Reversible engineering of spin-orbit splitting in monolayer MoS2 via laser irradiation under controlled gas atmospheres

Nanoscale ◽  
2021 ◽  
Author(s):  
Xilong Liang ◽  
Chengbing Qin ◽  
Yan Gao ◽  
Shuangping Han ◽  
Guofeng Zhang ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Transition Metal Dichalcogenides ◽  
Inversion Symmetry ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Monolayer Mos2 ◽  
Orbit Splitting ◽  
Spin Orbit Splitting ◽  
Metal Dichalcogenides ◽  
Strong Spin

Monolayer transition metal dichalcogenides, manifesting strong spin-orbit coupling combined with broken inversion symmetry, lead to a coupling of spin and valley degrees of freedom. These unique features make them highly...

scholarly journals Rydberg series of dark excitons and the conduction band spin-orbit splitting in monolayer WSe2

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Piotr Kapuściński ◽  
Alex Delhomme ◽  
Diana Vaclavkova ◽  
Artur O. Slobodeniuk ◽  
Magdalena Grzeszczyk ◽  
...  
Keyword(s):  
Conduction Band ◽  
Transition Metal Dichalcogenides ◽  
Spin Orbit ◽  
Rydberg Series ◽  
Orbit Splitting ◽  
Spin Orbit Splitting ◽  
Strong Coulomb ◽  
Metal Dichalcogenides ◽  
The Rich ◽  
Coulomb Correlations

AbstractStrong Coulomb correlations together with multi-valley electronic bands in the presence of spin-orbit interaction are at the heart of studies of the rich physics of excitons in monolayers of transition metal dichalcogenides (TMD). Those archetypes of two-dimensional systems promise a design of new optoelectronic devices. In intrinsic TMD monolayers the basic, intravalley excitons, are formed by a hole from the top of the valence band and an electron either from the lower or upper spin-orbit-split conduction band subbands: one of these excitons is optically active, the second one is dark, although possibly observed under special conditions. Here we demonstrate the s-series of Rydberg dark exciton states in tungsten diselenide monolayer, which appears in addition to a conventional bright exciton series in photoluminescence spectra measured in high in-plane magnetic fields. The comparison of energy ladders of bright and dark Rydberg excitons is shown to be a method to experimentally evaluate one of the missing band parameters in TMD monolayers: the amplitude of the spin-orbit splitting of the conduction band.

scholarly journals Dzyaloshinskii–Moriya interaction in noncentrosymmetric superlattices

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Woo Seung Ham ◽  
Abdul-Muizz Pradipto ◽  
Kay Yakushiji ◽  
Kwangsu Kim ◽  
Sonny H. Rhim ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Degrees Of Freedom ◽  
Orbit Coupling ◽  
Inversion Symmetry ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Band Formation ◽  
Research Activities ◽  
Moriya Interaction

AbstractDzyaloshinskii–Moriya interaction (DMI) is considered as one of the most important energies for specific chiral textures such as magnetic skyrmions. The keys of generating DMI are the absence of structural inversion symmetry and exchange energy with spin–orbit coupling. Therefore, a vast majority of research activities about DMI are mainly limited to heavy metal/ferromagnet bilayer systems, only focusing on their interfaces. Here, we report an asymmetric band formation in a superlattices (SL) which arises from inversion symmetry breaking in stacking order of atomic layers, implying the role of bulk-like contribution. Such bulk DMI is more than 300% larger than simple sum of interfacial contribution. Moreover, the asymmetric band is largely affected by strong spin–orbit coupling, showing crucial role of a heavy metal even in the non-interfacial origin of DMI. Our work provides more degrees of freedom to design chiral magnets for spintronics applications.

scholarly journals Optoelectronics with single layer group-VIB transition metal dichalcogenides

Nanophotonics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 1589-1600 ◽  
Author(s):  
M.A. Khan ◽  
Michael N. Leuenberger
Keyword(s):  
Transition Metal ◽  
Electronic Devices ◽  
Transition Metal Dichalcogenides ◽  
Single Layer ◽  
Spin Orbit Coupling ◽  
Electroluminescent Devices ◽  
Metal Dichalcogenides ◽  
Fundamental Research ◽  
Excitonic Effects ◽  
Strong Spin

AbstractThe discovery of two-dimensional (2D) materials has opened up new frontiers and challenges for exploring fundamental research. Recently, single-layer (SL) transition metal dichalcogenides (TMDCs) have emerged as candidate materials for electronic and optoelectronic applications. In contrast to graphene, SL TMDCs have sizable band gaps that change from indirect to direct in SLs, which is useful in making thinner and more efficient electronic devices, such as transistors, photodetectors, and electroluminescent devices. In addition, SL TMDCs show strong spin-orbit coupling effects at the valence band edges, giving rise to the observation of valley-selective optical excitations. Here, we review the basic electronic and optical properties of pure and defected group-VIB SL TMDCs, with emphasis on the strong excitonic effects and their prospect for future optoelectronic devices.

Hall and Nernst effects in monolayer MoS2

2016 ◽  
Vol 30 (08) ◽  
pp. 1650041 ◽  
Author(s):  
Yun-Hai Zhang ◽  
Ming-Hua Zhang
Keyword(s):  
Low Temperature ◽  
Temperature Gradient ◽  
Spin Orbit ◽  
Zero Temperature ◽  
Monolayer Mos2 ◽  
Orbit Splitting ◽  
Berry Curvature ◽  
System Transition ◽  
Spin Orbit Splitting ◽  
Study Hall

We study Hall and Nernst transports in monolayer MoS2based on Green’s function formalism. We have derived analytical results for spin and valley Hall conductivities in the zero temperature and spin and valley Nernst conductivities in the low temperature. We found that tuning of the band gap and spin-orbit splitting can drive system transition from spin Hall insulator (SHI) to valley Hall insulator (VHI). When the system is subjected to a temperature gradient, the spin and valley Nernst conductivities are dependent on Berry curvature.

The calculation of spin-orbit splitting and g tensors for small molecules and radicals

1973 ◽  
Vol 332 (1590) ◽  
pp. 365-384 ◽  
Keyword(s):  
Order Effects ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Orbit Splitting ◽  
First Order ◽  
Spin Orbit Splitting ◽  
Approximate Form ◽  
Firm Basis ◽  
Semi Empirical ◽  
Good Agreement

The spin-orbit coupling terms in the molecular electronic Hamiltonian have important, spectroscopically observable, effects. In states possessing an orbital degeneracy (e.g. II states of diatomic molecules) they produce a first-order splitting of the various multiplet levels; and in states which are degenerate in spin only the y give second-order effects embodied in a n effective g tensor. Owing to the complexity of the spin-orbit operators, such effects are usually discussed using simple approximate form s and semi-empirical wave-functions. In this paper, the complete operators are employed in ab initio calculations of (i) the spin-orb it splitting of the 2 II ground states of NO and CH, and (ii) the g tensors of CN and NO 2 . The results are in good agreement with experiment. Detailed analysis of the calculations indicates a firm basis for semi-empirical procedures which could easily be applied to larger molecules. The evaluation of new integrals, involving the spin-orbit operators, is discussed in an appendix.

scholarly journals Strong Spin-Orbit Splitting on Bi Surfaces

2004 ◽  
Vol 93 (4) ◽  
Author(s):  
Yu. M. Koroteev ◽  
G. Bihlmayer ◽  
J. E. Gayone ◽  
E. V. Chulkov ◽  
S. Blügel ◽  
...  
Keyword(s):  
Spin Orbit ◽  
Orbit Splitting ◽  
Spin Orbit Splitting ◽  
Strong Spin
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