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We propose a quantum electronic device based on strained graphene nanoribbon.Mechanical strain, internal exchange field and spin-orbit couplings (SOCs) havebeen exploited as principle parameters to tune physical properties of thedevice. We predict a remarkable zero-field topological quantum phase transitionbetween the time-reversal-symmetry broken quantum spin hall (QSH) and quantumanomalous hall (QAH) states, which was previously thought to take place only inthe presence of finite magnetic field. We illustrate as intrinsic SOC is tuned,how two different helicity edge states located in the opposite edges of thenanoribbon exchange their locations. Our results indicates that pseudomagneticfield induced by the strain could be coupled to the spin degrees of freedomthrough the SOC responsible for the stability of QSH state. The controllabilityof this zero-field phase transition with strength and direction of the strainis also demonstrated. Our prediction offers a tempting prospect of strain,electric and magnetic manipulation of the QSH effect.

Zero-field and time-reserval-symmetry-broken topological phase transitions in graphene