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What Has Been Achieved:
A family of longstanding mis-assignments of Raman signatures in 2D transition metal dichalcogenides has been corrected by the collaboration between double resonance Raman spectroscopy experiments and first-principles calculations. Selection rules for intervalley scattering processes in MoS2 have been derived from group theory and verified from first-principles.
Importance of Achievement:
What Has Been Achieved:
Finite-length grain boundaries and their topographic control using curved substrates are predicted from accurate empirical forcefield calculations.
Importance of Achievement:
The study expands the scope and generalize the concept of grain boundaries, introducing a method of controlling the density and detailed geometry of grain boundaries that is general to all 2D materials.
Unique Features of the MIP That Enabled Project:
What Has Been Achieved:
The new ReaxFF reactive potential developed for this project accurately describes both equilibrium properties and also mechanical deformations and structural defects within MoS2 , a promising material for nanoelectronics. A new type of “ripple” defect has been identified as a favorable host for sulfur vacancy defects.
Importance of Achievement:
The strongly spin-momentum coupled electronic states in topological insulators (TI) have been extensively pursued to realize efficient magnetic switching. However, previous studies show a large discrepancy of the charge-spin conversion efficiency. Moreover, current-induced magnetic switching with TI can only be observed at cryogenic temperatures. We report spin-orbit torque switching in a TI-ferrimagnet heterostructure with perpendicular magnetic anisotropy at room temperature. The obtained effective spin Hall angle of TI is substantially larger than the previously studied heavy metals.
