scholarly journals Polaron band formation in the Holstein model

1997 ◽  
Vol 56 (8) ◽  
pp. 4513-4517 ◽  
Author(s):  
G. Wellein ◽  
H. Fehske
Keyword(s):  
Band Formation ◽  
Holstein Model ◽  
Polaron Band

Analysis of Polaron Band Formation with the One-Dimensional Holstein Model

2005 ◽  
Vol 22 (8) ◽  
pp. 2023-2026
Author(s):  
Ge Ming ◽  
Qin Gan ◽  
Wan Shao-Long
Keyword(s):  
Band Formation ◽  
One Dimensional ◽  
Holstein Model ◽  
Polaron Band ◽  
The One

scholarly journals Boosting the Seebeck Coefficient for Organic Coordination Polymers: Role of Doping-Induced Polaron Band Formation

2019 ◽  
Vol 10 (10) ◽  
pp. 2493-2499 ◽  
Author(s):  
Yunpeng Liu ◽  
Wen Shi ◽  
Tianqi Zhao ◽  
Dong Wang ◽  
Zhigang Shuai
Keyword(s):  
Seebeck Coefficient ◽  
Coordination Polymers ◽  
Band Formation ◽  
Polaron Band

Optical Studies of Polyanilines: Effects of Alkyl Ring-Substitution and Solvent Environment

1989 ◽  
Vol 173 ◽  
Author(s):  
Anjan Ray ◽  
Alan G. MacDiarmid ◽  
John M. Ginder ◽  
Arthur J. Epstein
Keyword(s):  
Acetic Acid Solution ◽  
Exciton Absorption ◽  
Optical Studies ◽  
Band Formation ◽  
Near Ir ◽  
Alkyl Groups ◽  
Solvent Environment ◽  
Polaron Band ◽  
Uv Visible ◽  
Spectroscopy Optical

ABSTRACTMethyl and ethyl ring-substituted polyaniline derivatives have been synthesized and characterized by UV-visible-near IR spectroscopy. Optical spectra of the base forms in DMF solution suggest that the torsion angle between adjacent rings is increased by steric hindrance due to the alkyl groups in the substituted polymers, leading to blue shifts in the ∼4 eV (“bandgap”) and ∼2 eV (“exciton”) absorptions and an accompanying decrease in the relative intensity of the “exciton” band.The methyl ring-substituted derivative, poly(o-toluidine), is shown to exhibit solvatochromism. The “exciton” absorption shifts from 2.03 eV in pure NMP to 2.19 eV in CH2CI2, accompanied by a loss in intensity relative to the “exciton” absorption.The phenomenon is attributed to the presence of a more “rod-like” state in NMP as compared to a more “coil-like” state in CH2CI2.The effects of alkyl substituents on acetic acid solution spectra of “emeraldine” salt will be discussed with respect to polaron band formation in these systems.

Single-polaron band structure of the Holstein model

1996 ◽  
Vol 54 (13) ◽  
pp. 8981-8984 ◽  
Author(s):  
Walter Stephan
Keyword(s):  
Band Structure ◽  
Holstein Model ◽  
Polaron Band

Study of the one-dimensional Holstein model with next-nearest-neighbor hopping

2010 ◽  
Vol 23 (2) ◽  
pp. 025601 ◽  
Author(s):  
Monodeep Chakraborty ◽  
A N Das ◽  
Atisdipankar Chakrabarti
Keyword(s):  
Nearest Neighbor ◽  
One Dimensional ◽  
Holstein Model ◽  
The One

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.

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