1,788 research outputs found
Energy-dependent spatial texturing of the charge order in -CuTiSe
We report a detailed study of the microscopic effects of Cu intercalation on
the charge density wave (CDW) in 1\textit{T}-CuTiSe. Scanning tunneling
microscopy and spectroscopy (STM/STS) reveal a unique, Cu driven spatial
texturing of the charge ordered phase, with the appearance of energy dependent
CDW patches and sharp -phase shift domain walls (DWs). The energy and
doping dependencies of the patchwork are directly linked to the inhomogeneous
potential landscape due to the Cu intercalants. They imply a CDW gap with
unusual features, including a large amplitude, the opening below the Fermi
level and a shift to higher binding energy with electron doping. Unlike the
patchwork, the DWs occur independently of the intercalated Cu
distribution. They remain atomically sharp throughout the investigated phase
diagram and occur both in superconducting and non-superconducting specimen.
These results provide unique atomic-scale insight on the CDW ground state,
questioning the existence of incommensurate CDW domain walls and contributing
to understand its formation mechanism and interplay with superconductivity
Dimensional cross-over of the charge density wave order parameter in thin exfoliated 1T-VSe
The capability to isolate one to few unit-cell thin layers from the bulk
matrix of layered compounds opens fascinating prospects to engineer novel
electronic phases. However, a comprehensive study of the thickness dependence
and of potential extrinsic effects are paramount to harness the electronic
properties of such atomic foils. One striking example is the charge density
wave (CDW) transition temperature in layered dichalcogenides whose thickness
dependence remains unclear in the ultrathin limit. Here we present a detailed
study of the thickness and temperature dependences of the CDW in VSe by
scanning tunnelling microscopy (STM). We show that mapping the real-space CDW
periodicity over a broad thickness range unique to STM provides essential
insight. We introduce a robust derivation of the local order parameter and
transition temperature based on the real space charge modulation amplitude.
Both quantities exhibit a striking non-monotonic thickness dependence that we
explain in terms of a 3D to 2D dimensional crossover in the FS topology. This
finding highlights thickness as a true tuning parameter of the electronic
ground state and reconciles seemingly contradicting thickness dependencies
determined in independent transport studies
Progetto PCB di sistemi per energy harvesting da sorgenti a bassissime tensioni
Per realizzare sistemi completamente autonomi dal punto di vista energetico sono in fase di sviluppo applicazioni basate sul recupero dell'energia dall'ambiente circostante. Questa idea è alla base dell'energy harvesting, ovvero "energia recuperata". Lo scopo di questo elaborato è la realizzazione di tre prototipi di schede PCB che implementino differenti circuiti per applicazioni di energy harvesting da sorgenti con tensioni dell'ordine della decina di mV, con l'obiettivo di avviare un sistema da uno stato di completa scarica
Common Musculoskeletal Disorders in the Elderly: The Star Triad
Musculoskeletal disorders are debilitating conditions that significantly impair the state of health, especially in elderly subjects. A pathological triad of inter-related disorders that are highly prevalent in the elderly consists of the following main “components”: sarcopenia, tendinopathies, and arthritis. The aim of this review is to critically appraise the literature relative to the different disorders of this triad, in order to highlight the pathophysiological common denominator and propose strategies for personalized clinical management of patients presenting with this combination of musculoskeletal disorders. Their pathophysiological common denominator is represented by progressive loss of (focal or generalized) neuromuscular performance with a risk of adverse outcomes such as pain, mobility disorders, increased risk of falls and fractures, and impaired ability or disability to perform activities of daily living. The precise management of these disorders requires not only the use of available tools and recently proposed operational definitions, but also the development of new tools and approaches for prediction, diagnosis, monitoring, and prognosis of the three disorders and their combination
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