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Topic: Majorana zero mode for topological quantum computing

Speaker: Prof. Jinfeng JIA

Host: Prof. Xiangrong WANG

Date: Wednesday, March 18, 2026

Time: 10:30 AM - 11:45 AM

Venue: SIN Wai Kin International Conference Centre (W201), Administration Building

Language: English

Abstract: 

Topological superconductors attract lots of attentions recently, since they are predicted to host Majorana zero mode (MZM), which behaves like Majorana fermion and can be used in fault-tolerant quantum computation relying on their non-Abelian braiding statistics. Currently, most topological superconductors are engineered artificially based on a normal superconductor and the exotic properties of the electronic surface states of a topological insulator. As predicted, MZM in the vortex of topological superconductor appears as a zero energy mode with a cone like spatial distribution. Also, MZM can induce spin selective Andreev reflection (SSAR), a novel magnetic property which can be used to detect the MZMs.

In the artificial topological superconductor Bi2Te3/NbSe2 hetero-structure, all the three features have been observed for the MZMs inside the vortices and fully supported by theoretical analyses. More importantly, all evidences are self-consistent. Recently, the strong proximity effect was found in SnTe-Pb heterostructure. The bulk pairing gap and multiple in-gap states induced by topological surface states can be clearly distinguished. The superconductivity of SnTe is consistent with a new type of topological superconductors under the protection of lattice symmetries. Under lattice-symmetry protection, the superconducting SnTe is proven to possess multiple MZMs in a single vortex. This system provides a platform to study the coupling of multiple MZMs without the need of real space movement of a vortex.

Speaker Profile:

Jinfeng JIA is a chair professor of the school of physics and astronomy, Shang-hai Jiao Tong University/acting vice president of Southern University of Science and Technology. He graduated from Peking University in 1987. He received his Ph.D in condensed matter physics from the same university in 1992. From 1995 to 1996, he worked as a JSPS post-doc at Institute for Materials Research, Tohoku University, Japan. From 1996 to 2001, he worked as an associated professor at Department of Physics, Peking University. During the time, he worked as a visiting scientist in USA for 3 years. In 2001, he received the “100 Talents Project” of Chinese Academy of Sciences (CAS) and became a professor at Institute of Physics, CAS. From 2006 to 2009, he worked as a professor at Department of Physics, Tsinghua University. In 2009, he became a Cheung Kong Professor at Dept. of Physics, Shanghai Jiaotong University. In 2021, he was elected as an academician of CAS.

He is a condensed matter experimenter. His main research interests include topological superconductors and new quantum materials, quantum phenomenon in low-dimensional nano-structures, thin film growth by molecular beam epitaxy. He authored more than 330 SCI papers, including 7 in Science, 3 in Nature, 4 in Nature Phys., 3 in Nature Materials, 30 in Physical Review Letters, with a citation of more than 25000 times.