Equipment


Watch this video for an introduction to our lab:

We use Raman scattering ...

  • for our fundamental research in condensed matter physics:

probing electronic and magnetic excitations of correlated electrons in solids

  • for materials characterization of new materials, biological samples, electronic devices


Our Raman scattering setup is based on ...

T64000 Jobin-Ivon Horiba triple monochtomator spectrometer with CCD LN2 cooled detector

Raman scattering is excited with Ar+ Kr+ ion Coherent laser with excitation lines in the range from 464 nm to 672 nm

We can measure Raman shifts down to 5 cm-1 at temperatures between 400 and 4 K

In micro-Raman measurements we use a laser to probe samples as small as 2 μm in diameter

We can perform automatic mapping of a sample surface

  • Duoscan mapping (shifting the excitation laser) option allows mapping of a surface of 20μm* 20μm with spatial resolution 0.5 μm at temperatures between 400 and 4 K

  • An automatic mapping stage allows mapping of a sample surface 1 cm*1 cm with spatial resolution 2μm at room temperature

Micro-Raman measurements of a few atomic layer thick exfoliated flake of a new material. Laser probe is 2 μm in diameter

Almax-easyLab CryoDAC-ST Diamond Anvil Cell

The cryoDAC-ST has been designed specifically to fit into the continuous flow cryostat Janis ST-500 used for micro-spectroscopy under high pressure (20 GPa). A mixture of methanol and ethanol used as pressure-transmitting medium provides a hydrostatic environment.

Razorbill Instruments CS100 Strain Cell

Raman Spectroscopy under strain provides the opportunity to finely tune a physical system’s geometry and interaction strength. Using the CS100 uniaxial strain cell from Razorbill Instruments provides several advantages.

  • The Piezoelectric stacks can apply large tensile and compressive strains, achieving a maximum displacement of 6um at room temperature and 3um at cryogenic temperatures. In typical samples, this results in uniaxial strains up to 0.2%

  • Large regions of optical access, which allow us to study the inhomogeneity of applied strains and the formation of multiple domains in materials



Low-frequency, high-resolution spectrometer:

The Jobin Yvon U1000 spectrometer uses a double monochromator with a focal length of 1000mm and four continuously-adjustable slits for controlling the amount of light that passes through into each stage. By using a PMT as a single-channel detector, we can achieve a resolution that is limited by the size of the slits rather than pixels on a CCD. With the superior stray light rejection from the increased focal length and four slits in the double monochromator, and the increased resolution, we can observe lower-energy excitations with more clarity than the T64000 setup.