Abstract
In recent years, two-dimensional (2D) materials that have ferroelectric, valley polarization as well as topological order is a major focal topic of nanomaterials research. We studied the monolayer (ML) SbAs(CH2OCH3)2 based on first-principles calculations. The adsorption energy results and phono spectra results show that the structure are stable. The in-plane ferroelectricity can be adjusted by rotating functional groups, CH2OCH3-. Chosen a suitable substrate (for example, diagonal boron nitride), an in-plane electric field can be supplied to control the ferroelectric switch. The topological order can be adjusted by stress stretching. After 6% tensile stress, it represents the quantum spin Hall effect. Considering energy band of spin polarization, it shows that the spin-splitting Dirac states at the K and -K valleys have opposite spin moments. The discovery of coexisting ferroelectric, valley polarization and topology in functional 2D materials opens a way for non-volatile memory storage and spintronics applications.
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