Magnetic proximity enabled bulk photovoltaic effects in van der Waals heterostructures

Theoretical Understanding of Nonlinear Optical Properties in Solids: A Perspective

“…In addition to the shift current, the injection current and spin current are also recognized as key contributors to the second-order nonlinear optics. Typically employed in magnetic materials, these phenomena present distinct characteristics. − In nonmagnetic materials, the injection current vanishes under linearly polarized incident light, leading discussions to focus primarily on circularly polarized light. Recent advancements in two-dimensional magnetic materials have renewed interest in their electronic and optical properties, especially regarding their PBVE effect. − The breakdown of the time-reversal symmetry in magnetic materials allows for the generation of injection currents under linear illumination.…”

Enormous and Tunable Bulk Charge/Spin Photovoltaic Effect in Piezoelectric Binary Materials T-IV-VI and T-V-V

“…Among them, the conductivity of T-BiAs is the highest, with σ x x x , S z = 3285 μA/V 2 ·ℏ/2 e . According to previous studies on spin current, the semiconductor 2 H -MoS 2 ∼ 120 μA/V 2 ·ℏ/2 e , the antiferromagnetic (AFM) MnPSe 3 ∼ 10 μA/V 2 ·ℏ/2 e , and the magnetic topological quantum material bilayer AFM-MnBi 2 Te 4 ∼ 40 μA/V 2 ·ℏ/2 e . The spin current of T-XY is tens of times larger than them.…”

Light-Induced Topological Phase Transition with Tunable Layer Hall Effect in Axion Antiferromagnets

“…Since both systems are (inversion multiplies time reversal operations) symmetric, each state is doubly degenerate from both spin-up and spin-down channels. 53 To elucidate the topological transitions under normal incidence of circularly polarized light, we examine the Floquet−Bloch band evolution near the Fermi level. 54 Note that tangential incidence is ill-defined numerically, as the zdirection is assumed to be nonperiodic.…”

“…The bandgap values are 58.6 and 106.9 meV, respectively. Since both systems are scriptPT (inversion multiplies time reversal operations) symmetric, each state is doubly degenerate from both spin-up and spin-down channels …”