High temperature superconductor-based quantum devices are promising candidates for future quantum computing and other applications and thus attract great interests. One example is superconducting qubits based on the Josephson junctions (JJ) consisting of two superconductors coupled by a weak link, which may be a thin insulating, a non-superconducting metal, or a different superconductor, in S-I-N, S-N-S or S-s-S junctions respectively. More specifically the work will target the integration of high temperature superconductors with Si-based other substrates for new Joseph Junction designs. A unique and novel trilayer stack will be implemented for the proposed Josephson junction and device layout design for integration and scale-up. Such critical steps in materials integration of new superconductors on IC-based as well as flexible substrates could enable fascinating system integration of superconductor-based quantum computing devices with CMOS-based logic devices and open new hybrid computer schemes for next generation supercomputers. Another aspect of the project is to use JJ based qubits as well as spintronics based devices as novel experimental probes to better understand the physics underlying the high temperature superconductors.
Promising candidates shall have Ph.D. in materials science and physics with solid research background in thin film growth, superconductivity, high temperature superconductor processing and characterizations, low temperature measurements, device processing and characterizations. The successful candidate will be jointly supervised by both advisors and learn the growth and characterization of high Tc superconductor and other thin films (Wang lab) and fabrication and measurement of JJ and spintronic devices (Chen lab).
Yong P. Chen (ECE, Physics)
1. Jijie Huang, Li Chen, Leigang Li, Xinghang Zhang, Haiyan Wang. Superconducting FeSe0.1Te0.9 thin films on Si-based substrates. Journal of Physics D. Applied Physics, 51 (2018) 205301. DOI: 10.1088/1361-6463/aabc70.
2. Huang, J. J., Chen, L., Jian, J., Tyler, K., Li, L. G., Wang, H. & Wang, H. Y. Magnetic (CoFe2O4)(0.1)(CeO2)(0.9) nanocomposite as effective pinning centers in FeSe0.1Te0.9 thin films. Journal of Physics-Condensed Matter 28, 7, DOI:10.1088/0953-8984/28/2/025702 (2016).
3. Jijie Huang, Li Chen, Jie Jian, Leigang Li, Han Wang and Haiyan Wang , Magnetic (CoFe2O4)0.1(CeO2)0.9 nanocomposite as effective pinning centers in FeSe0.1Te0.9 thin films, Journal of Phys. Condensed Matters, 28, 2, 2015.
4. Jijie Huang, Li Chen, Jie Jian, Fauzia Khatkhatay, Clement Jacob and Haiyan Wang, A much simplified coated conductor design using FeSexTe1-x thin films on cost-effective designed metal substrates, Journal of Alloys and Compounds, 647,380–385, 2015. DOI: 10.1016/j.jallcom.2015.06.109.
5. Jijie Huang , Li Chen. Jie Jian, Fauzia Khatkhatay , Haiyan Wang Nanostructured pinning centers in FeSe0.1Te0.9 thin films for enhanced superconducting properties Superconductor Science and Technology (Impact Factor: 2.76). 09/2014; 27(10):105006. DOI: 10.1088/0953-2048/27/10/105006.
6. Yuanyuan Zhu, Li Chen, Jim Ciston and Haiyan Wang, Atomic-Scale Investigations of Intrinsic Chemical Inhomogeneity in Superconducting Fe1.10Te0.45Se0.55 Epitaxial Films, Journal of Physical Chemistry C, 117, 7170-7177, 2013.
7. Li Chen, Jijie Huang, Chen-Fong Tsai, Yuanyuan Zhu, Jie Jian, Aiping Chen, Zhenxing Bi, Fauzia Khatkhatay, Nicholas Cornell, Anvar Zakhidov, Haiyan Wang, Superconducting Properties of FeSexTe1-x Thin Film with a Composition Close to Antiferromagnetic Ordering, Superconductor Science and Technologies, 26, 112001, 2013.
8. Morteza Kayyalha, Mehdi Kargarian, Aleksandr Kazakov, Ireneusz Miotkowski, Victor M. Galitski, Victor M. Yakovenko, Leonid P. Rokhinson, Yong P. Chen, "Anomalous low-temperature enhancement of supercurrent in topological-insulator nanoribbon Josephson junctions: evidence for low-energy Andreev bound states", arxiv:1712.02748
9. Luis A. Jauregui, Morteza Kayyalha, Aleksander Kazakov, Ireneusz Miotkowski, Leonid P. Rokhinson, Yong P. Chen, "Gate-tunable supercurrent and multiple Andreev reflections in a superconductor-topological insulator nanoribbon-superconductor hybrid device", Applied Physics Letters 112, 093105 (2018)
10. Jifa Tian, Seokmin Hong, Ireneusz Miotkowski, Supriyo Datta, Yong P. Chen, "Observation of current-induced, long-lived persistent spin polarization in a topological insulator: a rechargeable spin battery", Science Advances 3, e1602531 (2017)
11. Jifa Tian, Ireneusz Miotkowski, Seokmin Hong, Yong P. Chen, "Electrical injection and detection of spin-polarized currents in topological insulator Bi2Te2Se", Scientific Reports 5, 14293 (2015)