### Abstract

We investigate the Raman spectra in the geometry where both incident and scattered photon polarizations are parallel to the (Formula presented) direction, for a plane-chain bilayer coupled via a single-particle tunneling (Formula presented) The Raman vertex is derived in the tight-binding limit and in the absence of Coulomb screening the Raman intensity can be separated into intraband (Formula presented) and interband (Formula presented) transitions. In the small-(Formula presented) limit appropriate for underdoped samples, the interband part dominates and a pseudogap will appear as it does in the conductivity. Coulomb interactions bring in a two-particle coupling and result in the breakdown of intra- and interband separation. Nevertheless, when (Formula presented) is small, the Coulomb screening (Formula presented) has little effect on the intensity to which the unscreened interband transitions contribute most. In general, the total Raman spectra are strongly dependent on the magnitude of (Formula presented).

Original language | English |
---|---|

Pages (from-to) | 6327-6334 |

Number of pages | 8 |

Journal | Physical Review B - Condensed Matter and Materials Physics |

Volume | 56 |

Issue number | 10 |

DOIs | |

Publication status | Published - 1997 Jan 1 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

### Cite this

*Physical Review B - Condensed Matter and Materials Physics*,

*56*(10), 6327-6334. https://doi.org/10.1103/PhysRevB.56.6327

**Axis Raman spectra of a normal plane-chain bilayer cuprate and the pseudogap.** / Wu, Wen-Chin; Carbotte, J.

Research output: Contribution to journal › Article

*Physical Review B - Condensed Matter and Materials Physics*, vol. 56, no. 10, pp. 6327-6334. https://doi.org/10.1103/PhysRevB.56.6327

}

TY - JOUR

T1 - Axis Raman spectra of a normal plane-chain bilayer cuprate and the pseudogap

AU - Wu, Wen-Chin

AU - Carbotte, J.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - We investigate the Raman spectra in the geometry where both incident and scattered photon polarizations are parallel to the (Formula presented) direction, for a plane-chain bilayer coupled via a single-particle tunneling (Formula presented) The Raman vertex is derived in the tight-binding limit and in the absence of Coulomb screening the Raman intensity can be separated into intraband (Formula presented) and interband (Formula presented) transitions. In the small-(Formula presented) limit appropriate for underdoped samples, the interband part dominates and a pseudogap will appear as it does in the conductivity. Coulomb interactions bring in a two-particle coupling and result in the breakdown of intra- and interband separation. Nevertheless, when (Formula presented) is small, the Coulomb screening (Formula presented) has little effect on the intensity to which the unscreened interband transitions contribute most. In general, the total Raman spectra are strongly dependent on the magnitude of (Formula presented).

AB - We investigate the Raman spectra in the geometry where both incident and scattered photon polarizations are parallel to the (Formula presented) direction, for a plane-chain bilayer coupled via a single-particle tunneling (Formula presented) The Raman vertex is derived in the tight-binding limit and in the absence of Coulomb screening the Raman intensity can be separated into intraband (Formula presented) and interband (Formula presented) transitions. In the small-(Formula presented) limit appropriate for underdoped samples, the interband part dominates and a pseudogap will appear as it does in the conductivity. Coulomb interactions bring in a two-particle coupling and result in the breakdown of intra- and interband separation. Nevertheless, when (Formula presented) is small, the Coulomb screening (Formula presented) has little effect on the intensity to which the unscreened interband transitions contribute most. In general, the total Raman spectra are strongly dependent on the magnitude of (Formula presented).

UR - http://www.scopus.com/inward/record.url?scp=0004448598&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0004448598&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.56.6327

DO - 10.1103/PhysRevB.56.6327

M3 - Article

VL - 56

SP - 6327

EP - 6334

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 10

ER -