July 15, 2026
van der Waals Heterostructures
Layered systems such as MnBi2Te4/Cr2Ge2Te6 and Td-MoTe2 provide tunable interfaces for engineering magnetic exchange, inversion asymmetry, and interfacial superconducting transport.
Research Topic: Topological Materials
January 17, 2026
Unconventional hysteresis due to time-reversal symmetry breaking superconductivity in RbV3Sb5
The study of kagome materials has recently attracted much attention due to the presence of many electron-electron interaction-driven phases in a single material. In this work, we report time-reversal symmetry-breaking superconductivity in the thin-flake kagome material RbV3Sb5. Firstly, when an in-plane magnetic field is swept in opposite directions, we observe an unconventional form of hysteresis in magnetoresistance, which is different from the hysteresis induced by extrinsic mechanisms. In contrast, no such hysteresis is observed in CsV3Sb5 samples below their superconducting transition temperature. Strikingly, at a fixed magnetic field, the finite-resistance state in RbV3Sb5 can be transitioned into the superconducting state by applying and subsequently removing a large current. Secondly, at temperatures around 400 mK, the re-entrance of superconductivity occurs during an in-plane field-sweeping process with a fixed sweeping direction. The observations of the unconventional hysteresis and re-entrance suggest the existence of time-reversal symmetry-breaking superconducting states in RbV3Sb5.
September 15, 2025
Tunable Anomalous Hall Effect in Non-Magnetic Topological Semimetal Cd3As2 Nanoplates
The emergence of topology has profoundly transformed condensed matter physics, driving the discovery of topological materials, including topological semimetals. Here, we report the observation of gate-tunable anomalous Hall effect (AHE) in the non-magnetic Dirac semimetal Cd3As2. The anomalous Hall conductivity reaches the maximum when the gate voltage is near the Dirac point. Fitting the anomalous Hall resistivity using the scaling relationship of AHE reveals that the AHE in Cd3As2 is dominated by the intrinsic contribution of Berry curvature. Our results are valuable for understanding AHE in topological semimetals and could have possible potential applications in topological devices.
January 16, 2025
Pseudo-spin-polarized topological superconductivity in kagome RbV3Sb5
Kagome superconductors AV3Sb5 (A = K, Rb, Cs) have sparked considerable interest due to the presence of several intertwined symmetry-breaking phases within a single material. Interestingly, in a recent experiment, magnetic hysteresis was observed in the superconducting state through magnetoresistance measurements in RbV3Sb5 (Nature Communications 17, 1310, 2026), providing strong evidence of a spontaneous time-reversal symmetry-breaking superconducting state. The magnetic hysteresis, combined with crystalline symmetry, imposes strong constraints on the possible pairing symmetries of the superconducting state. In this work, we propose that RbV3Sb5 is a nodal topological superconductor with pseudo-spin-polarized Cooper pairs. The pseudo-spin-polarized superconducting domains resemble the properties of ferromagnetic domains and induce hysteresis. Moreover, the nodal topological superconducting state possesses Majorana flat-band modes at the sample boundary, which can be detected by tunneling experiments.