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Two-dimensional (2D) topological insulator (TI) have been recognized as a newclass of quantum state of matter. They are distinguished from normal 2Dinsulators with their nontrivial band-structure topology identified by the$Z_2$ number as protected by time-reversal symmetry (TRS). 2D TIs haveintriguing spin-velocity locked conducting edge states and insulatingproperties in the bulk. In the edge states, the electrons with opposite spinspropagate in opposite directions and the backscattering is fully prohibitedwhen the TRS is conserved. This leads to quantized dissipationless "two-lanehighway" for charge and spin transportation and promises potentialapplications. Up to now, only very few 2D systems have been discovered topossess this property. The lack of suitable material obstructs the furtherstudy and application. Here, by using first-principles calculations, we proposethat the functionalized MXene with oxygen, M$_2$CO$_2$ (M=W, Mo and Cr), are 2DTIs with the largest gap of 0.194 eV in W case. They are dynamically stable andnatively antioxidant. Most importantly, they are very likely to be easilysynthesized by recent developed selective chemical etching of transition-metalcarbides (MAX phase). This will pave the way to tremendous applications of 2DTIs, such as "ideal" conducting wire, multifunctional spintronic device, andthe realization of topological superconductivity and Majorana modes for quantumcomputing.

Large-Gap Two-Dimensional Topological Insulator in Oxygen Functionalized MXene