What if We Could Electrically Tune Properties of Strongly Correlated Materials Just Like We Can With Semiconductors
Abstract
Our research funded by AFOSR under FA9550-16-1-0126 focused on fabrication of gate voltage-tunable superconducting weak links, using ionic liquid gating to modulate the very high carrier densities typically found in superconductors, too high to control with conventional gate electrodes. Three major thrusts were: 1) controlling superconductivity and tuning Josephson Junctions in diverse materials including high-Tc cuprates, and 2) fabrication of gate-tunable nanoscale ballistic junctions in SrTiO3, a superconductor that has much lower Tc (<1K) but is highly responsive to electrostatic and ionic liquid gating, and can have large electronic mean free path.1) Electrolyte gating of diverse superconductors and junctions: In collaboration with Shane Cybart (at UC Riverside), we demonstrated gate tunable high-Tc Josephson junctions. Superconducting weak links in optimally doped YBCO were written with He+ beam exposure. They showed high IcRn products up to 2.5 mV, indicative of high-quality barriers. The junction critical current was modulated in a reversible manner by the gate voltage applied across an ionic liquid, as shown in Fig. 1(a,b) [Stanwyck 2017].
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 2021
- Accession Number
- AD1126775
Entities
People
- David Goldhaber-Gordon