Zobrazeno 1 - 10
of 191
pro vyhledávání: '"Resta, Raffaele"'
Autor:
Resta, Raffaele
Publikováno v:
Phys. Rev. Lett. 133, 206903 (2024)
The electric field of light induces--in a non centrosymmetric insulator--a dc current, quadratic in the field magnitude, and called "shift current". When addressed from a many-electron viewpoint, the shift current has a simple explanation and a simpl
Externí odkaz:
http://arxiv.org/abs/2402.12489
Autor:
Resta, Raffaele
The nonlocal potential contributes an extra term to the velocity operator; I show here that such term affects the formal expression of the Drude weight in a nontrivial way. Notably, the present main result fixes a disturbing discrepancy in the Dreyer
Externí odkaz:
http://arxiv.org/abs/2312.14178
Autor:
Resta, Raffaele
A sharp definition of what "adiabatic" means is given; it is then shown that the time-dependent expectation value of a quantum-mechanical observable in the adiabatic limit can be expressed -- in many cases -- by means of the appropriate Berry curvatu
Externí odkaz:
http://arxiv.org/abs/2311.12729
Autor:
Resta, Raffaele
Adiabatic transport in a many-electron system is expressed in terms of the appropriate Berry curvature, owing to the Niu-Thouless theory [J. Phys A {\bf 17}, 2453 (1984)]; the main equation is very compact and very general. I address here three parad
Externí odkaz:
http://arxiv.org/abs/2211.13022
Autor:
Resta, Raffaele
Kohn's theory of Drude conductivity, established in a many-body framework, addresses even systems with disorder and correlation, besides the ordinary band metals (i.e. crystalline systems of independent electrons). Kohn's theory is here extended to n
Externí odkaz:
http://arxiv.org/abs/2111.12617
Autor:
Resta, Raffaele
Faraday's experiment measures -- within a modern view -- the charge adiabatically transported over a macroscopic distance by a given nuclear species in insulating liquids: the reason why it is integer is deeply rooted in topology. Whole numbers enter
Externí odkaz:
http://arxiv.org/abs/2104.06026
Autor:
Resta, Raffaele
The theory of the nonlinear Hall effect has been established by I. Sodemann and L. Fu [Phys. Rev. Lett. 115, 216806 (2015)] in a semiclassical framework: therein, the effect appears as a geometrical property of Bloch electrons, originating from their
Externí odkaz:
http://arxiv.org/abs/2101.10949
Autor:
Resta, Raffaele
Publikováno v:
J. Chem. Phys. 154, 050901 (2021), selected as Editor's Pick
The quantum-mechanical expression for the polarization of a crystalline solid does not bear any resemblance to the (trivial) expression for the dipole of a bounded crystallite; and in fact it has been proved via a conceptually different path. Here I
Externí odkaz:
http://arxiv.org/abs/2012.08425
Autor:
Bellomia, Gabriele, Resta, Raffaele
Publikováno v:
Phys. Rev. B 102, 205123 (2020)
A many-electron conducting system undergoes free acceleration in response to a macroscopic field. The Drude weight $D$---also called charge stiffness---measures the adiabatic (inverse) inertia of the electrons; the $D$ formal expression requires peri
Externí odkaz:
http://arxiv.org/abs/2007.04143
Autor:
Resta, Raffaele
Some intensive observables of the electronic ground state in condensed matter have a geometrical or even topological nature. In this Review I present the geometrical observables whose expression is known in a full many-body framework, beyond band-str
Externí odkaz:
http://arxiv.org/abs/2006.15567