linear spin chains which has attracted interest as a potential element for quantum information processing. Temperature and field dependent 13C NMR T1 studies on the 13C enriched inner tubes detects a novel low energy gap [3] that is assigned to exotic Luther-Emery phase in the small diameter SWCNTs [4]. The implications of the correlated state was also studied for spintronics applications [5,6,7].
[1] F. Simon et al., Phys. Rev. Lett. 97, 136801 (2006).[2] F. Simon et al., Phys. Rev. Lett 95, 017401 (2005).[3] P.M. Singer et al., Phys. Rev. Lett. 95, 236403 (2005).[4] B. Dóra et al., Phys. Rev. Lett. 99, 166402 (2007). [5] B. Dóra et al., Phys. Rev. Lett. 101, 106408 (2008).[6] F. Simon et al., Phys. Rev. Lett. 101, 177003 (2008).[7] B. Dora and F. Simon, Phys. Rev. Lett. 102, 137001 (2009).
