Large-gap Two-dimensional Topological Insulator in Oxygen Functionalized MXene
By H. Weng, A. Ranjbar, Yunye Liang, Zhida Song, Mohammad Khazaei, Seiji Yunoki, M. Arai, Yoshiyuki Kawazoe, Z. Fang, X. Dai. 2015
214 citations recorded by the source corpus.
Two-dimensional (2D) topological insulator (TI) have been recognized as a new class of quantum state of matter. They are distinguished from normal 2D insulators with their nontrivial band-structure topology identified by the $Z_2$ number as protected by time-reversal symmetry (TRS). 2D TIs have intriguing spin-velocity locked conducting edge states and insulating properties in the bulk. In the edge states, the electrons with opposite spins propagate in opposite directions and the backscattering is fully prohibited when the TRS is conserved. This leads to quantized dissipationless "two-lane highway" for charge and spin transportation and promises potential applications. Up to now, only very few 2D systems have been discovered to possess this property. The lack of suitable material obstructs the further study and application. Here, by using first-principles calculations, we propose that the functionalized MXene with oxygen, M$_2$CO$_2$ (M=W, Mo and Cr), are 2D TIs with the largest gap of 0.194 eV in W case. They are dynamically stable and natively antioxidant. Most importantly, they are very likely to be easily synthesized by recent developed selective chemical etching of transition-metal carbides (MAX phase). This will pave the way to tremendous applications of 2D TIs, such as "ideal" conducting wire, multifunctional spintronic device, and the realization of topological superconductivity and Majorana modes for quantum computing.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/be41cd4a557d6e090f778f1a82068d59f54b4830
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In Atomic and Molecular Physics, and Optics
In Materials Chemistry
- Yury Gogotsi
- Husam N. Alshareef
- Hyunho Kim
- J. Rosen
- Seiji Yunoki
- Mohammad Khazaei
- Armin VahidMohammadi
- Zhenwei Wang
Citations in the corpus
- The world of two-dimensional carbides and nitrides (MXenes) (2021, background): “Similarly, some oxygen-terminated MXenes (Mo- and Cr-containing M2CO2 MXenes or Mo2TiC2O2 and Mo2Ti2O3 o-MXenes) have been predicted to be topological insulators when tailored with certain bandgaps (156, 157).”
- MXenes: focus on optical and electronic properties and corresponding applications (2020, background): “In addition, not only ordered double M MXenes but also mono M ones can be topological insulators, as examples include W2CO2, Mo2CO2, and Cr2CO2 [78].”
- Nearly free electron states in MXenes (2016, background): “Some of the MXenes are topological insulators [47,48].”