scholarly journals Correlated electron-hole state in twisted double-bilayer graphene

Science ◽  
2021 ◽  
Vol 373 (6560) ◽  
pp. 1257-1260
Author(s):  
Peter Rickhaus ◽  
Folkert K. de Vries ◽  
Jihang Zhu ◽  
Elías Portoles ◽  
Giulia Zheng ◽  
...  
Keyword(s):  
Bilayer Graphene ◽  
Hole State ◽  
Electron Hole ◽  
Correlated Electron

scholarly journals Spectroscopy of a tunable moiré system with a correlated and topological flat band

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiaomeng Liu ◽  
Cheng-Li Chiu ◽  
Jong Yeon Lee ◽  
Gelareh Farahi ◽  
Kenji Watanabe ◽  
...  
Keyword(s):  
Band Structure ◽  
Twist Angle ◽  
Bilayer Graphene ◽  
Scanning Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Flat Band ◽  
Correlated Electron ◽  
Partial Filling ◽  
Valley Polarization ◽  
Spectroscopic Signatures

AbstractMoiré superlattices created by the twisted stacking of two-dimensional crystals can host electronic bands with flat energy dispersion in which enhanced interactions promote correlated electron states. The twisted double bilayer graphene (TDBG), where two Bernal bilayer graphene are stacked with a twist angle, is such a moiré system with tunable flat bands. Here, we use gate-tuned scanning tunneling spectroscopy to directly demonstrate the tunability of the band structure of TDBG with an electric field and to show spectroscopic signatures of electronic correlations and topology for its flat band. Our spectroscopic experiments are in agreement with a continuum model of TDBG band structure and reveal signatures of a correlated insulator gap at partial filling of its isolated flat band. The topological properties of this flat band are probed with the application of a magnetic field, which leads to valley polarization and the splitting of Chern bands with a large effective g-factor.

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.

Effects of Doping on the Condensed Electron–Hole State in Germanium and Silicon

1974 ◽  
Vol 62 (2) ◽  
pp. 443-452 ◽  
Author(s):  
R. W. Martin ◽  
R. Sauer
Keyword(s):  
Hole State ◽  
Electron Hole

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

Recombination of correlated electron-hole pairs in two-dimensional semiconductors

1993 ◽  
Vol 48 (12) ◽  
pp. 9146-9149 ◽  
Author(s):  
Andreas Hangleiter
Keyword(s):  
Two Dimensional ◽  
Electron Hole ◽  
Correlated Electron

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 Propagation of Coulomb-Correlated Electron-Hole Pairs in Semiconductors with Correlated and Anticorrelated Disorder

2000 ◽  
Vol 218 (1) ◽  
pp. 125-132 ◽  
Author(s):  
P. Thomas ◽  
I. Varga ◽  
T. Lemm ◽  
J.E. Golub ◽  
K. Maschke ◽  
...  
Keyword(s):  
Electron Hole ◽  
Correlated Electron

scholarly journals Electron–hole collision limited transport in charge-neutral bilayer graphene

2017 ◽  
Vol 13 (12) ◽  
pp. 1207-1214 ◽  
Author(s):  
Youngwoo Nam ◽  
Dong-Keun Ki ◽  
David Soler-Delgado ◽  
Alberto F. Morpurgo
Keyword(s):  
Bilayer Graphene ◽  
Electron Hole

Spatial separation effect on the energies of uncorrelated and correlated electron-hole pair in CdSe/ZnS and InAs/InP core/shell spherical quantum dots

2017 ◽  
Vol 109 ◽  
pp. 123-133 ◽  
Author(s):  
A. Zouitine ◽  
A. Ibral ◽  
E. Assaid ◽  
F. Dujardin ◽  
E. Feddi
Keyword(s):  
Quantum Dots ◽  
Spatial Separation ◽  
Hole Pair ◽  
Core Shell ◽  
Electron Hole ◽  
Separation Effect ◽  
Correlated Electron ◽  
Electron Hole Pair
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