696 research outputs found
Dynamics of Quantum Noise in a Tunnel Junction under ac Excitation
We report the first measurement of the \emph{dynamical response} of shot
noise (measured at frequency ) of a tunnel junction to an ac excitation
at frequency . The experiment is performed in the quantum regime,
at very low temperature T=35mK and high
frequency GHz. We observe that the noise responds in phase
with the excitation, but not adiabatically. The results are in very good
agreement with a prediction based on a new current-current correlator.Comment: Theory removed. More experimental details. One extra figur
Locally principal ideals and finite character
It is well-known that if R is a domain with finite character, each locally
principal nonzero ideal of R is invertible. We address the problem of
understanding when the converse is true and survey some recent results
Stability and Clifford regularity with respect to star operations
In the last few years, the concepts of stability and Clifford regularity have
been fruitfully extended by using star operations. In this paper we deepen the
study of star stable and star regular domains and relate these two classes of
domains to each other.Comment: 22 pages; Comm. Alg., 201
Star Stable Domains
We introduce and study the notion of -stability with respect to a
semistar operation defined on a domain ; in particular we consider
the case where is the -operation. This notion allows us to
generalize and improve several properties of stable domains and totally
divisorial domains.Comment: 21 pages. J. Pure Appl. Algebra, to appea
Star Stability and Star Regularity for Mori Domains
In the last few years, the concepts of stability and Clifford regularity have
been fruitfully extended by using star operations. In this paper we study and
put in relation these properties for Noetherian and Mori domains, substantially
improving several results present in the literature.Comment: 14 pages; Rend. Semin. Mat. Univ. Padova, 201
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