You are warmly invited to attend seminar #10 of the QST Seminar Series 2023/2024 in Naples.

Speaker: Francesco Di Colandrea (UNINA & UOttawa)

Title: "Direct measurement of the quantum metric"

Time/Location: Fri, May 31, 2024 at 14:00 in Aula 2G26 - Department of Physics - Federico II

Online: Online participation via MS Teams link. IMPORTANT: In case your access is denied, log out from your institutional account and open MS Teams in your web browser.

Abstract: The quantum dynamics of two-band wavepackets is controlled by the quantum geometric tensor [1]. The Berry curvature (the imaginary part of the tensor) accounts for adiabatic trajectories, while the quantum metric (the real part of the tensor) describes non-adiabatic corrections. The quantum metric also features a fundamental geometrical interpretation, expressing the distance between the system eigenstates [2]. It has been linked to relevant phenomena, such as flat-band superfluidity, exciton Lamb shift, and orbital magnetic susceptibility. We show that, in chiral-symmetric systems, the quantum metric can be retrieved by measuring the mean chiral displacement of delocalized wavefunctions. Interestingly, an appropriate gauge choice allows linking the quantum metric to the Berry connection. These findings are experimentally demonstrated in a topological quantum walk of structured light [3].

[1] O. Bleu, G. Malpuech, Y. Gao, and D. D. Solnyshkov, Phys. Rev. Lett. 121, 020401 (2018).
[2] J. Provost and G. Vallee, Commun. Math. Phys. 76, 289 (1980).

[3] F. Di Colandrea et al., arXiv: 2401.07946

Short Bio: Francesco Di Colandrea is a Researcher at UNINA and visiting fellow at UOttawa.

The QST Seminars Group

Past and upcoming seminars are posted on our website https://www.qst.unina.it/?page_id=605(opens%20in%20a%20new%20tab.