Systematics of molecular self-assembled networks at topological insulators surfaces

Nano Letters
T BathonMatthias Bode

Abstract

The success of topological insulators (TI) in creating devices with unique functionalities is directly connected to the ability of coupling their helical spin states to well-defined perturbations. However, up to now, TI-based heterostructures always resulted in very disordered interfaces, characterized by strong mesoscopic fluctuations of the chemical potential that make the spin-momentum locking ill-defined over length scales of few nanometers or even completely destroy topological states. These limitations call for the ability to control topological interfaces with atomic precision. Here, we demonstrate that molecular self-assembly processes driven by inherent interactions among the constituents offer the opportunity to create well-defined networks at TIs surfaces. Even more remarkably, we show that the symmetry of the overlayer can be finely controlled by appropriate chemical modifications. By analyzing the influence of the molecules on the TI electronic properties, we rationalize our results in terms of the charge redistribution taking place at the interface. Overall, our approach offers a precise and fast way to produce tailor-made nanoscale surface landscapes. In particular, our findings make organic materials ideal TIs c...Continue Reading

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Citations

Nov 26, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Yanfang GengQingdao Zeng
Sep 24, 2015·Nano Letters·Hung-Hsiang YangMinn-Tsong Lin
Apr 26, 2017·Nature Materials·Mirko CinchettiLuis E Hueso
May 31, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ada Della PiaGiovanni Costantini
Sep 30, 2016·Advanced Materials·Paolo SessiMatthias Bode
Mar 10, 2019·The Journal of Chemical Physics·D A DuncanF Allegretti
Apr 6, 2021·The Journal of Physical Chemistry Letters·Quanzhen ZhangYeliang Wang

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