Solid State Physics Research

Superconductivity, Optics of Nanostructures, Organic Conductors and Semiconductors

Research Topics

  • Fundamental questions such as quantum correlations in tailored matter, quantum phase transitions, superconductivity, Dirac- and Weyl-semimetals
  • Low-energy electrodynamics of correlated electron systems
  • Interplay of charge, spin, orbital and structural degrees of freedom, in particular close to charge and magnetic frustration.
  • Quantum spin liquids and quantum electric dipoles in frustrated geometries
  • Ordering phenomena in low-dimensional organic conductors, in particular charge order and electronic ferroelectricity, charge-order-driven superconductivity.
  • Optical properties of metallic nanostructures.

Learn more about the researh topics in the Publications by PI1 Members

Open Positions for PhD Thesis

Research Methods

Optical Spectroscopy: Ellipsometry (nir, vis uv), Fourier transform infrared spectroscopy, Coherent source THz spectroscopy, Microwave Cavities (GHz), Broadband microwave spectroscopy (MHz, GHz)

Magnetic Techniques: SQUID, ESR spectroscopy

Development of New Techniques:  THz Micro-Spectrometer, Broadband microwave spectrometer

Sample Preparation and Characterization, Surface characterization: LEED, dc resistivity, Crystal growth, Microscopy

Methods Overview

Presentation of Prof. Dr. Martin Dressel

Research Topics in Detail

Molecular solids provide the opportunity to tailor a material with desired properties: by selecting and varying the building blocks and arrangement the targeted functionality can be achieved. Among them organic conductors are ideal model systems to investigate unconventional phenomena emerging from strong electron-electron interactions, including charge-ordered and Mott insulators, quantum spin liquids, unconventional superconductors, Fermi liquids and the effects of low dimensionality, such as the Luttinger liquid. The low energy scales allow us to cover the entire phase diagram with comparably small temperature and pressure scales.

Contact: E. Uykur, M. Dressel

Learn more about Molecular Quantum Materials

Weyl and Dirac semimetals posses three-dimensional linearly dispersing electronic bands with crossings near the Fermi level. The low-energy excitations of these systems (i.e. Weyl or Dirac fermions) are described by relativistic Weyl or Dirac equations, rather than by conventional Schrodinger equation used for parabolic bands. At PI1, we investigate the optical response of Weyl and Dirac semimetals at terahertz and infrared frequencies in order to probe the low-energy dynamics of Weyl and Dirac fermions in solids.

Contact:  S. Roh, A. Pronin 

Directly to "Dirac and Weyl Semimetals"

How can we understand unconventional electronic states such as found in superconductors, quantum-critical metals, or spin systems? We employ optical spectroscopy at low energies, meaning at GHz and THz frequencies and at very low temperatures, to probe charge and spin dynamics in a wide variety of materials. This opens a unique experimental access to the fundamental properties of some of the most fascinating materials physicists can study.

Contact: M. Scheffler

Directly to "Low Energy Electrons in Solids"

The subject of nanoscience is the preparation and investigation of structures well below one micron. The macroscopic properties of materials strongly alter, when the size is significantly reduced. Nanostructures are also very interesting in optics. Especially for metal-dielectric nanostructures with "unit cells" much smaller than the wavelength a large number of unexpected new phenomena are predicted like superlensing and cloaking. It is expected that with these so called Metamaterials new photonic devices with freely tuneable permittivity and permeability can be built. These theoretical approaches rely on the assumption of idealized effective optical parameters.

Contact: N.N.

Directly to "Optics of Metallic Nanostructures"

Martin Dressel
Prof. Dr. rer. nat.

Martin Dressel

Head of Institute

Artem Pronin

Artem Pronin

Optical studies of topological materials

Ece Uykur

Ece Uykur

Hybrid Perovskites

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