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Observation and Spectroscopy of a Two-Electron Wigner Molecule in an Ultra-Clean Carbon Nanotube (Articolo in rivista)

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Observation and Spectroscopy of a Two-Electron Wigner Molecule in an Ultra-Clean Carbon Nanotube (Articolo in rivista) (literal)

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Alternative label

Pecker S. [ 1 ] ; Kuemmeth F. [ 2 ] ; Secchi A [ 3,4 ] ; Rontani M. [ 3 ] ; Ralph D. C. [ 5,6 ] ; McEuen, P. L. [ 5,6 ] ; Ilani S. [ 1 ] (2013)
Observation and Spectroscopy of a Two-Electron Wigner Molecule in an Ultra-Clean Carbon Nanotube
in Nature physics (Print); Nature Publishing Group, London (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Pecker S. [ 1 ] ; Kuemmeth F. [ 2 ] ; Secchi A [ 3,4 ] ; Rontani M. [ 3 ] ; Ralph D. C. [ 5,6 ] ; McEuen, P. L. [ 5,6 ] ; Ilani S. [ 1 ] (literal)

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[ 1 ] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel [ 2 ] Univ Copenhagen, Niels Bohr Inst, Ctr Quantum Devices, DK-2100 Copenhagen, Denmark [ 3 ] CNR NANO Res Ctr S3, I-41125 Modena, Italy [ 4 ] Univ Modena & Reggio Emilia, Dept Phys, I-41125 Modena, Italy [ 5 ] Cornell Univ, Dept Phys, Ithaca, NY 14853 USA [ 6 ] Cornell Univ, Kavli Inst Cornell, Ithaca, NY 14853 USA (literal)

Titolo

Observation and Spectroscopy of a Two-Electron Wigner Molecule in an Ultra-Clean Carbon Nanotube (literal)

Abstract

Two electrons on a string form a simple model system where Coulomb interactions are expected to play an interesting role. In the presence of strong interactions, these electrons are predicted to form a Wigner molecule, separating to the ends of the string. This spatial structure is believed to be clearly imprinted on the energy spectrum, yet so far a direct measurement of such a spectrum in a controllable one-dimensional setting is still missing. Here we use an ultraclean carbon nanotube to realize this system in a tunable potential. Using tunnelling spectroscopy we measure the addition spectra of two interacting carriers, electrons or holes, and identify seven low-energy states characterized by their exchange symmetries. The formation of a Wigner molecule is evident from a tenfold quenching of the fundamental excitation energy as compared with the non-interacting value. Our ability to tune the two-carrier state in space and to study it for both electrons and holes provides an unambiguous demonstration of this strongly interacting quantum ground state. (literal)

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