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Scanning tunneling spectroscopy
About: Scanning tunneling spectroscopy is a research topic. Over the lifetime, 7886 publications have been published within this topic receiving 213828 citations.
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Donostia International Physics Center1, Spanish National Research Council2, Ikerbasque3, École Polytechnique Fédérale de Lausanne4, SLAC National Accelerator Laboratory5, Lawrence Berkeley National Laboratory6, Korea Institute of Science and Technology7, Nanjing University8, University of California, Berkeley9, Autonomous University of Madrid10, Geballe Laboratory for Advanced Materials11
TL;DR: Ugeda et al. as mentioned in this paper observed edge states at the crystallographically aligned interface between a single layer quantum spin Hall insulator 1T′-WSe2 and a semiconductor 1H − WSe2 in contiguous single layers and confirmed the predicted penetration depth of one-dimensional interface states into the two-dimensional bulk of a QSHI.
Abstract: Transition metal dichalcogenide materials are unique in the wide variety of structural and electronic phases they exhibit in the two-dimensional limit. Here we show how such polymorphic flexibility can be used to achieve topological states at highly ordered phase boundaries in a new quantum spin Hall insulator (QSHI), 1T′-WSe2. We observe edge states at the crystallographically aligned interface between a quantum spin Hall insulating domain of 1T′-WSe2 and a semiconducting domain of 1H-WSe2 in contiguous single layers. The QSHI nature of single-layer 1T′-WSe2 is verified using angle-resolved photoemission spectroscopy to determine band inversion around a 120 meV energy gap, as well as scanning tunneling spectroscopy to directly image edge-state formation. Using this edge-state geometry we confirm the predicted penetration depth of one-dimensional interface states into the two-dimensional bulk of a QSHI for a well-specified crystallographic direction. These interfaces create opportunities for testing predictions of the microscopic behavior of topologically protected boundary states. Transition metal dichalcogenides may host exotic topological phases in the two-dimensional limit, but detailed atomic properties have rarely been explored. Here, Ugeda et al. observe edge-states at the interface between a single layer quantum spin Hall insulator 1T′-WSe2 and a semiconductor 1H-WSe2.
77 citations
TL;DR: In this paper, the spectral weight of NiMnSb was evaluated and the possible experimental investigation (Bremsstrahlung isohromat spectroscopy, nuclear magnetic resonance, scanning tunneling microscopy and Andreev reflection) was discussed.
Abstract: Nonquasiparticle states above the Fermi energy are studied by first-principle dynamical mean field calculations for a prototype half-metallic ferromagnet NiMnSb. We present a quantitative evaluation of the spectral weight of this characteristic feature and discuss the possible experimental investigation (Bremsstrahlung isohromat spectroscopy, nuclear magnetic resonance, scanning tunneling microscopy, and Andreev reflection) to clarify the existence of these states.
77 citations
TL;DR: This paper calculates the properties of a weak charge-transfer optical absorption band, whose predicted characteristics are a direct and simple consequence of the model that describes vibronically coupled tunneling.
77 citations
TL;DR: In this paper, the authors report the ability to completely restructure a metal surface by precision manipulation of individual atoms with the scanning tunneling microscope, including extracting atoms from kink sites on Cu(211) and creating adatom-vacancy pairs.
Abstract: We report the ability to completely restructure a metal surface by precision manipulation of individual atoms with the scanning tunneling microscope: Besides extracting atoms from kink sites on Cu(211) we are now also able to “dig out” atoms from the even more strongly bound intrinsic step sites and thus to create adatom-vacancy pairs. Together with the processes of moving adatoms along and across intrinsic step edges and the possibility of healing out adatom-vacancy pairs, we have a complete set of lateral manipulation processes at hand. The reliability of all these processes opens up exciting “engineering” possibilities for structuring of extended surface areas. [S0031-9007(97)02523-4]
77 citations
TL;DR: GXSM is a full featured and modern scanning probe microscopy (SPM) software that can be used both in stand alone mode for powerful image processing and analysis and connected to an instrument operating many different flavors of SPM.
Abstract: GXSM is a full featured and modern scanning probe microscopy (SPM) software. It can be used both in stand alone mode for powerful image processing and analysis and connected to an instrument operating many different flavors of SPM, e.g., scanning tunneling microscopy and atomic force microscopy or in general two-dimensional multichannel data acquisition instruments. The GXSM core can handle different data types, e.g., integer and floating point numbers. An easily extendable plug-in architecture provides many image analysis and manipulation functions. A digital signal processor subsystem runs the feedback loop, generates the scanning signals, and acquires the data during SPM measurements. In addition it performs sophisticated spectroscopy tasks such as scanning tunneling spectroscopy. The GXSM software is released under the GNU general public license and can be obtained via the Internet.
77 citations