CONTROL AND DYNAMICS OF QUANTUM MATERIALS

Spin-orbit Coupling, Correlations, and Topology

© Simon Wegener

News & Events

News

Archive

  • Klaus-Liebrecht prize for Niels Ehlen

    Niels Ehlen of the Grüneis group was awarded the prestigious Klaus Liebrecht Preis for his master thesis on 2D functional quantum materials. During his MSc and ongoing PhD thesis works, Niels has found a new way to induce flat energy bands in graphene and studied the electronic properties of interfaces between materials having Dirac and Schrödinger type of energy dispersion relations.

     

  • Professor position for Jean-Sebastien Bernier

    Jean-Sebastien Bernier has started his assistant professor position in Nov. 2020 at the University of Northern British Columbia. We congratulate and wish all the best for a successful future.

     

  • Professor position for Zhe Wang

    Zhe Wang has started  his full professor position in Oct 2020 at the University of Dortmund. From there he will continue to contribute to our CRC as a PI. We congratulate and wish all the best for our future collaboration.

  • We are hiring!

    There is currently one open PhD position in the field of pin-polarized STM of 2D materials in Prof. Michely's group.

    more information

Events

© Simon Wegener

RESEARCH PROFILE

COLLABORATIVE RESEARCH CENTER 1238

Control and Dynamics of Quantum Materials

Spin orbit coupling, correlations, and topology

Advances in materials science are one of the strongest drivers of technological innovations and thereby shape our daily life, though often in an unseen way. Powerful examples from recent years include the advent of novel memory technologies building on magnetoresistance read/write heads, ferroelectric, and phase-change memories. The discovery of fascinating materials like graphene has led to a worldwide surge of research initiatives for innovative applications of these and other novel two dimensional materials. Spin-orbit coupled materials such as the recently discovered topological insulators from a new class of solids that have a strong potential for novel functionalities.

 

Material-based technological innovations are more often than not initiated on the basic-science level through discoveries of new concepts, phenomena, and principles governing the physical properties of quantum materials. Research on quantum materials is a rapidly developing and internationally highly competitive interdisciplinary field. At the forefront of this field, new materials are being investigated in which relativistic spin-orbit effects and non-trivial topologies are at center stage. At the same time, materials with strong electronic correlations exhibit a wealth of non-trivial quantum ordering phenomena including superconductivity, magnetism, and other exotic orders. Precisely at the intersection of these research fields, our collaborative research center aims at exploring, understanding, developing, and utilizing quantum materials to gain deliberate control of the physical properties of these materials and to understand their dynamics, explore driven states of matter, and enable new functionalities.

 

Our diverse team of principle investigators includes scientists from experimental and theoretical physics as well as crystallography, building and expanding on the excellent research infrastructure in Cologne embedded in the Excellence Initiative key profile area 'quantum matter and materials'. The Cologne team is augmented by excellent scientists with indispensable expertise from the University of Bonn and the Forschungszentrum Jülich. Guiding philosophies of our program are the ‘materials - physical properties - theory' cycle, which is one of the cornerstones of the success of condensed-matter physics at the University of Cologne, and a multifaceted approach arising from addressing scientific topics from a variety of different perspectives as defined in the focus areas of the program.

 

The CRC will consolidate and expand Cologne together with the associated groups from Bonn and Jülich as a leading international center within quantum condensed-matter physics. Our vision is to discover, understand, and control novel collective phenomena in quantum materials arising from the interplay of spin-orbit coupling, correlations, and topology.

© Simon Wegener

TEAM OF PRINCIPAL INVESTIGATORS

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Yoichi Ando

A04 /         /


topological materials,
superconductivity,
materials synthesis,

transport measurements

Nicolae Atodiresei

C01

 

first principles simulations,

molecular nanostructures,

hybrid interfaces, molecular

electronics and spintronics

Petra Becker-Bohatý

A02

 

crystal chemistry,

structural crystallography,

crystal growth, crystal physics,

materials science

Stefan Blügel

C01

 

theory of electronic properties of real solids, spintronics,

low-dimensional systems,

spin-orbit related phenomena

B01

B06

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Markus Braden

A02 / B04

 

strongly correlated electrons, magnetism, x-ray and neutron scattering, crystallography, sample synthesis

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Jens Brede

B06

 

scanning tunneling microscopy, hybrid interfaces, and topological defects

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Oliver Breunig

B01

 

topological materials, nanodevice fabrication, mesoscopic transport, low-dimensional magnetism, thermodynamics

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Sebastian Diehl

C03 / C04

 

driven open quantum systems, topological order out of equilibrium, functional renormalization group techniques, Keldysh path integrals

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Alexander Grüneis

A01

 

2D materials: synthesis and

functionalization photoelectron spectroscopy

Raman spectroscopy

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Markus Grüninger

B02 / B03

 

exp. condensed matter physics, optical spectroscopy, strongly correlated  electron systems, spins and orbitals,

topological insulators

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Joachim Hemberger

B02

 

broadband dielectric and optical spectroscopy, frustrated magnetism,

ferroelectrics, multiferroics,

spin-ice, (quantum-)critical dynamics

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Ciarán Hickey

C03

 

condensed matter theory, strongly correlated electron systems, quantum magnetism, topological phases

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Corinna Kollath

C05

 

correlated many body systems, non-equilibrium phenomena in quantum

systems, numerical many-body physics

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Thomas Lorenz

A02 / B01

 

thermodynamics and transport, crystal growth,
frustrated quantum spin systems, spin-state transitions, multiferroics

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Thomas Michely

A01 / B06

 

thin film growth kinetics and

epitaxy (oxides, metals, organics), epitaxial graphene and 2D-layers, scanning tunneling microscopy and spectroscopy

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Achim Rosch

C02 / C04

 

condensed matter theory,

topological states, spin torques and skyrmions,

quantum phase transitions,

non-equilibrium and equilibration

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Michael Scherer

C02

 

condensed matter theory, strongly correlated fermions, quantum critical phenomena, moiré materials

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Alexey Taskin

A04

 

experimental condensed matter physics, topological materials, molecular beam epitaxy, transport measurements

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Simon Trebst

C02 / C03

 

condensed matter theory,

correlated electron systems,

frustrated quantum magnets,

topological order, entanglement, numerical many-body physics

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Paul van Loosdrecht

B03 / B05

 

optically induced phenomena and non-equilibrium states of matter, steady state and time resolved advanced optical spectroscopy

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Ionela Lindfors-Vrejoiu

A01

 

epitaxy of complex oxides, ferromagnetic and ferroelectric oxide thin films and superlattices, pulsed-laser deposition

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Zhe Wang

B05

 

correlated matter, equilibrium and nonequilibrium dynamics, nonlinear response, time resolved optical spectroscopy

FORMER PRINCIPAL INVESTIGATORS

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Maria Hermanns

C02

 

theory of condensed matter,

strongly correlated systems,

quantum spin liquids, entanglement, fractional quantum Hall effect

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Fan Yang

A04

 

exp.condensed matter physics,
topological materials,
transport measurements,
nano-device fabrication

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Ralf Bulla

C03

 

theory of condensed matter,

quantum phase transitions,

quantum impurity physics,

renormalization group methods

© Simon Wegener

PROJECTS

Project Area A

Materials – preparation and characterization

A01 (Grüneis / Lindfors-Vrejoiu / Michely)

Electronic correlations and spin-orbit coupling in 2D layers and at interfaces

 

A02 (Becker-Bohatý / Braden / Lorenz)

Crystal growth and design of materials

 

A04 (Ando / Taskin)

Topological matter

Project Area B

Physical properties

B01 (Ando / Breunig / Lorenz)

Transport and thermodynamics

 

B02 (Grüninger / Hemberger)

From mHz to PHz: Broadband dielectric and optical spectroscopy
of quantum matter

 

B03 (Grüninger / van Loosdrecht)

Inelastic photon scattering in spin-orbit-coupled matter

 

B04 (Braden)

Dynamics and correlations studied by neutron scattering

 

B05 (van Loosdrecht / Wang)

Optically driven matter

 

B06 (Ando / Brede / Michely )

Scanning tunneling spectroscopy

© Simon Wegener

Participating institutes

 

CONTACT

Prof. Dr. Achim Rosch

II. Physikalisches Institut

Universität zu Köln

Zülpicher Str. 77

50937 Köln

Tel: +49 221 470 4994

rosch@thp.uni-koeln.de

Speaker

Clara Berthet

II. Physikalisches Institut

Universität zu Köln

Zülpicher Str. 77

50937 Köln

Tel.: +49 221470 -2106 or -6998

berthet@ph2.uni-koeln.de

Administrative coordinator

Dr. Thomas Koethe

II. Physikalisches Institut

Universität zu Köln

Zülpicher Str. 77

50937 Köln

Tel: +49 221 470 3659

koethe@ph2.uni-koeln.de

Scientific coordinator

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