Optical conductivities in triple fermions with different monopole charges

2021 ◽  
Author(s):  
G. Chen ◽  
C. M. Wang
Keyword(s):  
Lattice Models ◽  
Low Energy ◽  
Flat Band ◽  
Strong Anisotropy ◽  
Characteristic Frequencies ◽  
Conduction Electrons ◽  
Energy Models ◽  
Sign Change ◽  
Linear Optical ◽  
The One

Abstract We investigate the linear optical conductivities of the newly-discovered triple-component semimetals. Due to the exactly flat band, the optical conductivity relates to the transition between the zero band and the conduction band directly reflecting the band structure of the conduction electrons in contrast to the other materials. For the low-energy models with various monopole charges, the diagonal conductivities show strong anisotropy. The ω-dependence of interband conductivities for a general low-energy model is deduced. The real part of the interband σ_xx always linearly depends on the optical frequency, while the one of σ_zz is proportional to ω^{2/n-1}. This can be a unique fingerprint of the monopole charge. For the lattice models, there also exists the optical anomalous Hall conductivity, where a sign change may appear. The characteristic frequencies of the kink structures are calculated, strictly. Our work will help us to establish the basic picture of linear optical response in topological triple-component semimetals and identify them from other materials.

scholarly journals Complex magnetism of the two-dimensional antiferromagnetic Ge2F: from a Néel spin-texture to a potential antiferromagnetic skyrmion

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8654-8663
Author(s):  
Fatima Zahra Ramadan ◽  
Flaviano José dos Santos ◽  
Lalla Btissam Drissi ◽  
Samir Lounis
Keyword(s):  
Density Functional Theory ◽  
Magnetic Properties ◽  
Density Functional ◽  
Low Energy ◽  
Two Dimensional ◽  
Functional Theory ◽  
2D Material ◽  
Energy Models ◽  
Spin Texture

Based on density functional theory combined with low-energy models, we explore the magnetic properties of a hybrid atomic-thick two-dimensional (2D) material made of germanene doped with fluorine atoms in a half-fluorinated configuration (Ge2F).

scholarly journals Competition between the Soft Gap and the Molecular Kondo Singlets in Flat-band Lattices

2018 ◽  
Vol 28 (4) ◽  
pp. 361 ◽  
Author(s):  
Bo Duong Nguyen ◽  
Son Hong Nguyen ◽  
Tien Minh Tran
Keyword(s):  
Renormalization Group ◽  
Strong Coupling ◽  
Kondo Effect ◽  
Magnetic Impurity ◽  
Local Moment ◽  
Flat Band ◽  
Numerical Renormalization Group ◽  
Kondo Problem ◽  
Conduction Electrons ◽  
Lieb Lattice

The Kondo problem of a magnetic impurity embedded in the Lieb lattice is studied by the numerical renormalization group. The magnetic impurity hybridizes with conduction electrons from both the flat- and the soft-gap bands. We find a competition between the soft gap and the molecular Kondo singlet formations. The molecular Kondo effect occurs only when the magnetic impurity strongly hybridizes with conduction electrons at edge center sites of the Lieb lattice, and at the temperature range between the artificial strong coupling and the local moment regimes.

LOW ENERGY EFFECTIVE LAGRANGIAN FOR SUPERSYMMETRIC SEESAW MODEL

2007 ◽  
Vol 16 (05) ◽  
pp. 1437-1443
Author(s):  
AKINA KATO ◽  
TAKUYA MOROZUMI ◽  
NORIMI YOKOZAKI ◽  
SYN KYU KANG
Keyword(s):  
Neutrino Mass ◽  
Higgs Mass ◽  
Higgs Sector ◽  
Low Energy ◽  
Seesaw Model ◽  
Mass Correction ◽  
Effective Lagrangian ◽  
The One ◽  
The Right ◽  
Higgs Fields

Seesaw model is an attractive model because it may explain baryogenesis through leptogenesis and also may explain the small neutrino mass. The supersymmetric seesaw model may be more attractive because the naturalness problem is absent in supersymmetric theory. Recently, the higgs mass correction due to leptons and sleptons loops is computed.1 In this talk, we report on the preliminary results on the one loop corrections of leptons and sleptons loops to the effective action of Higgs sector for super symmetric seesaw model. Our results show that the corrections to the mass parameters for Higgs sector are proportional to the soft breaking parameters of supersymmetric seesaw model, while for the quartic couplings of Higgs fields, the corrections are suppressed by inverse powers of the right-handed neutrino mass.

Distinguishability of superstringE6-inspired low-energy models andSU(5)ccolor model

1993 ◽  
Vol 47 (9) ◽  
pp. 3768-3774
Author(s):  
Saswati Sarkar ◽  
Krishnanath Bandyopadhyay ◽  
Asim K. Ray ◽  
Utpal Sarkar
Keyword(s):  
Low Energy ◽  
Energy Models

Efficient Iron Removal to Produce High Purity Quartz Sand by Micro-Inclusion Bursting Using Microwave Pretreatment Combined with Different Acid

2020 ◽  
Vol 1001 ◽  
pp. 28-34
Author(s):  
Fei Fei Li ◽  
Xue Song Jiang ◽  
Jing Wei Li ◽  
Bo Yuan Ban ◽  
Jian Chen
Keyword(s):  
Acid Leaching ◽  
Microwave Treatment ◽  
Phase Changes ◽  
Low Energy ◽  
Local Phase ◽  
Selective Heating ◽  
Low Energy Consumption ◽  
Fast Processing ◽  
The One ◽  
Optimized Conditions

The one of major impurities in quartz is iron, which has a great impact on the properties of the material and should be be strictly removed in many applications. In this study, a low-energy consumption, simple, fast processing is introduced by combination microwave treatment with different acid leaching. Selective heating of microwaves is used to process quartz, causing local phase changes to improve the purification effect. Acid leaching was used to remove the iron in the quartz matrix. Under optimized conditions, the iron content can be reduced to below 0.167 ppmw with one single purification pass.

scholarly journals Low energy supergravity revisited (I)

2019 ◽  
Vol 34 (01) ◽  
pp. 1950004
Author(s):  
Gilbert Moultaka ◽  
Michel Rausch de Traubenberg ◽  
Damien Tant
Keyword(s):  
Model Building ◽  
Vacuum Expectation ◽  
Complete Classification ◽  
Low Energy ◽  
Rigorous Approach ◽  
Hidden Sector ◽  
New Type ◽  
The One ◽  
The Masses ◽  
Chiral Superfields

General forms of the Kähler and superpotenials that lead to consistent low energy broken Supersymmetry originating from N[Formula: see text]=[Formula: see text]1 Supergravity have been classified and used for model building since more than three decades. We point out the incompleteness of this classification when hidden sector vacuum expectation values are of the order of the Planck mass. Focusing in this paper mainly on the case of minimal Kähler potential, we adopt a rigorous approach that retrieves on the one hand the known forms, and demonstrate on the other hand the existence of a whole set of new forms for the superpotential of which we give a complete classification. The latter forms involve a new type of chiral superfields having the unusual property of belonging neither to the hidden sector nor to the conventional observable sector. Comparing the obtained forms with the conventional ones, we argue how new possibilities for model building can arise, and discuss the gravity mediation of soft as well as additional hard (but parametrically small) Supersymmetry breaking, in the presence of the new type of chiral superfields. In the simplest case, we study the vacuum structure, characterize the masses and couplings of the scalar components to the hidden and observable sectors and discuss briefly the physical role they could play. In the generic case, we estimate the magnitude and possible consequences of the hard breaking of Supersymmetry in terms of the interplay between hidden and visible sector mass scales.

PRELIMINARY MEASUREMENTS OF THE LOW ENERGY DETECTION EFFICIENCY OF A Si(Li) DETECTOR FOR PIXE APPLICATIONS

2002 ◽  
Vol 12 (03n04) ◽  
pp. 71-78
Author(s):  
M. RODRIGUEZ ◽  
T. YONEZAWA ◽  
K. ISHII ◽  
S. MATSUYAMA ◽  
H. YAMAZAKI ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Energy Detection ◽  
Thick Target ◽  
Incident Electron ◽  
Thin Layers ◽  
Low Energy ◽  
Dead Layer ◽  
Bremsstrahlung Spectrum ◽  
Significant Discrepancy ◽  
The One

The low energy detection efficiency of a Si ( Li ) detector is measured in this work. The continuous bremsstrahlung spectrum produced by bombarding a thick C target with an electron beam is used as the standard radiation source. The bremsstrahlung spectrum for a thick C target is calculated from tabulated data assuming the thick target to consist of an array of thin layers applying the respective attenuation correction for photons emitted in each thin layer. The bremsstrahlung spectra for three incident electron energies (10, 12 and 15 keV) are measured and compared with the calculated ones. The relative efficiency is obtained and compared with a calculated efficiency based on the detector specifications. The efficiency measured for those three incident electron energies on the thick target are consistent with each other. The region limited by 2 keV < k < 6 keV , where k is the X-ray energy, exhibits a significant discrepancy between measurements and calculated efficiencies. A possible explanation of the observed discrepancy is that the real thickness of the Si dead layer is thinner than the one reported by the manufacturer. The obtained efficiency values are valid within the range 0.8 keV < k < 12.5 keV .

scholarly journals One-loop effective scalar-tensor gravity

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Boris Latosh
Keyword(s):  
Gravitational Waves ◽  
Minimal Model ◽  
Low Energy ◽  
Gravity Models ◽  
Loop Level ◽  
The One

AbstractNon-minimal interactions are proven to be generated at the one-loop level in simple scalar-tensor gravity models. The John interaction from the Fab Four class is generated. The interaction affects the speed of gravitational waves in the contemporary Universe. Its role in low-energy phenomenology is discussed. Brans-Dicke-like interaction is generated in a non-minimal model. An opportunity to generate a dynamic low-energy Newton constant is addressed.

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