Powered by Indico
v3.2.3
Host: Prof. Vadim Grinenko
Venue: TDLI Meeting Room N400
Tencent Meeting link: https://meeting.tencent.com/dm/OCtYQ3UcwQ0k Meeting ID: 780485134, no password
Abstract:
The emergence of superconductivity in two-dimensional transition metal dichalcogenides with strong spin orbit coupling (SOC) has opened new avenues for exploring exotic superconducting states, such as the Ising-type and Rashba-type superconductivities. Here, we report experimental observation of an anisotropic Fulde-Ferrell (FF) phase in few-layer NbSe2/CrSiTe3 heterostructures under in-plane magnetic fields. Through combined magnetoresistance and nonreciprocal transport measurements, we find that due to the couplings from the ferromagnetic CrSiTe3, a half-dome-shaped region emerges in the magnetic field-temperature (B-T) diagram. Importantly, the half-dome shaped region exhibits finite second harmonic resistance with in-plane anisotropy, indicating that the superconducting state is an anisotropic FF phase. Through a symmetry analysis combined with mean field calculations, we attribute the emergent anisotropic FF phase to the CrSiTe3 layer induced Rashba SOC and three-fold rotational symmetry breaking. These results demonstrate that 1 heterostructure stacking is a powerful tool for symmetry engineering in super conductors, which can advance the design of quantum devices in atomically thin superconducting materials.
Biography:
Prof. Jun Li received his Ph.D. degree from Hokkaido University in Japan in 2012. He subsequently conducted postdoctoral research at the National Institute for Materials Science in Japan and KU Leuven in Belgium. In 2014, he joined the School of Electronic Science and Engineering at Nanjing University as an associate professor. At the end of 2018, he joined ShanghaiTech University. His research has consistently focused on the fabrication and properties of low-dimensional superconducting devices.