scholarly journals Spin dynamics in bilayer graphene: Role of electron-hole puddles and Dyakonov-Perel mechanism

2016 ◽  
Vol 94 (4) ◽  
Author(s):  
Dinh Van Tuan ◽  
Shaffique Adam ◽  
Stephan Roche
Keyword(s):  
Spin Dynamics ◽  
Bilayer Graphene ◽  
Electron Hole

scholarly journals Chemical potential and quantum Hall ferromagnetism in bilayer graphene

Science ◽  
2014 ◽  
Vol 345 (6192) ◽  
pp. 58-61 ◽  
Author(s):  
Kayoung Lee ◽  
Babak Fallahazad ◽  
Jiamin Xue ◽  
David C. Dillen ◽  
Kyounghwan Kim ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Chemical Potential ◽  
Hexagonal Boron Nitride ◽  
Quantum Hall ◽  
Bilayer Graphene ◽  
Zero Magnetic Field ◽  
High Magnetic Fields ◽  
Complex Interplay ◽  
Electron Hole ◽  
Quantum Hall State

Bilayer graphene has a distinctive electronic structure influenced by a complex interplay between various degrees of freedom. We probed its chemical potential using double bilayer graphene heterostructures, separated by a hexagonal boron nitride dielectric. The chemical potential has a nonlinear carrier density dependence and bears signatures of electron-electron interactions. The data allowed a direct measurement of the electric field–induced bandgap at zero magnetic field, the orbital Landau level (LL) energies, and the broken-symmetry quantum Hall state gaps at high magnetic fields. We observe spin-to-valley polarized transitions for all half-filled LLs, as well as emerging phases at filling factors ν = 0 and ν = ±2. Furthermore, the data reveal interaction-driven negative compressibility and electron-hole asymmetry in N = 0, 1 LLs.

scholarly journals Instability of the marginal commutative model of tunneling centers interacting with a metallic environment: Role of the electron-hole symmetry breaking

1997 ◽  
Vol 56 (20) ◽  
pp. 12947-12960 ◽  
Author(s):  
A. Zawadowski ◽  
G. Zaránd ◽  
P. Nozières ◽  
K. Vladár ◽  
G. T. Zimányi
Keyword(s):  
Symmetry Breaking ◽  
Electron Hole ◽  
Tunneling Centers

Phonon Coupling and Dielectric Response in 2D Semiconductor

NANO ◽  
2021 ◽  
Author(s):  
Arslan Usman ◽  
Abdul Sattar ◽  
Hamid Latif ◽  
Muhammad Imran
Keyword(s):  
Transition Metal Dichalcogenides ◽  
Coupling Mechanism ◽  
Two Dimensional ◽  
Electron Hole ◽  
Exciton Coupling ◽  
Gain Energy ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal ◽  
The Impact

The impact of phonon and their surrounding environment on exciton and its complexes were investigated in monolayer WSe2 semiconductor. Phonon up-conversion has been studied in past for conventional III–V semiconductors, but its role in two-dimensional layered transition metal dichalcogenides has rarely been explored. We investigated the photoluminescence up-conversion mechanism in WSe2 monolayer and found that a lower energy photon gain energy upto 64[Formula: see text]meV to be up-converted to emission photon at room temperature. Moreover, the phonon-exciton coupling mechanism has also been investigated and the role of dielectric screening has been explored to get complete insight of coulomb’s interaction in these electron-hole pairs. Investigations of charge carrier’s lifetime reveal that boron nitride encapsulated monolayer has shorter recombination time as low as 41 ps as compared to a bare monolayer on SiO2 substrate. These results are very promising for realizing spintronics-based application from two-dimensional layered semiconductors.

Role of Coulomb-correlated electron-hole pairs in ZnSe-based quantum-well diode lasers

1994 ◽  
Vol 50 (8) ◽  
pp. 5787-5790 ◽  
Author(s):  
J. Ding ◽  
M. Hagerott ◽  
P. Kelkar ◽  
A. V. Nurmikko ◽  
D. C. Grillo ◽  
...  
Keyword(s):  
Quantum Well ◽  
Diode Lasers ◽  
Electron Hole ◽  
Correlated Electron

scholarly journals All-optical study of tunable ultrafast spin dynamics in [Co/Pd]/NiFe systems: the role of spin-twist structure on Gilbert damping

RSC Advances ◽  
2016 ◽  
Vol 6 (83) ◽  
pp. 80168-80173 ◽  
Author(s):  
Chandrima Banerjee ◽  
Semanti Pal ◽  
Martina Ahlberg ◽  
T. N. Anh Nguyen ◽  
Johan Åkerman ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Optical Study ◽  
Gilbert Damping ◽  
Spin Configuration ◽  
Exchange Spring ◽  
Static Spin ◽  
All Optical ◽  
Magnetization Precession ◽  
Twist Structure

The competing magnetic anisotropies and the interfacial properties are found to control the static spin configuration and ultrafast demagnetization, magnetization precession and damping in [Co/Pd]/NiFe(t) exchange spring samples.

Exploring the role of electron-hole scavengers on optimizing the photocatalytic performance of BiVO4

2018 ◽  
Vol 5 (10) ◽  
pp. 21703-21709 ◽  
Author(s):  
Mohamad Fakhrul Ridhwan Samsudin ◽  
Lim Tau Siang ◽  
Suriati Sufian ◽  
Robabeh Bashiri ◽  
Norani Muti Mohamed ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Electron Hole
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