2018年10月8日 · Among all surface sensitive measurements, QPI which is acquired via scanning tunneling microscopy (STM) may be the most direct method to reveal the unique physics of surface states.

2018年10月4日 · In summary, we have characterized the single-layer 1T’-WTe 2 with high-resolution QPI-STS/STM, and verified a semimetal band structure, where there exists a band inversion near the Γ point ...

In this work, we systematically investigated the surfaces of a CoSi single crystal by using a high-resolution scanning tunneling microscopy (STM)/scanning tunneling spectroscopy (STS) technique and proved the surface Fermi arc states through quasiparticle interference (QPI) measurement, which is corroborated by density functional theory (DFT ...

2009年8月30日 · Recently, researchers using STS have exploited quasiparticle interference (QPI)—wave-like electrons that scatter off impurities to produce periodic interference patterns—to infer...

2018年10月16日 · 近日，南京大学李绍春教授（通讯作者）课题组在二维拓扑绝缘体研究领域取得重大进展，研究人员借助高分辨扫描隧道显微镜和准粒子干涉技术，精确表征了单层1T’-WTe 2 的能带结构，确定其为半金属型能带，解决了一直以来存在的争议。 同时，研究人员在费米面附近观察到一个独特的能隙。 通过STM表征，发现该能隙一直被钉扎在费米面处，并且可以随着费米能级的位置调控而移动。 通过分析，研究人员发现该能隙不同于自旋轨道耦合（SOC）带隙，它 …

准粒子干涉 (qpi) 成像是研究量子材料低能电子结构的有力工具。 然而，通过扫描隧道显微镜 (STM) 测量 QPI 仅限于表面，因此本质上受限于二维。 QPI 已证明在研究具有准二维电子结构的材料方面非常成功，但它提出了如何在具有高度三维电子结构的材料中解释 ...

In this paper, we perform a detailed QPI analysis of the surface states of the topological insulator Bi2Te3. A general TR-invariant impurity potential including scalar and spin-orbit scattering components is studied using the standard T-matrix formalism.

2014年4月8日 · While conventional constant-separation STS shows two broad features, which are interpreted as the bulk band and -like Shockley-type surface state (-SS), energy-dependent Fourier-transformed QPI maps reveal the band dispersion …

2017年1月31日 · Then, we will discuss the formation of Friedel oscillation due to QPI in constant energy contours of electron bands, and show the basic concept of Fourier-transform scanning tunneling microscopy/spectroscopy (FT-STM/STS), which can resolve Friedel oscillation patterns in real space and consequently obtain the QPI patterns in reciprocal space.

2023年10月19日 · We analyze modulations of the local density of states (LDOS) near and away from Fe vacancy defects separately and identify quasiparticle interference (QPI) signals originating from multiple...