Schimpf, Alina M. Rinehart, Jeffrey D. Ochsenbein, Stefan T. Gamelin, Daniel R. Charge-State Control of Mn<sup>2+</sup> Spin Relaxation Dynamics in Colloidal <i>n</i>‑Type Zn<sub>1–<i>x</i></sub>Mn<sub><i>x</i></sub>O Nanocrystals Colloidal diluted magnetic semiconductor (DMS) nanocrystals are model systems for studying spin effects in semiconductor nanostructures with relevance to future spin-based information processing technologies. The introduction of excess delocalized charge carriers into such nanocrystals turns on strong dopant–carrier magnetic exchange interactions, with important consequences for the physical properties of these materials. Here, we use pulsed electron paramagnetic resonance (pEPR) spectroscopy to probe the effects of excess conduction band electrons on the spin dynamics of colloidal Mn<sup>2+</sup>-doped ZnO nanocrystals. Mn<sup>2+</sup> spin–lattice relaxation is strongly accelerated by the addition of even one conduction band electron per Zn<sub>1–<i>x</i></sub>Mn<sub><i>x</i></sub>O nanocrystal, attributable to the introduction of a new exchange-based Mn<sup>2+</sup> spin relaxation pathway. A kinetic model is used to describe the enhanced relaxation rates, yielding new insights into the spin dynamics and electronic structures of these materials with potential ramifications for future applications of DMS nanostructures in spin-based technologies. exchange interactions;model systems;material;dynamic;future applications;technology;relaxation rates;introduction;delocalized charge carriers;nanocrystal;semiconductor nanostructures;conduction band electrons;Mn;conduction band electron;Zn;DMS nanostructures;relaxation pathway 2015-12-17
    https://acs.figshare.com/articles/journal_contribution/Charge_State_Control_of_Mn_sup_2_sup_Spin_Relaxation_Dynamics_in_Colloidal_i_n_i_Type_Zn_sub_1_i_x_i_sub_Mn_sub_i_x_i_sub_O_Nanocrystals/2050425
10.1021/acs.jpclett.5b00621.s001