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Spin structures in novel and low dimensional materials, studied by spin and angle resolved photoemission

Applicant Dil Jan Hugo
Number 128715
Funding scheme R'EQUIP
Research institution Physik-Institut Universität Zürich
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Condensed Matter Physics
Start/End 01.05.2010 - 31.12.2011
Approved amount 165'000.00
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Keywords (13)

Photoemission; Synchrotron radiation; Rashba effect; Quantum Well States; Quantum spin Hall effect; Novel materials; Spintronics; condensed matter physics; surface physics; spin-orbit coupling; superconductivity; Rashba; topological insulators

Lay Summary (English)

Lead
Lay summary
Spintronics is the vision of using the angular momentum of the electron, the so called electron spin, in stead of its charge to manipulate and transport information. The primary advantages are a lower energy consumption, faster processing and a possible link to novel computation architectures such as for example quantum computers. Although primarily magnetic systems come to mind when considering control of the electron spin, it has recently been shown that systems with a strong coupling of the angular and translational momentum of the electron (spin-orbit coupling) can be promising candidates. However, unlike in magnetic systems where the electron spin is aligned along a global quantization axis, in systems with strong spin-orbit interaction the spin orientation depends on the direction in which the electron moves, or the in-plane momentum. This means that in order to carefully characterize such systems it has to be possible to freely orient the sample in space, based on three translational directions and three rotation axis.Because the ideal technique to study such systems, spin and angle-resolved photoemission, is very sensitive to contamination of the surface, the experiments, and thus also the sample manipulation, have to be performed under ultra-high vacuum conditions. Furthermore, in many exciting phases of condensed matter, such as for example high temperature superconductivity, the electron spin is expected to play an important role. In order to also study these effects, it is necessary to cool the sample well below the phase-transition temperature.To master these challenges we will upgrade our current spin and angle-resolved photoemission set-up, COPHEE at the Swiss Light Source at the Paul Scherrer Institute, with a new type of sample manipulator which has been dubbed CARVING. In combination with our existing capabilities this new manipulator will facilitate an enhanced understanding of spin effects on surfaces.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Publications

Publication
Atom-specific spin mapping and buried topological states in a homologous series of topological insulators
Eremeev SV, Landolt G, Menshchikova TV, Slomski B, Koroteev YM, Aliev ZS, Babanly MB, Henk J, Ernst A, Patthey L, Eich A, Khajetoorians AA, Hagemeister J, Pietzsch O, Wiebe J, Wiesendanger R, Echenique PM, Tsirkin SS, Amiraslanov IR, Dil JH, Chulkov EV (2012), Atom-specific spin mapping and buried topological states in a homologous series of topological insulators, in NATURE COMMUNICATIONS, 3, 1638-1642.
Manipulating the Rashba-type spin splitting and spin texture of Pb quantum well states
Slomski B, Landolt G, Meier F, Patthey L, Bihlmayer G, Osterwalder J, Dil JH (2011), Manipulating the Rashba-type spin splitting and spin texture of Pb quantum well states, in PHYSICAL REVIEW B, 84(19), 193406-193411.
Large Tunable Rashba Spin Splitting of a Two-Dimensional Electron Gas in Bi2Se3
King PDC, Hatch RC, Bianchi M, Ovsyannikov R, Lupulescu C, Landolt G, Slomski B, Dil JH, Guan D, Mi JL, Rienks EDL, Fink J, Lindblad A, Svensson S, Bao S, Balakrishnan G, Iversen BB, Osterwalder J, Eberhardt W, Baumberger F, Hofmann P (2011), Large Tunable Rashba Spin Splitting of a Two-Dimensional Electron Gas in Bi2Se3, in PHYSICAL REVIEW LETTERS, 107(9), 096802-096806.
Topological Phase Transition and Texture Inversion in a Tunable Topological Insulator
Xu SY, Xia Y, Wray LA, Jia S, Meier F, Dil JH, Osterwalder J, Slomski B, Bansil A, Lin H, Cava RJ, Hasan MZ (2011), Topological Phase Transition and Texture Inversion in a Tunable Topological Insulator, in SCIENCE, 332(6029), 560-564.
Controlling the effective mass of quantum well states in Pb/Si(111) by interface engineering
Slomski B, Meier F, Osterwalder J, Dil JH (2011), Controlling the effective mass of quantum well states in Pb/Si(111) by interface engineering, in PHYSICAL REVIEW B, 83(3), 035409-035415.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
11th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures 03.10.2011 St. Petersburg, Russia
European materials research society fall meeting 19.09.2011 Wasaw, Poland
28th European conference on surface science 29.08.2011 Wroclaw, Poland
MaNEP Topical Meeting on Topological Properties of Electronic Materials 16.05.2011 Geneve, Switzerland
Edgar Lüscher Seminar 15.01.2011 Klosters, Switzerland
27th European Conference on Surface Science 30.08.2010 Groningen, The Netherlands
Low Energy Electron Dynamics in Solids 2010 05.07.2010 Les Diablerets, Switzerland


Associated projects

Number Title Start Funding scheme
170591 The role of spin-orbit interaction in non-interacting, topological and correlated systems 01.07.2017 SNSF Professorships
124691 Spin physics and electron dynamics at surfaces, interfaces and in ordered molecular layers 01.04.2009 Project funding (Div. I-III)
144742 The role of spin-orbit interaction in non-interacting, topological and correlated systems 01.07.2013 SNSF Professorships
173500 Efficient 2D spin detection of novel topological phases and buried interfaces 01.03.2017 International short research visits

Abstract

The spin of the electron plays an important role in many phenomena in condensed matter physics. Spin and angle-resolved photoemission is a powerful tool to determine the spin resolved band structure and Fermi surface of a variety of material types, especially in combination with synchrotron radiation.In order to extent the measurement possibilities of our spin and angle resolved photoemission set-up at the Swiss Light Source, a new sample manipulator is requested. The proposed manipulator can reach significantly lower temperatures, can be stabilized at any given temperature, has six degrees of freedom (three spatial directions and three rotational axis) and consists purely of non-magnetic materials.This will allow us to measure complex condensed matter phases and novel materials at low temperatures, such as the (quantum) spin Hall effect, momentum dependent spin-structures in low dimensional systems induced by the Rashba effect and related spin-orbit-interaction induced effects, superconductivity and other phases where the spin of the electron is expected to play an important role. Furthermore, the extra degree of rotational freedom of the new manipulator will allow us to measure smaller samples, previously inaccessible regions in reciprocal space and to perform symmetry operations which are currently impossible.The realm of experimental possibilities will be greatly enhanced by the implementation of this new sample manipulator, combined with the unique detection set-up currently available this can constitute the next leap forward in spin and angle resolved photoemission and thus in the understanding of many physical phenomena.
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