Electronic Liquid Crystals
Novel Phases of Electrons in Two Dimensions

Competing interactions

Ferrofluid in a Hele-Shaw cell

Results courtesy of Ken Cooper

Modulated phases

Liquid crystals

Outline

Two-dimensional electron gas (2DEG)

The quantum Hall effect

Charge density wave in 2D?

Hartree-Fock treatment of CDW

Experimental evidence

Experimental details

A charge density wave?

The quantum Hall smectic

Order in two dimensions

The quantum Hall nematic

Nematic to isotropic transition

Quantum theory of the QHN

Theoretical digression…

Predictions

New directions

Summary