报告题目 (Title)：金刚石与相关材料中的衍生量子现象(Emergent Quantum Phenomena in Diamond and Other Materials)

报告人 (Speaker)：张固非 教授（哈尔滨工业大学）

报告时间 (Time)：2025年1月8日（周三）14:30-16:00

报告地点 (Place)：校本部G601

邀请人(Inviter)：钟建新

主办部门：量子科技研究院/理学院物理系

报告摘要：

Recent decades have witnessed significant technological progress and economic growth. As the most prominent strategic pillar of modern society, microelectronics permeates almost the entire gamut of economic and social development activities. The present-day microelectronic devices based on traditional electronic materials and principles of classical physics, are rapidly approaching their limits. Hence, extensive research efforts are being devoted to the search for quantum phenomena in advanced electronic materials to fill the need for miniaturized low-dissipation devices based on new operation principles.

As a wide-bandgap semiconductor with some of the most extreme physical properties of any material, diamond has drawn wide attention for its potential applications in power electronics, optoelectronics, and electromechanics.1 Apart from its potential in upgrading traditional semiconductor industry, diamond also bears great promise for the development of quantum information technologies by being the host of a variety of quantum phenomena, e.g., spin states of color centers in diamond, and superconductivity in boron-doped diamond.2 In this talk, I will provide an overview of the quantum phenomena in superconducting diamond and devices. I will demonstrate how the nanogranular structure of this quantum material leads to the emergence of various quantum confinement and coherence effects.3-9 I will present our new findings of an unconventional giant ‘magnetoresistance’ in nanoscale ‘diamond rings’ which could be used as artificial atoms to advance the design of superconducting quantum devices.10 Moreover, I will show our findings of a series of exotic magnetoelectronic phenomena in ferromagnetic superconducting diamond, which expand the application scope of diamond from electronics to spintronics.11,12

In addition, the audience will be briefed on our investigations of phase-lip events in one-dimensional superconducting nanowires made of aluminum and iron pnictide, respectively, and the anomalous phase transition in a quasi-one-dimensional linear chain compound.13-15

1. P. May, Philos. Trans. R. Soc. A 358 (2000), 473.

2. E. Ekimov, et al. Nature 428 (2004), 542.

3. G. Zhang, et al. Phys. Rev. B 84 (2011), 214517.

4. G. Zhang, et al. Phys. Rev. Lett. 110 (2013), 077001.

5. G. Zhang, et al. Adv. Mater. 26 (2014), 2034.

6. G. Zhang, et al. Phys. Rev. Appl. 6 (2016), 064011.

7. G. Zhang, et al. ACS Nano 11 (2017), 11746.

8. G. Zhang, et al. Phys. Rev. Appl. 12 (2019), 064042.

9. G. Zhang, et al. Phys. Rev. Mater. 3 (2019), 034801.

10. G. Zhang, et al. Adv. Mater. (2023), 2211129.

11. G. Zhang, et al. ACS Nano 11 (2017), 5358.

12. G. Zhang, et al. Sci. Adv. 6 (2020), eaaz2536.

13. J. Li, et al. Nat. Commun. 6 (2015), 7614.

14. X. Baumans, et al. Nat. Commun. 7 (2016), 10560.

15. C. An, et al. Adv. Mater. 32 (2020), 2002352.