$[14]$ Wang, Y., Mao, J., Meng, X., Yu, L., Deng, D., and Bao, X. Catalysis with Two-Dimensional Materials Confining Single Atoms: Concept, Design, and Applications. Experimental and modeling studies both will be done. The study of the effect on a series of samples of various doping levels evidences the presence of the two contributions. \par The degeneration is, in general, possible but, at large values of the zero sound velocity with respect to the Fermi velocity, caused by large values of the Landau parameterF 0 We succeeded in growing our first tandem solar cells by growing thick layers (>1 µm) of Si on an inverted AlGaAs solar cells followed by a TJ. Here we show that in fact a single nodal diamond-shaped electron pocket with concave sides produced by the latter unconventional scenario yields the observed experimental signatures in magnetotransport, negative Hall coefficient, and quantum oscillations in the negative Hall effect. Monolayer transition metal dichalcogenides (TMDs) with strong spin-orbit coupling combined with broken inversion symmetry, leading to a coupling of spin and valley degrees of freedom, make these materials highly interesting for potential spintronics and valleytronic applications. An excellent agreement between the experimental data and the results of calculations using semiclassical nonlocal dielectric response model confirms the validity of the method and paves the way for the realization of excitonic Datta-Das transistors. A new and coherent interstitial-ice model for pure water part II: explaining the conflicting Hall data. On the other hand, at fixed temperature and variable illumination intensity, the photocurrent follows the relation IphFn (the value of the exponent, n, decreases with decreasing temperature). Apart from this, analytical method (like renormalization group theory) has been implemented to corroborate with the simulation results. \par We reach an efficiency of 17.6 % for a single Al0.22GaAs solar cell. However, the conventional approaches for excitation of spin currents based on spin-pumping and spin Hall effect are limited in efficiency which restricts their application for viable spintronic devices. The stresses in large-area epilayer - substrate structures are easy to model because substrate distortion can be neglected and strain in the epilayer is a simple biaxial tetragonal distortion. \par The hole-relaxation time that was determined from the Hall mobility data was observed to increase with decreasing temperature. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, By continuing to browse this site, you agree to its use of cookies as described in our, This is an outdated version. ratio of the two quantities being constant over the whole temperature range, suggesting that the origin of the anomalous Hall effect is intrinsic. A second contribution to the spin-dependent Hall effect is the skew scattering, due to a left-right asymmetry of the scattering cross section. Also, this article concentrates on semiconductors, rather than metals or insulators, although the same theory generally applies. Next, we report the experimental study of the spin-dependent Hall effect in n-type indium antimonide. Zeitschrift für Physik B Condensed Matter. $\it{Physics\, Review\, Applied}$, 10: 034070, 2018.\\ It is experimentally demonstrated that optical surface modes localized at the PC surface covered by ferromagnetic layer and materials with giant spin-orbit coupling (SOC) notably increase the efficiency of the optically-induced spin current generation and provides its tunability by modifying light wavelength or angle of incidence. As per the objectives in the present thesis, the main focus will be directed on electronic structure, topological effects and magnetic properties of 2D vdW quantum systems within the framework of first principle based simulations supported by respective renormalized group theory based analytical method and appropriate experimental collaboration. Edges of a stripe relax stress in the stripes and induce stress in the substrate. Titanium dioxide has shown promise as the basis for a thermoelectric material as it is an excellent thermal insulator and is able to be alloyed, in this case with germanium, to enhance electrical properties. Explicit dependence of surface scattering intensity on the angle of electron slide and on microscopical parameters of the problem was analyzed. $\bf{Chapter\, 4}$ mentions the efficacy of 2D vdW graphene/MoS$_2$ heterostructure upon doping compared to its pristine form for ionic transport as replaceable electrocatalyst over conventional ones. Data are taken at T 0 30 K; a linear background has been subtracted from each B ext scan. On the peculiarities of galvanomagnetic effects in high magnetic fields in twisting bicrystals of th... Magnetoresistance and Hall effect near the metal-insulator transition of n -type Cd 0.95 Mn 0.05 Te. However, engineering the spin-orbit coupling (SOC) at room temperature as demand after device fabrication is still a great challenge for their practical applications. HALL EFFECT AND RESISTIVITY MEASUREMENTS IN DOPED GAAS Using the de nition of the Hall coe cient R H = E H J xB z; (14.10) we obtain the Hall coe cient for electrons R H = 1 en: (14.11) For a p-type semiconductor, the equation is similar to Equation14.11; you should derive this equation as an exercise. 0a (C and D) Spatial profile of A 0 for E // [110] and E // [110], respectively. (A) Spatial profiles of n s for E 0 2.5, 5, and 10 mV mm –1 at T 0 30 K in the strained InGaAs sample. 4 EXPERIMENT 14. In0.53Ga0.47As/In0.52Al0.48As Since stresses in the stripe and the substrate are coupled, calculation of stresses in stripes and substrates is more involved. A model based on the coupled Landau-Lifschitz-Gilbert equations shows that the reversal current density is proportional to the effective perpendicular anisotropy, which does not decrease at the compensation point. These time-domain EPR measurements reveal a significant magnetic field dependence of the Mn transverse spin relaxation time. This inverted the Hall effect in a parallelepipedic semiconductor sample of sizes a, b, c (see Figure 1). In full analogy with the spin-orbit transistor proposed by Datta and Das [Appl. Hall effect experiments showed that one (chalcopyrite A) belonged to p-type chalcopyrite whose carrier concentrations were high, while the other two (chalcopyrite B and C) were both n-type chalcopyrite whose carrier concentrations were low. DFT) in one system to validate its realization covers its novelty aspect. The observed field dependences consist of symmetric and asymmetric contributions. This takes advantage of the so-called chiral Purcell effect to modulate the valley dynamic of a monolayer WSe2 [186]. $\bf{Chapter\, 5}$ summaries the topological effects and effective electron mobility in h-BN through free standing graphene substrate based graphene/h-BN heterostructure for dual-gate field-effect transistor (DG-FET) device applications. Essentially, SOC plays a crucial role in condensed-matter physics and accounts for a broad range of fascinating phenomena, such as spin Hall effects, Employing all optical probing technique to measure and quantize electric field profile in ultra wide band-gap semiconductor devices. In this case, dislocation densities in each 〈110〉 direction are equal to within experimental error while an asymmetry in in‐plane strain is measured (18% and 30% for x=0.07, 300, and 580 nm thick, respectively). Moreover, the 2D honeycomb layers are prone to form various crystallographic reconstructions, with structural variations as compared to their pristine monolayer system. The electron microscopy shows that in the thinnest dislocated films (90 and 160 nm, x=0.07) 60° α dislocations form first in one 〈110〉 direction at the interface. strongly limits the opportunities to exploit the wave nature in a magnonic crystal filtering device. More than 600 GaN samples have been investigated in our laboratory or sent out since the inception of the program, and much has been learned about this important material.