Rhodes Daniel A, Jindal Apoorv, Yuan Noah F Q, Jung Younghun, Antony Abhinandan, Wang Hua, Kim Bumho, Chiu Yu-Che, Taniguchi Takashi, Watanabe Kenji, Barmak Katayun, Balicas Luis, Dean Cory R, Qian Xiaofeng, Fu Liang, Pasupathy Abhay N, Hone James
Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States.
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.
Nano Lett. 2021 Mar 24;21(6):2505-2511. doi: 10.1021/acs.nanolett.0c04935. Epub 2021 Mar 9.
Crystalline two-dimensional (2D) superconductors (SCs) with low carrier density are an exciting new class of materials in which electrostatic gating can tune superconductivity, electronic interactions play a prominent role, and electrical transport properties may directly reflect the topology of the Fermi surface. Here, we report the dramatic enhancement of superconductivity with decreasing thickness in semimetallic -MoTe, with critical temperature () increasing up to 7.6 K for monolayers, a 60-fold increase with respect to the bulk . We show that monolayers possess a similar electronic structure and density of states (DOS) as the bulk, implying that electronic interactions play a strong role in the enhanced superconductivity. Reflecting the low carrier density, the critical temperature, magnetic field, and current density are all tunable by an applied gate voltage. The response to high in-plane magnetic fields is distinct from that of other 2D SCs and reflects the canted spin texture of the electron pockets.
具有低载流子密度的晶体二维（2D）超导体（SCs）是一类令人兴奋的新型材料，其中静电门控可调节超导性，电子相互作用起着重要作用，并且电输运性质可能直接反映费米面的拓扑结构。在此，我们报道了半金属性碲化钼（-MoTe）中随着厚度减小超导性的显著增强，单层的临界温度（）高达7.6 K，相对于块体增加了60倍。我们表明，单层具有与块体相似的电子结构和态密度（DOS），这意味着电子相互作用在增强的超导性中起着重要作用。反映出低载流子密度，临界温度、磁场和电流密度均可通过施加的栅极电压进行调节。对高面内磁场的响应与其他二维超导体不同，反映了电子口袋的倾斜自旋纹理。
