Orbital contribution to the regulation of the spin-valley coupling in antiferromagnetic monolayer 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>MnPTe</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Zhou, Wenzhe; Zheng, Guibo; Li, Aolin; Zhang, Dehe; Ouyang, Fangping

doi:10.1103/physrevb.107.035139

Cited by 10 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Upon taking SOC into consideration, the degeneracy of the K and K' valleys is lifted, leading to a spontaneous valley polarization of 9.2 meV in the conduction band, just as predicted by the k∙p model. This value is smaller than those of MnPSe 3 (43 meV), [ 20 ] V‐pyrazine (10 meV), [ 41 ] and MnPTe 3 (46 meV), [ 45 ] but comparable with that of V‐pyrazine (10 meV). [ 41 ] As shown in the Figure 3d, the energies of the valance band at the K and K' points are also different, but unfortunately, the VBM is located between the K point and Γ point, not at the K point.…”

Section: Resultsmentioning

confidence: 84%

Strain‐Valley Coupling in 2D Antiferromagnetic Lattice

Liu,

Feng,

Zhang

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

In recent years, 2D valley physics has attracted tremendous attention in both fundamental research and device applications. The search for a coupling valley with exotic physical properties can enable the exploration of novel quantum devices and is therefore of significant interest. Here, using model analysis, a novel mechanism is proposed that realizes strong coupling between strain and valley physics in a 2D antiferromagnetic honeycomb lattice in a controllable fashion. This idea is to modulate the exchange interactions through strain, thereby mediating the inversion and time‐reversal symmetries. As valley physics are connected with the symmetries, this enables a strong strain‐valley coupling. On the basis of first‐principles calculations, the validity of this mechanism is further demonstrated in a series of single‐layer systems, i.e., AuCl3, CrI3, and VPTe3, which are predicted to host valley polarization and anomalous valley Hall effect. The change in bonding angle is found to play a crucial role in mediating the exchange interaction and thus the strain‐valley coupling process. The microscopic origin is also discussed. These explored phenomena and insights greatly enrich the valley physics and 2D materials research.

show abstract

Section: Resultsmentioning

confidence: 84%

Strain‐Valley Coupling in 2D Antiferromagnetic Lattice

Liu,

Feng,

Zhang

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…These observations stem from the fact that the SOC effect is stronger for heavier atoms. Besides, the energy splitting at the valley states is positively correlated with the ratio of atomic orbital compositions . Due to the ratio of p x and p y states of the Sb atom in α′-PbSb higher than in α′-SnSb by around 5%, a larger valley spin splitting occurs in the valence band of α′-PbSb.…”

Section: Resultsmentioning

confidence: 94%

Ab Initio Discovery of Group IV–V Monolayers with Superlative Mechanical, Electronic, and Transport Properties

Sheng,

Wang

2024

Crystal Growth & Design

View full text Add to dashboard Cite

Much effort has been made to discover new two-dimensional semiconductors with exotic properties for exciting applications. Herein, we predict a class of group IV−V monolayers by first-principles calculations with chemical stoichiometry α′-M IV X V (M = C, Si, Ge, Sn, Pb; X = N, P, As, Sb, Bi), which consist of four sublayers in the M-X-X-M rather than the earlier extensively reported X-M-M-X stacking sequence. Among these 25 allotropes, we identify that 19 combinations hold great possibility to be realized in experiments by securing their robust bonding, energetic, dynamical, thermal, and mechanical stabilities. Electronic band structures reveal that except for 3 metallic materials verified by the HSE06 hybrid functional in the presence of the spin−orbit coupling (SOC) effect, the remaining 16 monolayers are intrinsic semiconductors due to the absence of surface dangling bonds, whose direct or indirect bandgaps range from 0.01 to 1.23 eV at the PBE + SOC level. Also, it is found that all of these semiconductors exhibit a pair of inequivalent K valleys in the conduction and valence bands. The strong SOC effect in semiconductors made up of heavy elements leads to the remarkable valley spin splitting in the absence of inversion symmetry. The robust spin-valley locking can not only realize the coexistence of spin and valley Hall effects but also achieve fascinating valley polarization by the irradiation of circularly polarized infrared light. The ultrahigh ultimate tensile strengths endow these semiconducting systems with superior tailored properties. Their considerable and anisotropic mobilities facilitate fast carrier transportation and exciton separation efficiency. Overall, these appealing properties along with viable synthesizability will provide semiconducting α′-M IV X V monolayers with tremendous opportunities in a broad variety of potential applications.

show abstract

“…The tellurium crystal and compounds generally exhibit prominent SOC effects [17][18][19][20] . A good example is the tellurium solid with a chiral space group (P3 1 21 or P3 2 21), which has been demonstrated to possess a radial spin texture.…”

Section: Introductionmentioning

confidence: 99%

Cluster-assembled superatomic crystals for chirality-dependent charge-to-spin conversion

Zhao,

Guo

et al. 2023

npj Quantum Mater.

View full text Add to dashboard Cite

In chiral materials, spins and chirality are coupled via spin-orbit interaction, provoking a fast-growing field of chiral spintronics. Compared with the widely explored chiral molecules, exploration of chirality-dependent spin effects in crystals and supramolecules remain limited. Here we assemble chiral superatomic crystals MXTe4 (M = transition metal; X = Ga or Ge) using telluride tetrahedra clusters as building blocks. Distinct from atomic crystals, these assembled monolayers have tunable symmetries and electronic characteristics by tilting the tetrahedral units through the variation of inter-cluster interaction. Dresselhaus-type spin textures and anisotropic spin Hall effect with inversed sign of spin current under opposite geometrical handedness are demonstrated in these chiral monolayers by symmetry analysis and verified by ab initio calculations. These results provide an innovative paradigm for assembling superatomic crystals with designated symmetry and hierarchical structures to access the chirality-driven quantum effects.

show abstract

Orbital contribution to the regulation of the spin-valley coupling in antiferromagnetic monolayer MnPTe3

Cited by 10 publications

References 36 publications

Strain‐Valley Coupling in 2D Antiferromagnetic Lattice

Strain‐Valley Coupling in 2D Antiferromagnetic Lattice

Ab Initio Discovery of Group IV–V Monolayers with Superlative Mechanical, Electronic, and Transport Properties

Cluster-assembled superatomic crystals for chirality-dependent charge-to-spin conversion

Contact Info

Product

Resources

About