Electronic Raman Spectroscopy in a Nut Shell (I)

Electronic Raman Spectroscopy in a Nut Shell (I)

Yu HeSC MeetingOct 10, 2013

• Raman and History

• Experimental Setup• Geometry in Raman

• Position Raman among other Techniques

• Raman in Superconducting Materials• Mode coupling• SC Gap

Electronic Raman Spectroscopy in a Nut Shell (I)

• Raman and History

• Experimental Setup• Geometry in Raman

• Position Raman among other Techniques

• Raman in Superconducting Materials• Mode coupling• SC Gap

Raman at First Glance

Very Frist Raman by Raman

Milestones to Modern Raman

Electronic Raman Spectroscopy

Resonant Inelastic X-ray Scattering

Molecules (gas and liquid)

Solid (electronic)

From Molecules to Solid

Electronic Raman Spectroscopy in a Nut Shell (I)

Yu HeSC MeetingOct 10, 2013

• Raman and History

• Experimental Setup• Geometry in Raman

• Position Raman among other Techniques

• Raman in Superconducting Materials• Mode coupling• SC Gap

Backscattering Raman

electro-optic modulator (EOM)

Geometry in Raman

Electronic Raman Spectroscopy in a Nut Shell (I)

Yu HeSC MeetingOct 10, 2013

• Raman and History

• Experimental Setup• Geometry in Raman

• Position Raman among other Techniques

• Raman in Superconducting Materials• Mode coupling• SC Gap

e-ph: Migdal

Coulomb: FL, MFL

e-magnon

Single Particle vs Two Particles

Electronic Conductivity

IR Spectroscopy

Electronic Raman Spectroscopy in a Nut Shell (I)

Yu HeSC MeetingOct 10, 2013

• Raman and History

• Experimental Setup• Geometry in Raman

• Position Raman among other Techniques

• Raman in (Superconducting) Materials• Mode coupling• SC Gap

Start from single metal? Not so easy!

• Strong screening – small interaction volume

• Parabolic dispersion and spherical FS – further reduce cross section

Nb3Sn

40K

1.8K

1.8K

1.8K

V3Si

‘HighTc’ Convenional SC

Tc ~ 7.2K, Tcdw ~33K, Hc2 ~42kG

Competition and Mode Coupling

Mode description

Highc SC

Highc SC

Highc SCBi2212

Highc SC

M. Le Tacon et al., Nat. Phys. 2, 537 (2006)

Highc SC

Highc SC

Highc SC

Bi2212

0.15 0.20 0.22

Highc SC

Highc SC

Two magnon excitations

Highc SC

FT- Raman RIXS

The END