The ever expanding photoemission toolbox

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Seminar
Speaker
Justin Wells, Trondheim University
Date
15/06/2015 - 16:00 - 15:00
Place
seminar room on the 9th floor of the nano building (206)
Abstract
From its origins as a curious illustration of the photo-electric effect (Einstein, ca. 1905) and later as a tool for chemical analysis (Siegbahn, ca. 1967), photoemission spectroscopy has more recently developed into a very versatile tool for solid state physics. A continually improving understanding, paralleled by continually improving instrumentation is both increasing the prominence of photoemission, and broadening its relevance.

In this talk, I will use our recent research to illustrate a broad range of photoemission-based techniques: 

1. The role of XPS and resonant XPS in understanding materials as diverse as graphene, chemotherapy drugs [1] and intermediate band photovoltaics.

2. ARPES as a tool for understanding surface and non-surface localised confined states for organic electronics and quantum computation applications [2].

3. Spin-resolved ARPES for a fundamental understanding of topological insulators and spin-orbit coupled systems [3,4].

4. Engineering novel confined systems using photoemission microscopy, and 

5. Creating and understanding novel phonon interactions through a combination of ARPES, many-body simulations and transport measurements [5,6].

 
References:
[1] Silver catalyzed Fluorouracil degradation; a promising new role for graphene, Mazzola et al., arXiv preprint arXiv:1411.2096 and 2D materials, accepted (2015).
 
[2] Valley Splitting in a Silicon Quantum Device Platform, Miwa et al., Nano letters 14 (3), 1515-1519 (2014)
 
[3] One-dimensional spin texture of Bi (441): Quantum spin Hall properties without a topological insulator,  Bianchi, et al., Physical Review B 91:165307 (2015)
 
[4] Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor, Riley et al., Nature Physics 10 (11), 835-839 (2014)
 
[5] Kinks in the σ Band of Graphene Induced by Electron-Phonon Coupling, Mazzola et al., Physical review letters 111 (21), 216806 (2013)
 
[6] Disentangling phonon and impurity interactions in δ-doped Si (001), Mazzola et al., Applied Physics Letters 104 (17), 173108 (2014).