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Doping effects in Dirac materials and their interfaces: A route to spintronic applications

Applicant Salman Zaher
Number 165910
Funding scheme Project funding (Div. I-III)
Research institution Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Condensed Matter Physics
Start/End 01.06.2016 - 31.05.2019
Approved amount 177'364.00
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Keywords (6)

Topological Insulators; muon spin spectroscopy; Dirac materials; soft x-ray ARPES; Spintronic Devices; Interface Phynomena

Lay Summary (German)

Lead
Die Klasse der Dirac-Materialien enthält neue exotische Materialien wie topologische Isolatoren und Weyl Halbmetalle. Diese Materialien werden durch ein spezielles Verhalten ihrer Elektronen gekennzeichnet, das zuvor nicht beobachtet wurde. Dieses Verhalten eröffnet die Möglichkeit für ihre Anwendung in neuen technischen Geräte. Die Eigenschaften solcher Materialien können weiter durch Dotierung von magnetischen Elementen in ihrer chemischen Struktur abgestimmt werden und damit das Potenzial für praktische Anwendungen erweitern.
Lay summary
Das Ziel dieses Projektes ist es, Methoden zur Verfügung zu stellen, die unsere Fähigkeit, bei der Verwendung einer Kombination von Dirac Materialien vorantreiben, neue Nano-Geräte zu entwickeln, die die elektronischen und magnetischen Eigenschaften von Elektronen, oder die sogenannten Spintronik-Geräte nutzen. Zu diesem Zweck werden wir einzigartige experimentelle Methoden verwenden die nur am Paul Scherrer Institut (PSI) in der Schweiz zur Verfügung stehen. Diese Methoden ermöglichen ein besseres Verständnis der grundlegenden Eigenschaften dieser Materialien ermöglichen. Wir werden die Entwicklung der elektronischen und magnetischen Eigenschaften mit zunehmendem Gehalt an magnetischen Elemente untersuchen, um zu erfahren, wie wir können, um sie für unsere Anwendungen können abstimmen.

Die komplementären experimentellen Techniken innerhalb der PSI Forschungsinfrastruktur mit Theorie sind daher die grösste Stärke unseres Kooperationsprojekt. Es wird die Position und die Sichtbarkeit der PSI und der Schweizer Wissenschaft im Allgemeinen in der heissen und hart umkämpften Feld der Spintronik Grundlagen und Anwendungen stärken.
Direct link to Lay Summary Last update: 26.04.2016

Lay Summary (English)

Lead
The class of Dirac materials includes new exotic materials such as topological insulators and Weyl semimetals. These materials are characterized by a special behaviour of their electrons, which has not been observed before, and opens the possibility for their application in novel technological devices. The properties of such materials can be further tuned by incorporating magnetic elements in their chemical structure, and thus expanding the potential for practical applications.
Lay summary

The aim of this project is to provide methods that advance our ability in using a combination of Dirac materials, to engineer new nano-devices that utilize the electronic and magnetic properties of electrons, or the so called spintronic devices. For this purpose, we will use unique experimental methods, available only at the Paul Scherrer Institut (PSI) in Switzerland, that enable better understanding of the fundamental properties of these materials. We will investigate the evolution of the electronic and magnetic properties with increasing content of magnetic elements to learn how we can tune them for our applications.

The complementary experimental techniques within the PSI research infrastructure combined with theory constitute the main strength of our collaborative project. It will strengthen the stand and visibility of PSI and Swiss science in general in the hot and highly competitive field of spintronics fundamentals and applications.

Direct link to Lay Summary Last update: 26.04.2016

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
k-resolved electronic structure of buried heterostructure and impurity systems by soft-X-ray ARPES
Strocov V.N., Lev L.L., Kobayashi M., Cancellieri C., Husanu M.-A., Chikina A., Schröter N.B.M., Wang X., Krieger J.A., Salman Z. (2019), k-resolved electronic structure of buried heterostructure and impurity systems by soft-X-ray ARPES, in Journal of Electron Spectroscopy and Related Phenomena, 236, 1-8.
Chiral topological semimetal with multifold band crossings and long Fermi arcs
Schröter Niels B. M., Pei Ding, Vergniory Maia G., Sun Yan, Manna Kaustuv, de Juan Fernando, Krieger Jonas. A., Süss Vicky, Schmidt Marcus, Dudin Pavel, Bradlyn Barry, Kim Timur K., Schmitt Thorsten, Cacho Cephise, Felser Claudia, Strocov Vladimir N., Chen Yulin (2019), Chiral topological semimetal with multifold band crossings and long Fermi arcs, in Nature Physics, 15(8), 759-765.
Band structure of overdoped cuprate superconductors: Density functional theory matching experiments
Kramer K. P., Horio M., Tsirkin S. S., Sassa Y., Hauser K., Matt C. E., Sutter D., Chikina A., Schröter N. B. M., Krieger J. A., Schmitt T., Strocov V. N., Plumb N. C., Shi M., Pyon S., Takayama T., Takagi H., Adachi T., Ohgi T., Kawamata T., Koike Y., Kondo T., Lipscombe O. J., Hayden S. M., et al. (2019), Band structure of overdoped cuprate superconductors: Density functional theory matching experiments, in Physical Review B, 99(22), 224509-224509.
Surface resonance of thin films of the Heusler half-metal Co2MnSi probed by soft x-ray angular resolved photoemission spectroscopy
Lidig Christian, Minár Jan, Braun Jürgen, Ebert Hubert, Gloskovskii Andrei, Krieger Jonas A., Strocov Vladimir, Kläui Mathias, Jourdan Martin (2019), Surface resonance of thin films of the Heusler half-metal Co2MnSi probed by soft x-ray angular resolved photoemission spectroscopy, in Physical Review B, 99(17), 174432-174432.
Electronic properties of candidate type-II Weyl semimetal WTe 2 . A review perspective
Das P K, Di Sante D, Cilento F, Bigi C, Kopic D, Soranzio D, Sterzi A, Krieger J A, Vobornik I, Fujii J, Okuda T, Strocov V N, Breese M B H, Parmigiani F, Rossi G, Picozzi S, Thomale R, Sangiovanni G, Cava R J, Panaccione G (2019), Electronic properties of candidate type-II Weyl semimetal WTe 2 . A review perspective, in Electronic Structure, 1(1), 014003-014003.
Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface?
Krieger J. A., Ou Y., Caputo M., Chikina A., Döbeli M., Husanu M.-A., Keren I., Prokscha T., Suter A., Chang Cui-Zu, Moodera J. S., Strocov V. N., Salman Z. (2019), Do topology and ferromagnetism cooperate at the EuS/Bi2Se3 interface?, in Physical Review B, 99(6), 064423-064423.
Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates
Horio M., Hauser K., Sassa Y., Mingazheva Z., Sutter D., Kramer K., Cook A., Nocerino E., Forslund O. K., Tjernberg O., Kobayashi M., Chikina A., Schröter N. B. M., Krieger J. A., Schmitt T., Strocov V. N., Pyon S., Takayama T., Takagi H., Lipscombe O. J., Hayden S. M., Ishikado M., Eisaki H., Neupert T., et al. (2018), Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates, in Physical Review Letters, 121(7), 077004-077004.
Microscopic effects of Dy doping in the topological insulator Bi2Te3
Duffy L. B., Steinke N.-J., Krieger J. A., Figueroa A. I., Kummer K., Lancaster T., Giblin S. R., Pratt F. L., Blundell S. J., Prokscha T., Suter A., Langridge S., Strocov V. N., Salman Z., van der Laan G., Hesjedal T. (2018), Microscopic effects of Dy doping in the topological insulator Bi2Te3, in Physical Review B, 97(17), 174427-174427.
Superconducting Properties of Cu Intercalated Bi2Se3 Studied by Muon Spin Spectroscopy
Krieger Jonas A., Kanigel Amit, Ribak Amit, Pomjakushina Ekaterina, Chashka Khanan B., Conder Kazimierz, Morenzoni Elvezio, Prokscha Thomas, Suter Andreas, Salman Zaher (2018), Superconducting Properties of Cu Intercalated Bi2Se3 Studied by Muon Spin Spectroscopy, in Proceedings of the 14th International Conference on Muon Spin Rotation, Relaxation and Resonance (μS, Sapporo, JapanJPS, Japan.
Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators
Krieger J. A., Chang Cui-Zu, Husanu M.-A., Sostina D., Ernst A., Otrokov M. M., Prokscha T., Schmitt T., Suter A., Vergniory M. G., Chulkov E. V., Moodera J. S., Strocov V. N., Salman Z. (2017), Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators, in Physical Review B, 96(18), 184402-184402.
Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2
Di Sante Domenico, Das Pranab Kumar, Bigi C., Ergönenc Z., Gürtler N., Krieger J. A., Schmitt T., Ali M. N., Rossi G., Thomale R., Franchini C., Picozzi S., Fujii J., Strocov V. N., Sangiovanni G., Vobornik I., Cava R. J., Panaccione G. (2017), Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2, in Physical Review Letters, 119(2), 026403-026403.

Collaboration

Group / person Country
Types of collaboration
A. Suter, NUM/PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
E. Morenzoni, NUM/PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
J. S. Moodera, MIT United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
M. Shi, SLS/PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
C. Mudry, NUM/PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
J. Robinson, University of Cambridge Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
T. Prokscha, NUM/PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
A. Kanigel, Technion - Israel institute of technology Israel (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
C.-Z. Chang, Penn State University United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
E. Pomjakushina , NUM/PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
A. Balatsky, NORDITA Sweden (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
J. Mesot, ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
K. He, Tsinghua University China (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
APS March Meeting 2019 Talk given at a conference Bulk electronic and local magnetic properties of semiconducting 2H-MoTe2 07.03.2019 Boston, United States of America Krieger Jonas;
APS March Meeting 2019 Talk given at a conference Experimental evidence of proximity induced odd-frequency superconductivity in a topological insulator 05.03.2019 Boston, United States of America Salman Zaher;
ISOLDE Seminar- CERN Individual talk Applications of low energy spin polarized probes in condensed matter 27.02.2019 Geneva, Switzerland Salman Zaher;
The International Conference on HYPERFINE Interactions and their Applications (HFI2019) Talk given at a conference A Local Spin Probe Perspective on Topological Materials 10.02.2019 Goa, India Salman Zaher;
Spectroscopy on Novel Material Group Workshop Talk given at a conference Bulk electronic and local magnetic properties of semiconducting 2H-MoTe2 15.01.2019 Saas-Grund, Switzerland Krieger Jonas;
Spectroscopy on Novel Material internal workshop Talk given at a conference Using muon spin spectroscopy to probe magnetism and superconductivity 19.09.2018 Villigen, Switzerland Krieger Jonas;
Photoelectron Spectroscopy at the SLS 2.0 - Joint Users Meeting of the SX-ARPES (ADRESS), PEARL and SIS Beamlines Poster Resonant soft X-ray photoemission on buried intefaces and impurities at ADRESS 10.09.2018 Villigen, Switzerland Krieger Jonas;
SPS meeting 2018 Talk given at a conference Experimental evidence of proximity induced odd-frequency superconductivity in a topological insulator 28.08.2018 Lausanne, Switzerland Krieger Jonas;
New Trends in Topological Insulators and Narrow Gap Systems, NTTI2018 and NGS18 Talk given at a conference Experimental evidence of proximity induced odd-frequency superconductivity in a topological insulator 16.07.2018 Luxembourg, Luxembourg Krieger Jonas;
Spectroscopy on Novel Material group meeting Talk given at a conference Magnetic proximity effects at buried topological insulator interfaces 12.02.2018 Villigen, Switzerland Krieger Jonas;
PSI Condensed Matter Retreat Talk given at a conference Evidence for proximity induced p-wave superconductivity in a topological insulator 15.11.2017 Windisch, Switzerland Krieger Jonas;
SPS meeting 2017 Talk given at a conference Spectroscopic perspective on the interplay between electronic and magnetic properties of doped topological insulators 21.08.2017 Geneva, Switzerland Krieger Jonas;
New Trends in Topological Insulators 2017, NTTI2017 Talk given at a conference Engineering of topological insulators by magnetic doping 16.07.2017 Ascona, Switzerland Krieger Jonas;
The 14th International Conference on Muon Spin Rotation, Relaxation and Resonance Talk given at a conference Engineering of topological insulators by magnetic doping 25.06.2017 Sapporo, Japan Krieger Jonas;
The 14th International Conference on Muon Spin Rotation, Relaxation and Resonance Poster Measurement of the superconducting properties of the topological superconductor candidate Cu intercalated Bi2Se3 25.06.2017 Sapporo, Japan Krieger Jonas;
TOP-SPIN 3: Spin and Topological Phenomena in Nanostructures - Towards Topological Materials Science Talk given at a conference Engineering of topological insulators by magnetic doping 25.04.2017 Dresden, Germany Krieger Jonas;
Laboratory for muon spin spectroscopy retreat Talk given at a conference Tuning the electronic structure of magnetically doped topological materials 07.03.2017 Thun, Switzerland Krieger Jonas;
Spectroscopy on Novel Material Group Workshop Talk given at a conference Tuning the electronic structure of magnetically doped topological materials 13.01.2017 Saas-Grund, Switzerland Krieger Jonas;
NUM/SYN/SwissFEL condensed matter retreat Talk given at a conference Tuning the electronic structure of magnetically doped topological materials 04.10.2016 Windisch, Switzerland Krieger Jonas;
SPS meeting 2016 Talk given at a conference Strong enhancement of s-wave superconductivity near a quantum critical point of (Ca1-xSrx)3Ir4Sn13 and (Ca1-xSrx)3Rh4Sn13 23.08.2016 Lugano, Switzerland Krieger Jonas;


Associated projects

Number Title Start Funding scheme
183300 High-resolution soft-X-ray ARPES facility at Swiss Light Source 01.03.2019 R'EQUIP
188709 Momentum- and Spin-Resolved Electronic Structure of Buried Oxide Interfaces (ctd.) 01.11.2019 Project funding (Div. I-III)

Abstract

The class of Dirac materials (DMs) including, apart from graphene, new exotic materials such as topological insulators (Bi2 Se3, Sb2 Te3, etc) and Weyl semimetals (NbAs, TaAs) are characterized by cones of linear electron dispersion in the vicinity of the Fermi level. Doping these materials with magnetic impurities opens a gap between the Rashba bands in otherwise time-inversion protected zero-momentum point. One of the hopes of solid-state physics in this field is to discover a system where the magnetic doping shifts this gap to the Fermi level. In this case the spin orientation becomes locked to the electron momentum, resembling the so-called Majorana fermions. With potential applications of such systems varying from magnetic transport to superconductivity, this anticipated discovery will immediately revolutionize the whole field of spintronics, pushing it from its present fundamental research domain to practical realization of spintronics devices.In this proposal, the main class of the investigated DM will be (magnetically) doped topological insulators (TIs) and their interfaces, where novel functionalities can be formed through interaction of the topologically protected surface states with impurities or different electronic states in the bulk. The focus will be on (but not limited to) the local magnetic and electronic properties of doped thin films and single crystals of TIs and Weyl semimetals, with the aim of gaining better understanding of their intriguing fundamental properties and the prospect of their spintronics applications.The DM systems will be explored with a complementary combination of low-energy muon spin relaxation (LE-µSR) and soft-X-ray ARPES (SX-ARPES) at PSI. The LE-µSR spectrometer is a worldwide unique facility which utilizes low energy (1-30 keV) spin polarized muons whose depth resolving capability coupled with high sensitivity to local magnetic fields provide a powerful tool to study local magnetic and electronic properties of buried heterostructures and impurities. The worldwide most advanced SX-ARPES facility at SLS enables direct access to a complementary aspect of buried interfaces, band dispersion resolved in electron momentum and elemental character. A multi-channel spin detector iMott enables so far unthinkable studies of spin-resolved electron dispersion in buried heterostructure and impurities systems of DMs.The complementary experimental techniques within the PSI research infrastructure combined with theory constitute the main strength of our collaborative project. It will strengthen the stand of PSI in the hot and highly competitive field of spintronics fundamentals and applications. Moreover, this will be a pioneering project combining these experimental methods, which we hope will attract potential new users for both involved facilities.
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