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Highly entangled excitations such as Majorana fermions of Kitaev quantum spinliquids have been proposed to be utilized for future quantum science andtechnology, and a deeper understanding of such excitations has been stronglydesired. Here we demonstrate that Majorana fermion's mass and associatedtopological quantum phase transitions in the Kitaev quantum spin liquids may bemanipulated by using electric fields in sharp contrast to the common beliefthat an insulator is inert under weak electric fields due to charge energygaps. Using general symmetry analysis with perturbation and exactdiagonalization, we uncover the universal phase diagrams with electric andmagnetic fields. We also provide distinctive experimental signatures toidentify Kitaev quantum spin liquids with electric fields, especially inconnection with the candidate materials such as $\alpha$-RuCl3.

Manipulating Topological Quantum Phase Transitions of Kitaev's Quantum Spin Liquids with Electric Fields