• 文献标题:   Revealing the Thermal Properties of Superconducting Magic-Angle Twisted Bilayer Graphene
  • 文献类型:   Article, Early Access
  • 作  者:   DI BATTISTA G, SEIFERT P, WATANABE K, TANIGUCHI T, FONG KC, PRINCIPI A, EFETOV DK
  • 作者关键词:   magicangle twisted bilayer graphene, moire material, thermal conductivity, superconductivity
  • 出版物名称:   NANO LETTERS
  • ISSN:   1530-6984 EI 1530-6992
  • 通讯作者地址:  
  • 被引频次:   6
  • DOI:   10.1021/acs.nanolett.1c04512 EA AUG 2022
  • 出版年:   2022

▎ 摘  要

The allegedly unconventional superconducting phase of magic-angle twisted bilayer graphene (MATBG) has been predicted to possess extraordinary thermal properties, as it is formed from a highly diluted electron ensemble with a record-low carrier density (n) of similar to 10(11) cm(-2) and electronic heat capacity (C-e) of <100k(B). While these attributes position MATBG as a groundbreaking material platform for revolutionary calorimetric applications, these properties have so far not been experimentally shown. Here, we reveal the thermal properties of superconducting MATBG by monitoring its temperature dependent critical current (I-c) under continuous laser heating at 1550 nm. From the bolometric effect, we extract the temperature dependence of the electronic thermal conductance (G(th)), which has a value of G(th) = 0.2 pW/K at 35 mK and in the low temperature limit is consistent with a power law dependence, as expected for nodal superconductors. Our work lays the foundation for future thermal transport studies on this system.