Condensed concepts

In 1994 superconductivity was discovered in strontium ruthenate (Sr2RuO4). This attracted considerable interest because it had a perovskite...

Tony Leggett died last week. The New York Times has a nice obituary. One measure of his influence on me is that more than 20 posts on this ...

They are anisotropic marginal Fermi liquids. A commenter on my recent AI blog post mentioned the following preprint, with a very different p...

Two characteristics of states of matter are associated with them being referred to as quantum. One characteristic is the importance of quant...

About twenty-five years ago I became interested in how the Fermi surface of the metallic state of organic charge-transfer salts could be map...

I was sad to hear last week of the death of John Wilkins . He was a mentor to a whole generation of condensed matter physicists and a genero...

It is that time of year again. I have not made predictions for a few years. For physics this year I predict Experiments for testing Bell ...

An important and fascinating issue in many-body physics is the emergence of new energy scales, particularly scales that are orders of magni...

A definitive experimental signature of the crossover from a Fermi liquid metal to a bad metal is the disappearance of a Drude peak in the op...

One of most interesting new ideas about quantum matter from the last decade is that of a Hund's metal. This is a strongly correlated met...

When is a system "complex"? Even though we have intuition (e.g. complexity is associated with many interacting degrees of freedom...

I learnt today that David Pines died last week. He was a pioneer in quantum many-body theory, applying it not just to solid state physics bu...

It is fun to come up with clever names for new physical phenomena: quark, big bang, Janus , slepton,  chromodynamics, inflation,  squashon, ...

One of the most fundamental and profound concepts in quantum many-body theory is the emergence of low energy scales  that are much smaller t...

There is an interesting preprint Viscosity Bound Violation in Viscoelastic Fermi Liquids   Matthew P. Gochan, Hua Li, Kevin S. Bedell Th...

A central concept of quantum-many body theory is that of coherent quasi-particles. Their key property is a well-defined relationship between...

The past two decades have seen impressive advances in Angle-Resolved PhotoEmission Spectroscopy (ARPES). This technique has played a particu...

In the metallic state of many strongly correlated electron materials, Fermi liquid properties are only observed at relatively low temperatur...

Dynamical Mean-Field Theory (DMFT) has given many insights into the Mott metal-insulator transition in strongly correlated electron material...

In my recent tutorial on bad metals at IISER Pune a student asked me a basic question that I could not answer: "Why is the degenerate ...