Electronic and magnetic responses in topological semimetals
Microstructured Quantum Matter Seminar
- Datum: 17.11.2022
- Uhrzeit: 14:00 - 15:00
- Vortragende: Sukriti Singh
- Max Planck Institute for Chemical Physics of Solids, Dresden
- Ort: CFEL (Bldg. 99)
- Raum: Seminar Room II, EG.078
- Gastgeber: Carsten Putzke
Condensed matter research in general and material science in particular are driven by the hunt for novel materials with potential applications. There is a huge category of materials known and investigated earlier, but their many physical phenomena were not understood clearly. After the introduction of the concept of topology in the field of material science, many phenomena were understood and thus they need to be studied to create a better understanding. While for some phenomena, the researchers developed a better understanding, some were overlooked in topological materials. I will be discussing my projects which include the detailed investigation of electronic and magnetic responses in magnetic and non-magnetic topological semimetals.
1. ZrMnP and HfMnP, Here, we investigated electro-magnetic transports of two ferromagnetic compounds, such as ZrMnP and HfMnP. The abundance of mirror planes in the crystal structure ensures gapped nodal lines at the Fermi energy. Our first principle calculations revealed that these materials are possessing nodal lines near Fermi energy which is gapped after the introduction of spinorbit coupling resulting in one of the largest anomalous Hall conductivities in the family of nodal lines. (Adv. Mater. 2021, 33, 2104126)
2. NiMnSb and PtMnSb: Here, we investigated well-known half Heusler compounds NiMnSb in terms of their non-trivial topology and found that there are accidental Weyl nodes. Moreover, we also realized that Weyl nodes that are far from Fermi level drag the Berry Curvature to the Fermi level resulting in Berry curvature induced anomalous Hall conductivity.
3. ZrTe5 and HfTe5: Here, we investigated magnetic response of non-magnetic topological semimetals. And, it was quite interesting to realize that how magnetization can be used as tool to characterize the nodal crossing. And apart from that ZrTe5 and HfTe5, which are categorized as massive Dirac semimetals shows largest diamagnetic values in the state-of-the-art previously reported topological semimetals. (J. Phys.: Condens. Matter. 2022, 34, 225802)
Sukriti received her Master’s degree from the Indian Institute of Technology. She is currently finishing her PhD-Thesis at the MPI-CPfS in the Group of Prof. Claudia Felser in collaboration with Prof. Hans-Henning Klaus from the TU Dresden.