Charge density wave soliton liquid

Abstract

We investigate the charge density wave transport in a quasi-one-dimensional conductor, orthorhombic tantalum trisulfide (o-TaS 3 ), by applying a radio-frequency ac voltage. We find a new ac-dc interference spectrum in the differential conductance, which appear on both sides of the zero-bias peak. The frequency and amplitude dependences of the new spectrum do not correspond to those of any usual ac-dc interference spectrum (Shapiro steps). The results suggest that CDW phase dynamics has a hidden degree of freedom. We propose a model in which 2π phase solitons behave as liquid. The origin of the new spectrum is that the solitons are depinned from impurity potentials assisted by an ac field when small dc field is applied. Our results provide a new insight as regards our understanding of an elementary process in CDW dynamics.

Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1T−TaS2

“…The existence of CDW phase solitons -topological phase defects -is a particular form of collective excitation in the CDW condensate and has been confirmed in quasi-1D systems [54][55][56][57]. Recently, there are suggestions that soliton contribution must be rather important for the unconventional transport properties associated with CDW system [58][59][60] In Ref. [35], Krive and Rozhavsky proposed that the phase solitons significantly contribute the dielectric susceptibility.…”

From chiral anomaly to two-fluid hydrodynamics for electronic vortices

“…Eqs. (16)(17)(18) need to be complemented by an equation for the normal density n. Even if the chiral transformation has reduced the task to electrons of a semiconductor with a gap 2Δ subjected to the effective potential V, the detailed description of electrons' kinetics is still a complicated problem taking into account different collisions and scattering mechanism and particularities of (quasi) onedimensionality. In the context of the CDW, the most systematic studies have been performed in series of articles [32 and rfs.…”

Field-induced dielectric response saturation ino-TaS3

“…To the best of our knowledge, the temperature and bias dependent dielectric or conductivity spectra have been reported for K 0.3 MoO 3 1,15,16 and NbSe 3 2,17,18 . For TaS 3 , similar research work is relatively insufficient 1,19,20 , the very recent report is the ac-dc interference spectra investigated by Matsuura et al 12 . Hence, investigating the charge dynamics of TaS 3 system under various electric field would be helpful to elucidate the behavior of the charged condensates.…”

“…Temperature dependent complex dielectric or conductivity spectrum is a powerful method for studying charge dynamics of substances [8][9][10][11][12][13][14] . At a fixed temperature and meanwhile especially under various E established by dc bias, it would be of great interest since the depinned CDW could transport charges collectively or even possibly provide Fröhlich-mode conductivity.…”