Scanning Tunneling Microscopy studies on non-symmorphic compound GdSbTe
Balaji Venkatesan1,2,3,4*, Chih-Chuan Su1, Kunchala Ramesh Babu2, Raman Sankar1,5, Fang-Cheng Chou5, Guang-Yu Guo2,3,4, Chia-Seng Chang1,2,3,4, Tien-Ming Chuang1,3,4
1Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
2Department of Physics, National Taiwan University, Taipei 10617, Taiwan
3Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan
4National Taiwan University, Taipei 10617, Taiwan
5Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
* Presenter:Balaji Venkatesan,
Magnetic ordering in topological semimetals allow the tunability between different electronic states, such as Dirac, Weyl and other states with exotic degeneracies. In ZrSiS, 3D Dirac nodal lines are protected by non-symmorphic crystalline symmetry. Furthermore, there exist more than 200 iso-structural compounds with different physical properties, including magnetism and superconductivity. GdSbTe exhibits antiferromagnetism and a complex magnetic phase diagram below NĂ©el temperature (TN=13K), making it easier to study the coupling between the Dirac and magnetic states. Photoemission spectroscopy studies suggest that GdSbTe has robust Dirac states that are unaffected across magnetic phase transition. Here, we have conducted detail study on GdSbTe by using a low temperature scanning tunneling microscope and the analysis based on our density functional theory calculations. We will present our results of imaging quasiparticle scattering interference across the magnetic transition temperature and in the application of external magnetic field up to 7 Tesla.

Keywords: Topological Semimetals, Dirac Semimetals, antiferromagnetic ordering, scanning tunneling microscopy