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 superconductors. It will harness novel phenomena and topological states resulting from the interaction in these hy... | show all >> show all members>>

 

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 induced by evaporating iron atoms and forming small iron clusters by atomic manipulation. The interpret... | show all >> show all members>>

 

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 fundamental interest in itself, but also practical considerations motivate us related, e.g., to a fut... | show all >> show all members>>

 

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 magnetic field induced by circularly polarized radiation; and (iii) edge photocurrents caused by th... | show all >> show all members>>

 

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. Atomically strong multi-terahertz fields will be used to accelerate Dirac fermions through the Brillo... | show all >> show all members>>

 

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 topological insulator surfaces, we will consider spin-related quantum transport effects due to spin-... | show all >> show all members>>

 

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 topological insulators directly. Simultaneously we employ high frequency techniques for spin injection co... | show all >> show all members>>

 

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 or weak antilocalization, we will characterize the effect strength. The experiments will be guided ... | show all >> show all members>>

 

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SFB 1277
Doris Meier
Universit├Ąt Regensburg

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