Phys.org November 30, 2024
Researchers in Italy investigated the performance of a one-dimensional dimerized chain as a spin quantum battery. Integrable model showed a rich quantum phase diagram that emerged through a mapping of the spins onto auxiliary fermionic degrees of freedom. They used a charging protocol relying on the double quench of an internal parameter, the strength of the dimerization, and addressed the energy stored in the systems. They observed three distinct regimes, depending on the timescale characterizing the duration of the charging: a short-time regime related to the dynamics of the single dimers, a long-time regime related to the recurrence time of the system at finite size, and a thermodynamic limit time regime. In the latter, the energy stored was almost unaffected by the charging time and the precise values of the charging parameters, provided the quench crossed a quantum phase transition. They analytically proved that the three-timescale behavior and the strong dependence of the energy stored on the quantum phase diagram also hold in the quantum Ising chain in a transverse field. According to the researchers their results could play a relevant role in the design of stable solid-state quantum batteries… read more. TECHNICAL ARTICLE
The right panel shows a plot of the energy stored in the QB over time… Credit: Phys. Rev. Lett. 133, 197001, 7 November, 2024