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arXiv 2110.01136cond-mat.str-elcond-mat.mes-hallcond-mat.supr-con
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调制掺杂莫特绝缘体Sn/Si(111)-($\sqrt{3}\times \sqrt{3}$)- R30 $^\textrm{o}$中赝能隙的实验观察

Experimental observation of pseudogap in a modulation-doped Mott insulator: Sn/Si(111)-($\sqrt{3}\times \sqrt{3}$)-R30$^\textrm{o}$

Yan-Ling Xiong, Jia-Qi Guan, Rui-Feng Wang, Can-Li Song, Xu-Cun Ma, Qi-Kun Xue

摘要:

在掺杂莫特绝缘体时,通常会出现不寻常的量子现象。利用低温扫描隧道显微镜结合分子束外延系统,研究了调制掺杂莫特绝缘体Sn/Si(111)-($\sqrt{3}\times \sqrt{3}$)-R30 $^\textrm{o}$的电子结构.在欠掺杂区,我们观察到一个普遍的赝能隙开放周围的费米能级,它的变化不大的磁场和Sn空位的出现。赝能隙在高温下被涂掉,并随着莫特绝缘相的空间限制而改变大小。我们的研究结果,以及先前观察到的超导性在较高的掺杂水平,是非常令人联想到的掺杂氧化铜化合物的电子相图。

英文摘要:

Unusual quantum phenomena usually emerge upon doping Mott insulators. Using a combinatorial molecular beam epitaxy system integrated with cryogenic scanning tunneling microscopy, we investigate the electronic structure of a modulation-doped Mott insulator Sn/Si(111)-($\sqrt{3}\times \sqrt{3}$)-R30$^\textrm{o}$. In underdoped regions, we observe a universal pseudogap opening around the Fermi level, which changes little with the applied magnetic field and the occurrence of Sn vacancies. The pseudogap gets smeared out at elevated temperatures and alters in size with the spatial confinement of the Mott insulating phase. Our findings, along with the previously observed superconductivity at a higher doping level, are highly reminiscent of the electronic phase diagram in the doped copper oxide compounds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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