Circular-polarized-light-induced spin polarization characterized for the Dirac-cone surface state at W(110) with C2v symmetry

Abstract

The C2v surface symmetry of W(110) strongly influences a spin-orbit-induced Dirac-cone-like surface state and its characterization by spin- and angle-resolved photoelectron spectroscopy. In particular, using circular polarized light, a distinctive k-dependent spin texture is observed along the direction of the surface Brillouin zone. For all spin components Px, Py, and Pz, non-zero values are detected, while the initial-state spin polarization has only a Py component due to mirror symmetry. The observed complex spin texture of the surface state is controlled by transition matrix element effects, which include orbital symmetries of the involved electron states as well as the geometry of the experimental set-up.

Chiro‐Optoelectronic Encodable Multilevel Thin Film Electronic Elements with Active Bio‐Organic Electrolyte Layer

“…[5][6][7][8] Cases of information exchange via linear and circular can be found in modern information technology [9][10][11][12] and spintronics effects. [13] Nature-inspired It is suggested that chiral photonic bio-enabled integrated thin-film electronic elements can pave the base for next-generation optoelectronic processing, including quantum coding for encryption as well as integrated multi-level logic circuits. Despite recent advances, thin-film electronics for encryption applications with large-scale reconfigurable and multi-valued logic systems are not reported to date.…”

“…[ 5–8 ] Cases of information exchange via linear and circular can be found in modern information technology [ 9–12 ] and spintronics effects. [ 13 ] Nature‐inspired chiral architectures have been applied to smart materials and sensors to modulate stimulus‐response behavior through selective light reflection and diffraction as controlled by environmental conditions such as humidity, heat, stress, current, and pH. [ 14–19 ] Such chiral assembled structures can be realized with crystalline TiO 2 microspheres, [ 20 ] thiol‐acrylate chemistry, [ 21 ] and semi‐interpenetrating polymer networks.…”

Optical Mode Tuning of Monolayer Tungsten Diselenide (WSe2) by Integrating with One-Dimensional Photonic Crystal through Exciton–Photon Coupling

“…However, because of the inter-valley scattering present in TMDs, the mechanism of valley depolarization is convoluted, resulting in a significant drop in the degree of valley polarization under room temperature [ 14 ]. Circular polarized light is very important for many important applications, such as circular dichroism spectroscopy [ 15 ], magnetic imaging [ 16 ], spintronics [ 17 ], quantum computing [ 18 , 19 ], optical communication [ 20 ], and manipulation of quantum states [ 21 ]. Controlling CP states of the light in TMDs will result in circular dichroism (CD), which is a phenomenon that occurs when light passes through a certain medium and splits into left-hand CP (LCP) and right-hand CP (RCP) polarization states.…”

Combining Soft with Hard Condensed Matter for Circular Polarized Light Sensing and Logic Operations

“…[ 11–15 ] More specifically for CPL, the two polarization states (left and right) find application in advanced fields, such as spintronics. [ 16 ] As such, the potential use of CPL in information technology is recognized; however, emissions and detections without bulky optical elements has been a great challenge and is not an option in a miniaturization‐oriented society.…”