ZQE dev: home

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description => '<div class="ce-bodytext">Welcome to the research pages of the Chair of To
pology of Correlated Systems (E51), led by Prof. Dr. Christian Pfleiderer. O
ur research is centred on topological and strongly correlated phenomena in q
uantum materials – from the discovery of magnetic skyrmions and topological
band structures to quantum phase transitions and non-Fermi liquid behaviour.
We grow ultrapure single crystals of our own design and characterise them w
ith transport, thermodynamic, and spectroscopic techniques under extreme con
ditions of temperature, pressure, and magnetic field. Our chair is hosted in
the Center for Quantum Engineering (ZQE), of which Prof. Pfleiderer serves
as executive director, and is part of the Munich Center for Quantum Science
and Technology (MCQST).</div>' (793 chars)

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descriptionresearch => 'A second major thrust concerns the topology of electronic band structures
in quantum materials. We have demonstrated symmetry-enforced topological no
dal planes at the Fermi surface of MnSi [4] and mapped net- works of no
dal planes, multifold degeneracies, and Weyl points in the chiral topologica
l semimetal CoSi [5, 6]. In CoSi we further discovered a new generic phenome
non: quantum oscillations of the quasiparticle lifetime per- sisting to
unusually high temperatures above 50 K [7] – revealing a fundamentally new
mechanism for quantum oscillations in metals.1 We also investigate quantum p
hase transitions and non-Fermi liquid behaviour. Our early work revealed par
tial order in the non-Fermi-liquid phase of MnSi under pressure [8], a landm
ark result in quantum criticality. We have since discovered the emergence of
mesoscale quantum phase transitions in a ferromagnet [9] and study mat
erials hosting unconventional superconductivity and competing forms of elect
ronic order. Advanced spectroscopic methods – including resonant elastic X-r
ay scattering (REXS) [10] and neutron scattering – provide complementary acc
ess to magnetic and electronic order across all of these research directions
.' (1221 chars)

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description => 'Welcome to the research pages of the Chair of Experimental Physics of Fun
ctional Spin-Systems, led by Prof. Dr. Christian H. Back. Our research focus
es on fundamental magnetic properties and magnetisation dynamics in hybrid m
aterials comprising ultrathin magnetic layers. We combine high-resolution ma
gnetic microscopy techniques with microwave excitation and detection to expl
ore magnetisation dynamics, the propagation of spin waves, and the efficienc
y of charge-to-spin current conversion in a wide range of material systems –
including magnetic 2D materials and topological materials. Our work is embe
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descriptionresearch => 'Our research covers a broad range of topics in modern magnetism and spint
ronics. A central theme is the study of spin waves and magnonics: we use tim
e-resolved magneto-optical Kerr microscopy to image spin-wave propagation –
for instance in ring-shaped magnonic waveguides<a class="sdfootnoteanc" href
="t3://page?uid=current#sdfootnote1sym">1</a> – and develop novel
readout schemes based on nitrogen-vacancy centres in diamond<a class="sdfoo
tnoteanc" href="t3://page?uid=current#sdfootnote2sym">2</a>. We f
urthermore investigate complex spin structures in topological materials, stu
dying magnetic skyrmions in B20 silicides and Cu2OSeO3
as model systems for topologically non-trivial spin textures<a class="sdfoo
tnoteanc" href="t3://page?uid=current#sdfootnote3sym">3</a>, as w
ell as hybrid structures that combine three-dimensional topological insulato
rs with ultrathin magnetic layers for efficient spin-to-charge conversion<a
class="sdfootnoteanc" href="t3://page?uid=current#sdfootnote4sym">4</su
p></a>. In the field of spinorbitronics, we explore spin-orbit torqu
e driven switching on sub-nanosecond timescales<a class="sdfootnoteanc" href
="t3://page?uid=current#sdfootnote5sym">5</a>. A highlight of our
recent work, published in Nature in 2024, was the demonstration that
an in-plane charge current in Pt can modify the magnetic energy landscape o
f an adjacent Fe layer – a direct signature of magnetism control by the flow
of angular momentum<a class="sdfootnoteanc" href="t3://page?uid=current#sdf
ootnote6sym">6</a>. Magnetisation dynamics on picosecond timescal
es, including subtle effects like emerging anisotropic Gilbert damping and i
nterfacial tuning of damping parameters<a class="sdfootnoteanc" href="t3://p
age?uid=current#sdfootnote7sym">7</a>, remain at the core of our
experimental programme.' (1927 chars)

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ed by Prof. Dr. Eva Maria Weig. Our research focuses on the experimental inv
estigation of nanomechanical systems – freely suspended, top-down fabricated
nanostructures that vibrate like miniature guitar strings. These nanostring
s, typically 30–50 micrometres long and less than 100 nanometres wide, conta
in roughly one billion atoms and operate at the boundary between classical a
nd quantum mechanics. Our chair is part of the Center for Quantum Engineerin
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lopment to quantum-enabled sensing. A central pillar is the fabrication and
characterisation of high-Q nanomechanical string resonators: By engineering
the material composition we push intrinsic mechanical quality factors to ext
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ic 4H-SiC resonators1. By incorporating intrinsic tensile stress, the qualit
y factor is further enhanced via dissipation dilution. Our portfolio of crys
talline resonator materials includes InGaP nanostrings, GaAs nanopillar
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oelectricity, dissipation dilution from high intrinsic stress, or compatibil
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sduction scheme4 and demonstrated microwave cavity-enhanced transduction at
room temperature5, providing a versatile interface between mechanical motion
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s spurious modes and improve qubit coherence1,2, providing a scal
able platform for multi-qubit systems. Machine Learning for Qubit
Readout. We apply deep neural networks and hardware-efficient ML archit
ectures to discriminate multiplexed superconducting-qubit states, achieving
improved readout fidelity compared to conventional methods3,4. Th
ese techniques enable faster and more accurate qubit state classification at
scale. Quantum Photonics & Single-Photon Sources. Buildi
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ght quantum emitters in aluminum nitride integrated photonics5 an
d tunable single-photon emitters based on atomic defects in hexagonal boron
nitride6. Quantum Sensing Integration. Through the
BMBF-funded EQuIPS project, we develop sensing capabilities for quantum pro
cessor stabilisation, integrating quantum sensing with quantum computing har
dware to enable real-time characterisation and error correction.' (1284 chars)

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ns from quantum ladder systems3. Recently, we have unlocked multi
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hoton interfaces are essential for building modular, distributed quantum net
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b>2 monolayers, Janus transition metal dichalcogenides, and moiré exci
tons in MoSe2 homobilayers, exploring new material platforms for
photonic quantum technologies.' (1706 chars)

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ZQE dev: home

Claim, message or the like

Our Mission

The TUM Center for Quantum Engineering (ZQE) is a Central Scientific Institution of the Technical University of Munich. With a primary focus on bridging the gap between fundamental quantum phenomena and practical engineering applications necessary for their commercialization, ZQE plays a pivotal role in advancing quantum research and development.

Impressions

What we do

Operating as an interdisciplinary hub, ZQE fosters collaboration among experts from various fields including physics, electrical engineering, chemistry, mathematics, and computer sciences. Harnessing the collective expertise of these diverse disciplines, ZQE enables discovery and innovation in the realm of quantum engineering. Through its commitment to excellence and its multidisciplinary approach, ZQE positions itself at the forefront of quantum research, driving advancements that will shape the future of technology and revolutionize various industries.