A Magnetic-Field-Free Exciton Condensate

Quark Condensate in a Magnetic Field

We study the dependence of quark condensate Σ on an external magnetic field. For weak fields, it rises linearly: Σ(H) = Σ(0)

Field-induced magnetic instability within a superconducting condensate

The application of magnetic fields, chemical substitution, or hydrostatic pressure to strongly correlated electron materials can stabilize electronic phases with different organizational principles. We present evidence for a field-induced quantum phase transition, in superconducting Nd0.05Ce0.95CoIn5, that separates two antiferromagnetic phases with identical magnetic symmetry. At zero field, w...

Reconstruction of Solar Coronal Linear Force-Free Magnetic Field

Exciton condensate in semiconductor quantum well structures.

We propose that the exciton condensate may form in a well-controlled way in appropriately arranged semiconductor quantum well structures. The mean-field theory of Keldysh and Kopaev, exact in both the high density and the low density limits, is solved numerically to illustrate our proposal. The electron-hole pairing gap and the excitation spectrum of the exciton condensate are obtained. The ene...

Josephson Currents in the Bilayer Exciton Condensate

Reducing the dimension of an electronic charge system from three to two leads to the emergence of intriguing phenomena like the integer and fractional quantum Hall effect (QHE) or special forms of superconductivity . Two-dimensional electron gases (2DEG) in GaAs quantum wells embedded in AlGaAs buffer layers are unique because of their extreme high purity characterized by electron and hole mobi...