Threshold electric field in unconventional density waves

Aspects of unconventional density waves

Recently many people discuss unconventional density waves (i.e. unconventional charge density waves (UCDW) and unconventional spin density waves (USDW)). Unlike in conventional density waves, the quasiparticle spectrum in these systems is gapless. Also these systems remain metallic. Indeed it appears that there are many candidates for UDW. The low temperature phase of α-(BEDT-TTF)2KHg(SCN)4, th...

Recent Advances in Unconventional Density Waves

Unconventional density wave (UDW) has been speculated as a possible electronic ground state in excitonic insulator in 1968. Recent surge of interest in UDW is partly due to the proposal that the pseudogap phase in high Tc cuprate superconductors is d-wave density wave (d-DW). Here we review our recent works on UDW within the framework of mean field theory. In particular we have shown that many ...

Collective modes in unconventional density waves

– We have investigated the collective modes of unconventional charge and spin density waves (UCDW, USDW) in quasi-one dimensional systems in random phase approximation. The density correlator regains its normal state form due to the phase degree of freedom of the condensate. The possible effect of impurities is also discussed. From this, the currentcurrent correlation function is evaluated thro...

Unconventional Density Waves in Organic Conductors and in Superconductors

1 Department of Physics and Astronomy, University of Southern California, Los Angeles CA 90089-0484, USA and Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, D-01187, Dresden, Germany [email protected] 2 Department of Physics, Budapest University of Technology and Economics, H-1521 Budapest, Hungary [email protected] 3 Department of Physics, Budapest University of T...

Unconventional spin-density waves in dipolar Fermi gases