Light induced dynamics and control of correlated quantum systems : Department of Physics : Universität Hamburg

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About the Collaborative Research Centre SFB 925

The SFB 925 addresses the dynamics of the many – one of the deepest and most challenging problems in modern physics: How does collective behaviour emerge from the interactions of multiple degrees of freedom, especially when the system is driven away from equilibrium? The spectacular advances in photon science with new sources of THz and X-ray radiation, in quantum gas physics and in many-body physics have put us in a unique position to tackle this prob-lem comprehensively: We will go beyond imaging the quantum dynamics and reach out to steer many-body states with light to reach new emerging functionalities.
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a. STS LDOS of Bernal and rhombohedral graphene domains in small-angle twisted double bilayer graphene. The inset shows the atomic stacking for Bernal and rhombohedral graphene. b. STS LDOS map at −20 meV showing the emergence of edge states. An ext

Photo: Carmen Rubio-Verdú

20 January 2021|SFB925

A new natural platform for realizing flat-band quantum phenomena and topological states

Electrons in solids can have only certain energies, called bands. In recent years, it was shown experimentally that the range of energies allowed for electrons can be tuned by twisting two layers of graphene relative to each other. Under appropriate conditions, the range of allowed energies is very narrow, leading to a...

Atomic relaxation lies at the heart of ‘moiré metrology’: the atoms of the two layers move in search of a stable configuration, forming domains separated by domain walls (illustrated on the left). This kind of analysis allows moiré metrology to reach

Photo: Dorri Halbertal

14 January 2021|SFB925

'Moiré metrology' - a new tool to map the interaction between atomically thin layers

When two atomically thin layers of a material are stacked and twisted slightly on top of one another, they can develop radically different properties. They may become superconducting, like famously demonstrated for twisted bilayer graphene (TBL), or even develop magnetic or electronic properties due to the interaction of...

Artistic impression of vibrationally-induced transparency in CuGeO3

Photo: University of Trieste / INSRL

6 January 2021|SFB925

Kicking atoms induces transparency in CuGeO3

All photo-electronic devices work on the basis that the materials inside them absorb, transmit and reflect light. Understanding the photo properties of a specific material at the atomic level not only helps to decide what material to choose for a given application but also opens up ways to control such properties on demand...

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