Pressure-induced topological superconductivity in the spin–orbit Mott insulator GaTa4Se8
| Autor: | SungBin Lee, Archana Mishra, Moon Jip Park, Min Yong Jeong, GiBaik Sim, Myung Joon Han |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Josephson effect
02 engineering and technology Topology lcsh:Atomic physics. Constitution and properties of matter 01 natural sciences law.invention law Condensed Matter::Superconductivity 0103 physical sciences lcsh:TA401-492 010306 general physics Quantum tunnelling Superconductivity Physics Mott insulator 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials lcsh:QC170-197 Quasiparticle Condensed Matter::Strongly Correlated Electrons lcsh:Materials of engineering and construction. Mechanics of materials Scanning tunneling microscope Cooper pair 0210 nano-technology Random phase approximation |
| Zdroj: | npj Quantum Materials, Vol 5, Iss 1, Pp 1-6 (2020) |
| ISSN: | 2397-4648 |
| Popis: | Lacunar spinel GaTa4Se8 is a unique example of spin–orbit coupled Mott insulator described by molecular jeff = 3/2 states. It becomes superconducting at Tc = 5.8 K under pressure without doping. In this work, we show, this pressure-induced superconductivity is a realization of a new type topological phase characterized by spin-2 Cooper pairs. Starting from first-principles density functional calculations and random phase approximation, we construct the microscopic model and perform the detailed analysis. Applying pressure is found to trigger the virtual interband tunneling processes assisted by strong Hund coupling, thereby stabilizing a particular d-wave quintet channel. Furthermore, we show that its Bogoliubov quasiparticles and their surface states exhibit novel topological nature. To verify our theory, we propose unique experimental signatures that can be measured by Josephson junction transport and scanning tunneling microscope. Our findings open up new directions searching for exotic superconductivity in spin–orbit coupled materials. |
| Databáze: | OpenAIRE |
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