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ProMotion SIGNED

Probing Majorana quasi-particles and ballistic spin-momentum locking in topolocical insulatornanostructures

Total Cost €


EC-Contrib. €






 ProMotion project word cloud

Explore the words cloud of the ProMotion project. It provides you a very rough idea of what is the project "ProMotion" about.

observation    asymmetry    surface    peculiar    proven    dimensional    clean    metal    contacts    carrier    half    shapiro    array    strained    capacitance    superconductor    inducing    anomalous    proximity    resort    ballistic    experiments    probing    probe    conductance    spectrum    spintronics    nw    vortices    topologically    3d    wire    form    momentum    hunting    cross    unprecedented    sml    dirac    structures    mobility    fermions    promises    junctions    energy    conducting    quasi    three    electrons    manipulation    forming    quantization    complementary    particles    films    section    relativistic    magnetization    bulk    heterojunction    gap    superconducting    quantum    nano    potentially    ferromagnet    ti    locks    electrical    magnetic    voltages    hybrid    flux    locking    wave    geometry    trivial    quantized    mf    hgte    ups    local    vector    tunable    insulating    existence    utilize    material    charge    superconductivity    sc    majorana    nanowires    insulators    degeneracy    fault    computing    tolerant    linear    mfs    nws    flow    density    mimics    degenerate    measuring    lack    spin    normal    tis    constitute    point    adding    heart    detecting    height    topological   

Project "ProMotion" data sheet

The following table provides information about the project.


Organization address
postcode: 93053

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Germany [DE]
 Total cost 2˙498˙887 €
 EC max contribution 2˙498˙887 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2017-ADG
 Funding Scheme ERC-ADG
 Starting year 2018
 Duration (year-month-day) from 2018-07-01   to  2023-06-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    UNIVERSITAET REGENSBURG DE (REGENSBURG) coordinator 2˙498˙887.00


 Project objective

Three-dimensional topological insulators (3D-TI) feature an insulating bulk and conducting surface states. The energy spectrum of these surface states mimics the one of relativistic Dirac electrons, i.e., it is linear in wave-vector k, not spin-degenerate and the spin locks to the k-vector (spin-momentum locking (SML)). The lack of spin degeneracy makes TIs a promising system for detecting quasi-particles with properties of Majorana fermions (MF), being potentially useful for fault tolerant quantum computing. The other feature, SML, promises electrical manipulation of magnetization and is at the heart of spintronics. The focus of this project is on testing new concepts, set ups and experiments to probe MFs and SML in 3D-HgTe nano- and hybrid structures. Strained films of 3D-HgTe constitute a TI with unprecedented high charge carrier mobility enabling the observation of ballistic and quantum effects, thus being a very promising material system for these studies. For hunting MF we focus on clean 3D-HgTe nanowires (NW) with superconductor (SC) contacts inducing topological superconductivity in the TI. Here, we utilize the peculiar energy spectrum of TI-NWs, tunable from topologically trivial to topological by adding half a flux quantum through the wire’s cross section. The existence of MFs forming at the superconducting wire’s end shall be proven by (i) anomalous conductance quantization at point contacts, (ii) measuring the anomalous height of Shapiro steps in SC-NW-SC junctions and by (iii) probing quantized conductance in SC-NW-normal metal junctions. In a complementary new approach (iv) we measure the quantum capacitance in an array of magnetic vortices in a SC-TI heterojunction to probe the density of states in the proximity induced superconducting gap, where MFs are expected to form. For probing SML in ballistic ferromagnet-HgTe hybrid systems we resort to a novel geometry (v) which measures the asymmetry of current flow rather than local or non-local voltages.


year authors and title journal last update
List of publications.
2019 Jimin Wang, Markus Schitko, Gregor Mussler, Detlev Grützmacher, Dieter Weiss
Capacitance–Voltage Measurements of (Bi 1– x Sb x ) 2 Te 3 Field Effect Devices
published pages: 1800624, ISSN: 0370-1972, DOI: 10.1002/pssb.201800624
physica status solidi (b) 256/7 2020-03-05
2019 S. Hubmann, S. Gebert, G. V. Budkin, V. V. Bel\'kov, E. L. Ivchenko, A. P. Dmitriev, S. Baumann, M. Otteneder, J. Ziegler, D. Disterheft, D. A. Kozlov, N. N. Mikhailov, S. A. Dvoretsky, Z. D. Kvon, D. Weiss, S. D. Ganichev
High-frequency impact ionization and nonlinearity of photocurrent induced by intense terahertz radiation in HgTe-based quantum well structures
published pages: , ISSN: 2469-9950, DOI: 10.1103/physrevb.99.085312
Physical Review B 99/8 2020-03-05

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