scholarly journals Many-body effects in twisted bilayer graphene at low twist angles

2019 ◽  
Vol 100 (4) ◽  
Author(s):  
A. O. Sboychakov ◽  
A. V. Rozhkov ◽  
A. L. Rakhmanov ◽  
Franco Nori
Keyword(s):  
Bilayer Graphene ◽  
Many Body ◽  
Twisted Bilayer Graphene ◽  
Many Body Effects

scholarly journals Orbital-specific Tunability of Many-Body Effects in Bilayer Graphene by Gate Bias and Metal Contact

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Hirokazu Fukidome ◽  
Masato Kotsugi ◽  
Kosuke Nagashio ◽  
Ryo Sato ◽  
Takuo Ohkochi ◽  
...  
Keyword(s):  
Bilayer Graphene ◽  
Metal Contact ◽  
Gate Bias ◽  
Many Body ◽  
Many Body Effects

scholarly journals Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene

Nature ◽  
2019 ◽  
Vol 572 (7767) ◽  
pp. 101-105 ◽  
Author(s):  
Yonglong Xie ◽  
Biao Lian ◽  
Berthold Jäck ◽  
Xiaomeng Liu ◽  
Cheng-Li Chiu ◽  
...  
Keyword(s):  
Bilayer Graphene ◽  
Magic Angle ◽  
Many Body ◽  
Twisted Bilayer Graphene ◽  
Spectroscopic Signatures

scholarly journals Does filling-dependent band renormalization aid pairing in twisted bilayer graphene?

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Cyprian Lewandowski ◽  
Stevan Nadj-Perge ◽  
Debanjan Chowdhury
Keyword(s):  
Density Of States ◽  
Bilayer Graphene ◽  
Spatial Extent ◽  
Magic Angle ◽  
Many Body ◽  
Wannier Functions ◽  
Electron Phonon Coupling ◽  
Wide Range ◽  
Twisted Bilayer Graphene ◽  
Superconducting Pairing

AbstractMagic-angle twisted bilayer graphene (MATBG) exhibits a panoply of many-body phenomena that are intimately tied to the appearance of narrow and well-isolated electronic bands. The microscopic ingredients that are responsible for the complex experimental phenomenology include electron–electron (phonon) interactions and nontrivial Bloch wavefunctions associated with the narrow bands. Inspired by recent experiments, we focus on two independent quantities that are considerably modified by Coulomb interaction-driven band renormalization, namely the density of states and the minimal spatial extent associated with the Wannier functions. First, we show that a filling-dependent enhancement of the density of states, caused by band flattening, in combination with phonon-mediated attraction due to electron-phonon umklapp processes, increases the tendency towards superconducting pairing in a range of angles around magic-angle. Second, we demonstrate that the minimal spatial extent associated with the Wannier functions, which contributes towards increasing the superconducting phase stiffness, also develops a nontrivial enhancement due to the interaction-induced renormalization of the Bloch wavefunctions. While our modeling of superconductivity (SC) assumes a weak electron-phonon coupling and does not consider many of the likely relevant correlation effects, it explains simply the experimentally observed robustness of SC in the wide range of angles that occurs in the relevant range of fillings.

Gain characteristics of GaN quantum wells including many body effects

1995 ◽  
Vol 31 (14) ◽  
pp. 1149 ◽  
Author(s):  
P. Rees ◽  
C. Cooper ◽  
P. Blood ◽  
P.M. Smowton ◽  
J. Hegarty
Keyword(s):  
Quantum Wells ◽  
Many Body ◽  
Many Body Effects

scholarly journals Correlation-Induced Insulating Topological Phases at Charge Neutrality in Twisted Bilayer Graphene

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yuan Da Liao ◽  
Jian Kang ◽  
Clara N. Breiø ◽  
Xiao Yan Xu ◽  
Han-Qing Wu ◽  
...  
Keyword(s):  
Bilayer Graphene ◽  
Topological Phases ◽  
Charge Neutrality ◽  
Twisted Bilayer Graphene
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