66 research outputs found
Floquet Formalism of Quantum Pumps
We review Floquet formalism of quantum electron pumps. In the Floquet
formalism the quantum pump is regarded as a time dependent scattering system,
which allows us to go beyond the adiabatic limit. It can be shown that the
well-known adiabatic formula given by Brouwer can be derived from the adiabatic
limit of Floquet formalism. We compare various physical properties of the
quantum pump both in the adiabatic and in the non-adiabatic regime using the
Floquet theory.Comment: Latex2e 16 pages, 6 figures. A review paper to appear in Int. J. Mod.
Phys.
Magnetic monopoles, alive
We review recent developments in understanding the physics of the magnetic
monopoles in unbroken non-Abelian gauge theories. Since numerical data on the
monopoles are accumulated in lattice simulations, the continuum theory is
understood as the limiting case of the lattice formulation. In this review,
written for a memorial volume dedicated to the memory of Academician A.B.
Migdal, we emphasize physical effects related to the monopoles. In particular,
we discuss the monopole-antimonopole potential at short and larger distances as
well as a dual formulation of the gluodynamics, relevant to the physics of the
confinement.Comment: 24+1 pp., Latex2e, no figure
Surface operators and magnetic degrees of freedom in Yang-Mills theories
Magnetic degrees of freedom are manifested through violations of the Bianchi
identities and associated with singular fields. Moreover, these singularities
should not induce color non-conservation. We argue that the resolution of the
constraint is that the singular fields, or defects are Abelian in nature.
Recently proposed surface operators seem to represent a general solution to
this constraint and can serve as a prototype of magnetic degrees of freedom.
Some basic lattice observations, such as the Abelian dominance of the confining
fields, are explained then as consequences of the original non-Abelian
invariance.Comment: Improved version. In honor of L. Okun for his 80th birthday. To
appear in Yadernaya Fizik
Many body physics from a quantum information perspective
The quantum information approach to many body physics has been very
successful in giving new insight and novel numerical methods. In these lecture
notes we take a vertical view of the subject, starting from general concepts
and at each step delving into applications or consequences of a particular
topic. We first review some general quantum information concepts like
entanglement and entanglement measures, which leads us to entanglement area
laws. We then continue with one of the most famous examples of area-law abiding
states: matrix product states, and tensor product states in general. Of these,
we choose one example (classical superposition states) to introduce recent
developments on a novel quantum many body approach: quantum kinetic Ising
models. We conclude with a brief outlook of the field.Comment: Lectures from the Les Houches School on "Modern theories of
correlated electron systems". Improved version new references adde
Bogen and Woodward’s data-phenomena distinction, forms of theory-ladenness, and the reliability of data
The Technique of Binary Code Decompilation and Its Application in Information Security Sphere
The authors describes a new technique of binary code decompilation and its application possibility in information security such as software protection against reverse engineering and code obfuscation analyze in malware
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