Electric field–tunable superconductivity in alternating-twist magic-angle trilayer graphene

doi:10.1126/science.abg0399

GSTDTAP > 气候变化

DOI	10.1126/science.abg0399
	Electric field–tunable superconductivity in alternating-twist magic-angle trilayer graphene
	Zeyu Hao; A. M. Zimmerman; Patrick Ledwith; Eslam Khalaf; Danial Haie Najafabadi; Kenji Watanabe; Takashi Taniguchi; Ashvin Vishwanath; Philip Kim
	2021-03-12
发表期刊	Science
出版年	2021
英文摘要	The discovery of superconductivity in bilayers consisting of graphene sheets twisted with respect to each other by just the right “magic” angle has inspired enormous interest in twisted materials. Hao et al. constructed twisted trilayer graphene, in which the middle layer is twisted with respect to the bottom layer and the top layer is roughly parallel to the bottom layer (see the Perspective by Yazdani). Such trilayers exhibited superconductivity that was tunable by an external electric field and consistent with having an unconventional nature. Science , this issue p. [1133][1]; see also p. [1098][2] Engineering moiré superlattices by twisting layers in van der Waals (vdW) heterostructures has uncovered a wide array of quantum phenomena. We constructed a vdW heterostructure that consists of three graphene layers stacked with alternating twist angles ±θ. At the average twist angle θ ~ 1.56°, a theoretically predicted “magic angle” for the formation of flat electron bands, we observed displacement field–tunable superconductivity with a maximum critical temperature of 2.1 kelvin. By tuning the doping level and displacement field, we found that superconducting regimes occur in conjunction with flavor polarization of moiré bands and are bounded by a van Hove singularity (vHS) at high displacement fields. Our findings display inconsistencies with a weak coupling description, suggesting that the observed moiré superconductivity has an unconventional nature. [1]: /lookup/doi/10.1126/science.abg0399 [2]: /lookup/doi/10.1126/science.abg5641
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/318691
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Zeyu Hao,A. M. Zimmerman,Patrick Ledwith,等. Electric field–tunable superconductivity in alternating-twist magic-angle trilayer graphene[J]. Science,2021.
APA	Zeyu Hao.,A. M. Zimmerman.,Patrick Ledwith.,Eslam Khalaf.,Danial Haie Najafabadi.,...&Philip Kim.(2021).Electric field–tunable superconductivity in alternating-twist magic-angle trilayer graphene.Science.
MLA	Zeyu Hao,et al."Electric field–tunable superconductivity in alternating-twist magic-angle trilayer graphene".Science (2021).