Towards the understanding of high-temperature superconductivity

and the enchancement of the transition temperature


We utilize atomically accurate thin film synthesis techniques to rationally design superconducting materials.

Together with in situ ARPES for electronic structures and multiple mesoscopic low-temperature characterizations, 

We aim to achieve higher transition temperatures and deeper understandings of the mechanism.

Highlights / 研究亮点

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Ultrastrong near-neighbor attraction in doped 1D cuprate chains

Is HTS pairing dominated by spin superexchange interactions? This is a central question. In 1D systems, we found an ultrastrong near-neighbor attraction in addition to the superexchange interaction [Science 373, 1235 (2021)]. Long-range electron-phonon coupling may give an explanation [PRL 127, 197003 (2021)].

| 2022-03-16

Quantitative measurement of interaction energy scales in nickelate superconductors

The comparative study of cuprates and nickelates may help understand unconventional superconductivity. We measured the energy density of states, U and Delta of nickelate superconductors. Experiments revealed that the key difference between nickelates and cuprates is the oxygen hybridization strength, which may be correlated to the huge superconducting temperature difference [Matter 5, 1806 (2022)].

| 2023-04-14

Systemaic doping-dependent ARPES measurements of La2-xSrxCuO4 thin films

We systematically measured the three-dimensional energy band structures and energy gaps of LSCO thin films in the doping range from 6% to 35% and found that the Lifshitz transition has little effect on the superconducting strength and symmetry, while the specific heat capacity calculated based on the energy band structures is consistent with the measured values without the contribution of the quantum critical point [PNAS 119, e2204630119 (2022)].

| 2023-04-15

2D Bose metal induced by superconducting phase fluctuations

In the phase diagrams of 2D superconductors, there is a Bose metal phase between the vortex liquid and superconductor regions. The resistivity is non-zero [Nat. Commun. 9, 4008 (2018), Nano Lett. 16, 6130 (2016) ], but particle-hole symmetry is maintained, indicating that the dominating carriers are still Cooper pairs. Bose metal also exhibits linear magnetoresistance: the derivative jump discontinuously at zero magnetic field, giving rise to a zero-field singularity [npj Quant. Mater. 15 (2021)]. The exotic transport phenomena of these Bose metals are independent of time-reversal symmetry.

| 2023-04-15
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News / 新闻

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Augmented model captures behavior in one-dimensional cuprates

Angle-resolved photoemission spectroscopy reveals stronger-than-predicted attraction between charges in an unconventional superconductor.

| 2021-09-20

降维解谜：高温超导新研究或摸到“象鼻子”

高温超导微观机理被视为凝聚态物理“皇冠上的明珠”，在过去30多年时间里涌现出诸多杰出研究工作，但迄今仍被专业人士认为处于盲人摸象阶段。今天，《赛先生》推荐刚刚发表的《科学》杂志论文作者陈卓昱、王耀撰写的科普文章，解读他们在高温超导微观机理取得的一项新突破，展示了研究背后的思路。这一工作被视为在现有理论模型上的一次重要改进，虽然尚未能摸得全象，但也许这次新突破摸到了象鼻子，令人期待。

| 2021-09-10

高温超导体理论模型缺一环？这次也许找到了

哈伯德模型加上这个电子间的强相互吸引力，或许可以成为解释铜氧化物超导体的完整理论模型。

| 2021-09-10

After 20 years of trying, scientists succeed in doping a 1D chain of cuprates

The scientists said it's likely that this strong nearest-neighbor attraction between electrons exists in all the cuprates and could help in understanding superconductivity in the 2D versions of the Hubbard model and its kin, giving scientists a more complete picture of these puzzling materials.

| 2021-09-09

新突破揭秘二维超导—量子金属相变的机理

第一次给出了二维超导—量子金属相变的在两个独立自由度上的相图，对二维超导体系具有普遍意义，并对二维量子金属的性质机理，以及界面超导的赝能隙做出了解释。

| 2018-10-08

Acknowledgements / 致谢