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Revealing the Thermal Properties of Superconducting Magic-Angle Twisted Bilayer Graphene
Nano Letters ( IF 9.6 ) Pub Date : 2022-08-02 , DOI: 10.1021/acs.nanolett.1c04512 Giorgio Di Battista 1 , Paul Seifert 1, 2 , Kenji Watanabe 3 , Takashi Taniguchi 4 , Kin Chung Fong 5 , Alessandro Principi 6 , Dmitri K Efetov 1
Nano Letters ( IF 9.6 ) Pub Date : 2022-08-02 , DOI: 10.1021/acs.nanolett.1c04512 Giorgio Di Battista 1 , Paul Seifert 1, 2 , Kenji Watanabe 3 , Takashi Taniguchi 4 , Kin Chung Fong 5 , Alessandro Principi 6 , Dmitri K Efetov 1
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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 ∼1011 cm–2 and electronic heat capacity (Ce) of <100kB. While these attributes position MATBG as a ground-breaking 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 (Ic) under continuous laser heating at 1550 nm. From the bolometric effect, we extract the temperature dependence of the electronic thermal conductance (Gth), which has a value of Gth = 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.
中文翻译：
揭示超导魔角扭曲双层石墨烯的热性能
据预测，魔角扭曲双层石墨烯 (MATBG) 的据称非常规超导相具有非凡的热性能，因为它是由高度稀释的电子集合形成的，载流子密度 ( n ) 约为10 11 cm – 2和电子热容量（Ce）<100 k B。虽然这些属性将 MATBG 定位为革命性量热应用的突破性材料平台，但这些特性迄今尚未通过实验证明。在这里，我们通过监测超导 MATBG 的温度相关临界电流 ( I c) 在 1550 nm 的连续激光加热下。从辐射热效应中，我们提取了电子热导 ( G th ) 的温度依赖性，其值G th = 0.2 pW/K 在 35 mK 并且在低温极限与幂律依赖性一致，如预计用于节点超导体。我们的工作为未来对该系统的热传输研究奠定了基础。
更新日期：2022-08-02
中文翻译：
揭示超导魔角扭曲双层石墨烯的热性能
据预测，魔角扭曲双层石墨烯 (MATBG) 的据称非常规超导相具有非凡的热性能，因为它是由高度稀释的电子集合形成的，载流子密度 ( n ) 约为10 11 cm – 2和电子热容量（Ce）<100 k B。虽然这些属性将 MATBG 定位为革命性量热应用的突破性材料平台，但这些特性迄今尚未通过实验证明。在这里，我们通过监测超导 MATBG 的温度相关临界电流 ( I c) 在 1550 nm 的连续激光加热下。从辐射热效应中，我们提取了电子热导 ( G th ) 的温度依赖性，其值G th = 0.2 pW/K 在 35 mK 并且在低温极限与幂律依赖性一致，如预计用于节点超导体。我们的工作为未来对该系统的热传输研究奠定了基础。
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