Raman Scattering by Superconducting-Gap Excitations and Their Coupling to Charge-Density Waves

Sooryakumar, R.; Klein, Michael W.

doi:10.1103/physrevlett.45.660

Cited by 330 publications

(262 citation statements)

References 14 publications

Supporting

Mentioning

252

Contrasting

Unclassified

Order By: Relevance

“…The authors assign both features to librations of the BEOT-TTF molecule. After transforming o-(BEOT -TTF)zI3 into superconducting ot-(BEOT -TTFhl3 by annealing the crystal several days at around 80°C, these modes disappear upon entering the superconducting state at T < Tc = 8.1 K. A very similar behavior was observed in NbSe3, where a COW mode at 30 cm-I vanishes below Tc [42]. In the case of o-(BEDT-TTFhI3' however, the 35 cm-l peak is clearly not a COW mode, It is likely to be a phonon peak but the final assignment remains unclear.…”

Section: Introductionsupporting

confidence: 55%

Field and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3

et al. 1994

View full text Add to dashboard Cite

Abstract. -The title compound undergoes a metal-insulator phase transition of unknown origin at TMI = 135 K. We studied the electrodynamic response of Q-(BEDT-TTFhh in a wide range of frequency, covering microwave and millimeter wave frequencies as weIl as the optical spectral range, and found a frequency dependent conductivity up to 1000 cm-1 in the low temperature phase. This is accompanied be a non-linear transport with a smooth onset at about 10 V fcm. Our X-ray studies show no indication of superstructure reflections and clearly rule out the formation of a charge density wave ground state. The lack of a temperature dependence in the millimeter wave conductivity between 20 K and 100 K makes hopping transport unlikely.

show abstract

Section: Introductionsupporting

confidence: 55%

Field and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3

et al. 1994

View full text Add to dashboard Cite

show abstract

“…A similar weakening of a low frequency "phonon" mode in the superconducting state was observed by Sooryakumar and Klein in NbSe2 [23], using Ramanspectroscopy. The "phonon" is in fact a CDW mode at a frequency of about 30 cm-1.…”

Section: Discussionmentioning

confidence: 51%

Resonant Raman scattering from superconducting single crystals of (BEDT-TTF)2I3

Pokhodnia

Graja

Weger

et al. 1993

Z. Physik B - Condensed Matter

View full text Add to dashboard Cite

show abstract

“…Recently, this type of collective mode has attracted much attention thanks to experimental observations in various condensed-matter and quantum-gas systems, such as superconductors NbSe 2 [3][4][5] and Nb 1−x Ti x N [6][7][8][9], quantum antiferromagnets TlCuCl 3 [10,11] and KCuCl 3 [12], charge-density-wave materials K 0.3 MoO 3 [13,14] and TbTe 3 [15,16], superfluid 3 He B-phase [17,18], and superfluid Bose gases in optical lattices [19,20].…”

Section: Introductionmentioning

confidence: 99%

Localized Higgs modes of superfluid Bose gases in optical lattices: A Gutzwiller mean-field study

Danshita

Tsuchiya

2017

Phys. Rev. A

View full text Add to dashboard Cite

We study effects of a potential barrier on collective modes of superfluid Bose gases in optical lattices. We assume that the barrier is created by local suppression of the hopping amplitude. When the system is in a close vicinity of the Mott transition at commensurate fillings, where an approximate particle-hole symmetry emerges, there exist bound states of Higgs amplitude mode that are localized around the barrier. By applying the Gutzwiller mean-field approximation to the Bose-Hubbard model, we analyze properties of normal modes of the system with a special focus on the Higgs bound states. We show that when the system becomes away from the Mott transition point, the Higgs bound states turn into quasi-bound states due to inevitable breaking of the particlehole symmetry. We use a stabilization method to compute the resonance energy and line width of the quasi-bound states. We compare the results obtained by the Gutzwiller approach with those by the Ginzburg-Landau theory. We find that the Higgs bound states survive even in a parameter region far from the Mott transition, where the Ginzburg-Landau theory fails.

show abstract

Raman Scattering by Superconducting-Gap Excitations and Their Coupling to Charge-Density Waves

Cited by 330 publications

References 14 publications

Field and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3

Field and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3

Resonant Raman scattering from superconducting single crystals of (BEDT-TTF)2I3

Localized Higgs modes of superfluid Bose gases in optical lattices: A Gutzwiller mean-field study

Contact Info

Product

Resources

About