Author: "Fallani, L." / Topic: atoms - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "Fallani, L." Topic atoms

Author: Guarrera, V., Fallani, L., Lye, J. E., Fort, C., and Inguscio, M.
Subjects: *BOSONS, *PARTICLES (Nuclear physics), *BOSE-Einstein condensation, *ATOMS, *COLD gases, *SOLID state physics
Abstract: In recent years ultracold atoms in optical lattices have been extensively employed as quantum simulators to study the physics of conventional solid state systems. Due to the possibility of introducing controlled disorder, it appears now a straightforward progression to use ultracold atoms in optical potentials to also study the physics of complex systems. We experimentally study a system of bosonic 87Rb atoms in a 3D optical lattice, where disorder is introduced on the length scale of the lattice sites by using an auxiliary optical lattice with a non-commensurate wavelength. Increasing the amount of disorder, we observe the transition from a Mott Insulator state to a novel gapless insulating phase induced by the cooperation of interactions and disorder, which could be identified with a Bose Glass phase. We discuss the experimental results as well as possible additional techniques for a better diagnostic of the system and future implementations of the two-color lattices in the study of different disorder-induced phenomena. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
Published: 2006
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Author: Guarrera, V., Fallani, L., Lye, J. E., Fort, C., and Inguscio, M.
Subjects: *LATTICE theory, *WAVELENGTHS, *SPECTRUM analysis, *ATOMS, *OPTICAL resonance, *QUANTUM optics
Abstract: We report an analysis of the inhomogeneous broadening of the excitation spectrum of a three-dimensional (3D) Mott insulator (MI) due to the presence of weak disorder. We present a theoretical model predicting the modification in the spectrum and compare the results to the experimental data obtained for a system of ultracold 87Rb atoms in a 3D optical lattice, where quasi-disorder is added by means of an auxiliary 1D optical lattice with non-commensurate wavelength. The model shows good agreement with the measured points, confirming a significant broadening of the MI spectrum resonances even for a very small height of the disordering potential. [ABSTRACT FROM AUTHOR]
Published: 2007
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Author: Mancini, M., Pagano, G., Cappellini, G., Livi, L., Rider, M., Catani, J., Sias, C., Zoller, P., Inguscio, M., Dalmonte, M., and Fallani, L.
Subjects: *FERMIONS, *CHIRALITY of nuclear particles, *QUANTUM Hall effect, *ATOMS, *CYCLOTRONS, *CHIRALITY, *CHARTS, diagrams, etc.
Abstract: Chiral edge states are a hallmark of quantum Hall physics. In electronic systems, they appear as a macroscopic consequence of the cyclotron orbits induced by a magnetic field, which are naturally truncated at the physical boundary of the sample. Here we report on the experimental realization of chiral edge states in a ribbon geometry with an ultracold gas of neutral fermions subjected to an artificial gauge field. By imaging individual sites along a synthetic dimension, encoded in the nuclear spin of the atoms, we detect the existence of the edge states and observe the edge-cyclotron orbits induced during quench dynamics. The realization of fermionic chiral edge states opens the door for edge state interferometry and the study of non-Abelian anyons in atomic systems. [ABSTRACT FROM AUTHOR]
Published: 2015
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Author: Rosi, S., Bernard, A., Fabbri, N., Fallani, L., Fort, C., Inguscio, M., Calarco, T., and Montangero, S.
Subjects: *ATOMS, *QUANTUM theory, *SUPERFLUIDITY, *OPTICAL lattices, *QUANTUM phase transitions, *OPTIMAL control theory, *PHYSICS experiments
Abstract: We present experimental evidence of the successful closed-loop optimization of the dynamics of cold atoms in an optical lattice. We optimize the loading of an ultracold atomic gas minimizing the excitations in an array of one-dimensional (ID) tubes (3D-ID crossover) and we perform an optimal crossing of the quantum phase-transition from a superfluid to a Mott insulator in a 3D lattice. In both cases we enhance the experiment performances with respect to those obtained via adiabatic dynamics, effectively speeding up the process by more than a factor three while improving the quality of the desired transformation. [ABSTRACT FROM AUTHOR]
Published: 2013
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