Polarization, magnetization, and other geometrical properties of the electronic ground state
Abstract
Polarization, magnetization, and other geometrical properties of the electronic ground stateAbstract:This proposal concerns physic"al observables of materials (crystalline and noncrystalline) whose theoretical root is in geometrical properties of the electronic ground state; the proposal also concerns the implementation of algorithms to compute such properties. The archetype in this class of" observables is the macroscopic electric polarization of solids, for which first-principle understanding dates since 1992 onwards;"" other observables followed over the years. Such observables have very different experimental meanings, yet they show a common forma""l structure from a theoretical viewpoint The observables addressed under this proposal are in number of six, and~for reasons which w"ill be outlined in the proposal~can be regrouped in two plus four. Within each of the two classes the observables enjoy pretty similar formal features among themselves. The first class concerns insulators only: it includes electric polarization and an isotropic co"ntribution to the linear magnetoelectric effect in crystalline insulators, sometimes dubbed ~axion~ term.The second class includes"" orbital magnetization (in insulators an metals), Drude weight (nontrivial in metals only), anomalous Hall conductivity (in insulato""rs and metals), and the gauge-invariant quadratic spread of the electron distribution (in insulators only). The last entry in the a"bove list deserves a comment: despite it appeared in the literature as an auxiliary formal quantity it corresponds nonetheless to an" experimentally measurable property. Because of their mutual relationships, the four observables can be displayed in tabular form a"s follows:Quadratic spread Anomalous(insulators only) Hall conductivity Drude weight Orbital(metals only) magnetization The res"earch is to be be conducted at the IOM (Istituto Officina dei Material), belonging to CNR (National Research Council), under the dir"ection of Dr. Raffaele Resta. The PI will also hold a part-time appointment at the University of Trieste. Most of the Grant will sup"port ongoing collaborations with some US research groups, including the cost of international travel (to the US) and extended stays"" of the PI, and possibly some coworkers, at selected US institutions.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 29, 2017
- Source ID
- N000141712803
Entities
People
- Raffaele Resta
Organizations
- Consiglio Nazionale delle Ricerche
- Office of Naval Research
- United States Navy