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001019943 0247_ $$2doi$$a10.48550/ARXIV.2311.16590
001019943 0247_ $$2datacite_doi$$a10.34734/FZJ-2023-05764
001019943 037__ $$aFZJ-2023-05764
001019943 1001_ $$0P:(DE-Juel1)145420$$aWei, Xian-Kui$$b0$$eCorresponding author
001019943 245__ $$aAtomic diffusion-induced polarization and superconductivity in topological insulator-based heterostructures
001019943 260__ $$barXiv$$c2023
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001019943 520__ $$aThe proximity effect at a highly transparent interface of an s-wave superconductor (S) and a topological insulator (TI) provides a promising platform to create Majorana zero modes in artificially designed heterostructures. However, structural and chemical issues pertinent to such interfaces are poorly explored so far. Here, we report the discovery of Pd diffusion induced polarization at interfaces between superconductive Pd$_{1+x}$(Bi$_{0.4}$Te$_{0.6}$)$_2$ (xPBT, $0\le x \le 1$) and Pd-intercalated Bi$_2$Te$_3$ by using atomic-resolution scanning transmission electron microscopy. Our quantitative image analysis reveals that nanoscale lattice strain and QL polarity synergistically suppress and promote the Pd diffusion at the normal and parallel interfaces, formed between Te-Pd-Bi triple layers (TLs) and Te-Bi-Te-Bi-Te quintuple layers (QLs), respectively. Further, our first-principles calculations unveil that the superconductivity of xPBT phase and topological nature of Pd-intercalated Bi$_2$Te$_3$ phase are robust against the broken inversion symmetry. These findings point out the necessity of considering coexistence of electric polarization with superconductivity and topology in such S-TI systems.
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001019943 650_7 $$2Other$$aMaterials Science (cond-mat.mtrl-sci)
001019943 650_7 $$2Other$$aSuperconductivity (cond-mat.supr-con)
001019943 650_7 $$2Other$$aFOS: Physical sciences
001019943 7001_ $$0P:(DE-Juel1)171826$$aJalil, Abdur Rehman$$b1$$ufzj
001019943 7001_ $$0P:(DE-Juel1)157882$$aRüßmann, Philipp$$b2$$eCorresponding author$$ufzj
001019943 7001_ $$0P:(DE-HGF)0$$aAndo, Yoichi$$b3
001019943 7001_ $$0P:(DE-Juel1)125588$$aGrützmacher, Detlev$$b4$$ufzj
001019943 7001_ $$0P:(DE-Juel1)130548$$aBlügel, Stefan$$b5$$ufzj
001019943 7001_ $$0P:(DE-Juel1)130824$$aMayer, Joachim$$b6$$ufzj
001019943 773__ $$a10.48550/ARXIV.2311.16590
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