Aviso: para depositar documentos, por favor, inicia sesión e identifícate con tu cuenta de correo institucional de la UCM con el botón MI CUENTA UCM. No emplees la opción AUTENTICACIÓN CON CONTRASEÑA
 

Phase dependence of localization in the driven two-level model

Loading...
Thumbnail Image

Full text at PDC

Publication date

2004

Advisors (or tutors)

Editors

Journal Title

Journal ISSN

Volume Title

Publisher

European Physical Society
Citations
Google Scholar

Citation

Abstract

A two-level system subjected to a high-frequency driving field can exhibit an effect termed "coherent destruction of tunneling", in which the tunneling of the system is suppressed at certain values of the frequency and strength of the field. This suppression becomes less effective as the frequency of the driving field is reduced, and we show here how the detailed form of its fall-off depends on the phase of the driving, which for certain values can produce small local maxima (or revivals) in the overall decay. By considering a square-wave driving field, which has the advantage of being analytically tractable, we show how this surprising behavior can be interpreted geometrically in terms of orbits on the Bloch sphere. These results are of general applicability to more commonly used fields, such as sinusoidal driving, which display a similar phenomenology.

Research Projects

Organizational Units

Journal Issue

Description

© EDP Sciences. The author gratefully acknowledges the hospitality of the University of Edinburgh, where this work was completed.

Unesco subjects

Keywords

Collections