Evolution of the excited electron bubble in liquidH4eand the appearance of fission-like processes

AbstractIn recent experiments, external anisotropy has been a useful tool to tune different phases and study their competitions. In this paper, we look at the quantum Hall charge density wave states in the N = 2 Landau level. Without anisotropy, there are two first-order phase transitions between the Wigner crystal, the 2-electron bubble phase, and the stripe phase. By adding mass anisotropy, our analytical and numerical studies show that the 2-electron bubble phase disappears and the stripe phase significantly enlarges its domain in the phase diagram. Meanwhile, a regime of stripe crystals that may be observed experimentally is unveiled after the bubble phase gets out. Upon increase of the anisotropy, the energy of the phases at the transitions becomes progressively smooth as a function of the filling. We conclude that all first-order phase transitions are replaced by continuous phase transitions, providing a possible realisation of continuous quantum crystalline phase transitions.

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Enhancing photocatalytic performance by direct photo-excited electron transfer from organic pollutants to low-polymerized graphitic carbon nitride with more C-NH/NH2 exposure

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2021.120316 ◽

2021 ◽

pp. 120316

Author(s):

Fan Li ◽

Tong Li ◽

Lili Zhang ◽

Yang Jin ◽

Chun Hu

Keyword(s):

Electron Transfer ◽

Organic Pollutants ◽

Carbon Nitride ◽

Photocatalytic Performance ◽

Excited Electron ◽

Graphitic Carbon ◽

Graphitic Carbon Nitride

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Excited states of analogue models of M-bacteriochlorophylls (M = Mg, Zn) in the photosynthetic reaction center: a time-dependent density functional theory study

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424602000762 ◽

2002 ◽

Vol 06 (10) ◽

pp. 617-625 ◽

Cited By ~ 3

Author(s):

Yoichi Yamaguchi

Keyword(s):

Electron Transfer ◽

Excited States ◽

Density Functional ◽

Photosynthetic Reaction Center ◽

Excited Electron ◽

Time Dependent ◽

Analogue Model ◽

Functional Theory ◽

Special Pair ◽

Dependent Density

Using time-dependent density functional theory (TDDFT), the excited states of the analogue model Mg -bacteriochlorophyll b - imidazole ( BChl -Im) dimer (P) for a special pair in the photosynthetic reaction center (RC) of Rhodopseudomonas (Rps.) viridis were examined. The calculated low-lying excited states and optimal geometries are in good agreement with experimental data. The order of the lowest unoccupied molecular orbital (LUMO) energies of P, the monomeric "accessory" BChl -Im (B), and bacteriopheophytin b ( H ) indicates the possibility of the light-induced electron transfer from P to H via B. The Im ligand of B destabilizes Goutermann's four-orbitals of BChl by 0.3-0.4 eV. With no energetic difference in the LUMOs between H and BChl , the Im ligands of P and B play an important role in providing a greater energetic gradient to the LUMOs along with the pathway for the excited-electron transfer in RC, resulting in the reduced reverse electron transfer from H to P (via B). Thus it is expected that the asymmetric Mg -Im interactions will directly affect the pathway of the excited-electron transfer. Using the deformed heterodimer (P') formed by the BChl halves with and without Im as the primary donor model, its cation radical P'+ was calculated as to whether the experimental asymmetric spin-density distribution can reproduce. The excited states of the analogue model Zn - BChl -Im dimer for a special pair in RC of the recently discovered Acidiphilium rubrum were also examined for a comparison with P.

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Prolonging the lifetime of excited electrons of QDs by capping them with π-conjugated thiol ligands

Journal of Materials Chemistry C ◽

10.1039/c3tc32523g ◽

2014 ◽

Vol 2 (16) ◽

pp. 2939-2943 ◽

Cited By ~ 9

Author(s):

Jie Chang ◽

Hongbo Xia ◽

Suli Wu ◽

Shufen Zhang

Keyword(s):

Energy Levels ◽

Excited Electron ◽

Band Edge ◽

Lumo Energy ◽

Stable Environment ◽

Cdte Qds ◽

Thiol Ligands ◽

New Strategy

A new strategy is reported here to stabilize the excited electrons within QDs using-conjugated ligand. An electron delocalized field is formed by mixing the LUMO energy levels of π-conjugated ligand with conductive band-edge energy (Ecb) of CdTe QDs, which will supply the excited electron with a more stable environment.

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