3,857 research outputs found
Non-Local Order Parameters as a Probe for Phase Transitions in the Extended Fermi-Hubbard Model
The Extended Fermi-Hubbard model is a rather studied Hamiltonian due to both
its many applications and a rich phase diagram. Here we prove that all the
phase transitions encoded in its one dimensional version are detectable via
non-local operators related to charge and spin fluctuations. The main advantage
in using them is that, in contrast to usual local operators, their asymptotic
average value is finite only in the appropriate gapped phases. This makes them
powerful and accurate probes to detect quantum phase transitions. Our results
indeed confirm that they are able to properly capture both the nature and the
location of the transitions. Relevantly, this happens also for conducting
phases with a spin gap, thus providing an order parameter for the
identification of superconducting and paired superfluid phasesComment: 7 pages, 3 figures; Submitted to EPJ Special Topics, Quantum Gases
and Quantum Coherenc
Low energy quantum regimes of 1D dipolar Hubbard model with correlated hopping
We apply the bosonization technique to derive the phase diagram of a balanced
unit density two-component dipolar Fermi gas in a one dimensional lattice
geometry. The considered interaction processes are of the usual contact and
dipolar long-range density-density type together with peculiar correlated
hopping terms which can be generated dynamically. Rigorous bounds for the
transition lines are obtained in the weak coupling regime. In addition to the
standard bosonization description, we derive the low energy phase diagram
taking place when part of the interaction is embodied non-perturbatively in the
single component Hamiltonians. In this case the Luttinger liquid regime is
shown to become unstable with respect to the opening of further gapped phases,
among which insulating bond ordered wave and Haldane phases, the latter with
degenerate edge modes.Comment: 6 pages, 1 figur
Study of image characteristics on digital image correlation error assessment
In this paper, errors related to digital image correlation (DIC) technique applied to measurements of displacements are estimated. This work is based on the generation of synthetic images representative of real speckle patterns. With these images, various parameters are treated in order to determine their impact on the measurement error. These parameters are related to the type of deformation imposed on the speckle, the speckle itself (encoding of the image, image saturation) or the software (subset size)
The CLAIRE visual analytics system for analysing IR evaluation data
In this paper, we describe Combinatorial visuaL Analytics system for Information Retrieval Evaluation (CLAIRE), a Visual Analytics (VA) system for exploring and making sense of the performances of a large amount of Information Retrieval (IR) systems, in order to quickly and intuitively grasp which system configurations are preferred, what are the contributions of the different components and how these components interact together
Symposium Poster- Materiality as Method: Communicating Through Form in Artists' Books
This is a poster created for an undergraduate research symposium where I presented my ASRA2017 project at HAAARCH, an undergraduate symposium that takes place in the Frick Fine Arts building in which students present their independent research projects, senior theses, and internships as well as at the Celebration of Research (COR) hosted by the Office of Undergraduate Research
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