Emergent Relativistic Effects in Condensed Matter
From Fundamental Aspects to Electronic Functionality
Project Area
A
Effective Dirac Fermions

Project A01

C. Back
D. Bougeard
D. Schuh

Topological insulators: band structure engineering, interfaces and hybrid structures

Project A01 studies semiconductors interfaced with ferromagnets and superconductors in hybrid thin film structures. The project will target both (Bi1-xSbx)2(Te1-ySey)3 topological insulators interacting with ferromagnets and two-dimensional electron systems in strong spin-orbit materials such as InAs or InSb interfaced with thin film superconductor... | show all >>

 

Project A02

F. Giessibl
H. Ebert

Structure and conductivity of surfaces on topological insulators

We will reveal the connection between surface structure and electronic properties of topological insulators by means of scanning probe microscopy and spectroscopy in combination with theoretical work based on density functional theory. We plan in particular to study the response of topological insulators to magnetic perturbations on the surface ind... | show all >>

 

Project A03

F. Evers

Charge dynamics and transport in grains of topological matter

In defect-free, topologically nontrivial materials the concept of topology is formally closely related to the electronic band structure. In this project, we investigate nanoscale samples with discrete spectra, which are made from such materials. We ask how topology enters physical observables in the absence of a band structure. The question is of f... | show all >>

 

Project A04

S. Ganichev

Terahertz spectroscopy of Dirac fermion systems

The aim of the project is to explore optoelectronic phenomena induced by high power monochromatic terahertz (THz) radiation in 2D and 3D topological insulators and graphene. By applying strong-field terahertz spectroscopy we plan to study: (i) energy spectrum reconstruction by intense terahertz electric fields; (ii) photovoltaic Hall effect at zero... | show all >>

 

Project A05

R. Huber
C. Lange

Ultrafast dynamics of Dirac fermions in topological insulators

We exploit few-cycle multi-terahertz pulses to probe, image and accelerate Dirac fermions on the surface of 3D topological insulators. With latest femtosecond near-field optical microscopy, we will target the spatio-temporal dynamics of Dirac quasiparticles and collective plasmons in topological surface states of (Bi,Sb)2(Se,Te)3-based compounds. A... | show all >>

 

Project A07

K. Richter
J.D. Urbina

Quantum transport and time-dependent dynamics of Dirac fermions

Overarching goal is the investigation of phenomena arising from specific spin-momentum locking of Dirac-type fermions in graphene and in particular in topological insulators. We will explore in a spatially and time-resolved manner Dirac-like charge carrier dynamics in these systems subject to short pulses or external radiative driving. Further, at ... | show all >>

 

Project A08

D. Weiss
C. Back

Spin-momentum locking in 3D topological insulators

Within project A08 we plan to investigate spin momentum locking and its potential for manipulating thin magnetic films grown on top of topological insulators. On the one hand it is planned to study the physics of spin momentum locking employing dc transport experiments where we resort to novel device geometry to probe spin momentum locking in topol... | show all >>

 

Project A09

J. Eroms
J. Fabian

Controllable spin-orbit interaction in graphene

In this project we will enhance spin-orbit interaction in graphene in a controlled fashion by contact to transition metal dichalcogenides, such as WSe2 and also by intercalation of metal atoms. In particular, we will realize a spatially varying spin-orbit interaction strength. By using complementary methods, such as spin transport, spin Hall effect... | show all >>

 

Contact

SFB 1277
Doris Meier
Universit├Ąt Regensburg

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