Magnetic and Ferroelectric Manipulation of Valley Physics in Janus Piezoelectric Materials

Abstract

The realization of multiferroic materials offers the possibility of multifunctional electronic device design. However, the coupling between the multiferroicity and piezoelectricity in Janus materials is rarely reported. In this study, we propose a mechanism for manipulating valley physics by magnetization reversing and ferroelectric switching in multiferroic and piezoelectric material. The ferromagnetic VSiGeP4 monolayer exhibits a large valley polarization up to 100 meV, which can be effectively operated by reversing magnetization. Interestingly, the antiferromagnetic VSiGeP4 bilayers with AB and BA stacking configurations allow the coexistence of valley polarization and ferroelectricity, supporting the proposed strategy for manipulating valley physics via ferroelectric switching and interlayer sliding. In addition, the VSiGeP4 monolayer contains remarkable tunable piezoelectricity regulated by electron correlation U. This study proposes a feasible idea for regulating valley polarization and a general design idea for multifunctional devices with multiferroic and piezoelectric properties, facilitating the miniaturization and integration of nanodevices.

Realization of Dual Anomalous Valley Hall Effect in Antiferromagnetic HfN2/MnPSe3 Heterostructure

“…Hence, valley pseudospin will be selectively manipulated for HfN 2 /MnPSe 3 HTS and measured with a voltmeter. This platform facilitates the practical implementation of valleytronic materials, encompassing storage and data processing functionalities. − …”

Novel valley character and tunable quasi-half-valley metal state in Janus monolayer VSiGeP4

“…The value of the optimized lattice constant a of ML VSiGeP 4 (3.56 Å) is consistent with the relevant report. 51 To verify the dynamic stability of ML VSiGeP 4 , as shown in Fig. 2(c), the phonon band structure is calculated.…”

How to produce spin-splitting in antiferromagnetic materials

“…A typical example is half-metallic ferromagnet, which possesses 100% spin-polarized current [6]. For ferrovalley materials, valley splitting can also be observed besides spin splitting [7][8][9][10][11]. Superior to ferromagnetic (FM) materials, the antiferromagnetic (AFM) materials have attracted considerable research interest, since they are robust to external magnetic perturbation due to missing any net magnetic moment [12,13].…”