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Accueil du site > Séminaires > LKB > Experimental observation of resonating valence bond states with ultracold bosonic atoms

Experimental observation of resonating valence bond states with ultracold bosonic atoms

Séminaire de Sylvain Nascimbene

Vendredi 21 octobre 2011, 9h15, salle de réunion du siège de l’IFRAF, au 4e étage du bâtiment Rataud à l’ENS au 45 rue d’Ulm.

Abstract :

The concept of valence bond resonance lies at the heart of fundamental many-body quantum physical phenomena. The so-called resonating valence bond (RVB) states of electrons in solid state materials have been hotly debated since Anderson proposed that they might underlie the physics of high temperature superconductors. Recently, the topological nature of RVB states and their promising potential for topological quantum computation has further increased the interest in their realization. However, a clear identification of these states in solid state materials remains elusive.

In this talk I will describe a recent experiment performed in the group of I. Bloch in Munich, which consists in a direct experimental evidence of a valence bond quantum resonance with ultracold bosonic atoms in an optical lattice. By means of a superlattice structure we create a two-dimensional array of independent 4-site plaquettes, which we can fully control and manipulate in parallel. A quantum resonance between vertical and horizontal valence bonds states of the plaquette is time resolved. Furthermore, we show how RVB states with s- and d-wave symmetry can be created, which constitute minimum basis states of a topologically protected quit.

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