Tunable nonlocal valley-entangled Cooper pair splitter realized in bilayer-graphene van der Waals spin valves

2020 ◽  
Vol 101 (12) ◽  
Author(s):  
Xiuqiang Wu ◽  
Hao Meng ◽  
Fanjie Kong ◽  
Haiyang Zhang ◽  
Yujie Bai ◽  
...  
2015 ◽  
Vol 252 (11) ◽  
pp. 2395-2400 ◽  
Author(s):  
Marc Drögeler ◽  
Frank Volmer ◽  
Maik Wolter ◽  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
...  

2019 ◽  
Vol 18 (5) ◽  
pp. 448-453 ◽  
Author(s):  
Hyobin Yoo ◽  
Rebecca Engelke ◽  
Stephen Carr ◽  
Shiang Fang ◽  
Kuan Zhang ◽  
...  

Nano Letters ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 4303-4308 ◽  
Author(s):  
Zhe Wang ◽  
Deepak Sapkota ◽  
Takashi Taniguchi ◽  
Kenji Watanabe ◽  
David Mandrus ◽  
...  

2021 ◽  
Vol 118 (4) ◽  
pp. e2017366118 ◽  
Author(s):  
Alexander Kerelsky ◽  
Carmen Rubio-Verdú ◽  
Lede Xian ◽  
Dante M. Kennes ◽  
Dorri Halbertal ◽  
...  

Atomically thin van der Waals materials stacked with an interlayer twist have proven to be an excellent platform toward achieving gate-tunable correlated phenomena linked to the formation of flat electronic bands. In this work we demonstrate the formation of emergent correlated phases in multilayer rhombohedral graphene––a simple material that also exhibits a flat electronic band edge but without the need of having a moiré superlattice induced by twisted van der Waals layers. We show that two layers of bilayer graphene that are twisted by an arbitrary tiny angle host large (micrometer-scale) regions of uniform rhombohedral four-layer (ABCA) graphene that can be independently studied. Scanning tunneling spectroscopy reveals that ABCA graphene hosts an unprecedentedly sharp van Hove singularity of 3–5-meV half-width. We demonstrate that when this van Hove singularity straddles the Fermi level, a correlated many-body gap emerges with peak-to-peak value of 9.5 meV at charge neutrality. Mean-field theoretical calculations for model with short-ranged interactions indicate that two primary candidates for the appearance of this broken symmetry state are a charge-transfer excitonic insulator and a ferrimagnet. Finally, we show that ABCA graphene hosts surface topological helical edge states at natural interfaces with ABAB graphene which can be turned on and off with gate voltage, implying that small-angle twisted double-bilayer graphene is an ideal programmable topological quantum material.


Nano Today ◽  
2022 ◽  
Vol 42 ◽  
pp. 101373
Author(s):  
Xiangyu Zeng ◽  
Ge Ye ◽  
Shuyi Huang ◽  
Qikai Ye ◽  
Wei Li ◽  
...  

2017 ◽  
Vol 29 (42) ◽  
pp. 425303 ◽  
Author(s):  
H M Abdullah ◽  
B Van Duppen ◽  
M Zarenia ◽  
H Bahlouli ◽  
F M Peeters

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