# Pair-fluctuation-induced pseudogap in the normal phase of the two-dimensional attractive Hubbard model at weak coupling

## Abstract

One-particle spectral properties in the normal phase of the two-dimensional attractive Hubbard model are investigated in the weak-coupling regime using the non-self-consistent T-matrix approximation. The corresponding equations are evaluated numerically directly on the real-frequency axis. For temperatures sufficiently close to the superconducting transition temperature, a pseudogap in the one-particle spectral function is observed, which can be assigned to the increasing importance of pair fluctuations.

- Authors:

- Publication Date:

- Sponsoring Org.:
- (US)

- OSTI Identifier:
- 40203505

- Resource Type:
- Journal Article

- Journal Name:
- Physical Review B

- Additional Journal Information:
- Journal Volume: 63; Journal Issue: 22; Other Information: DOI: 10.1103/PhysRevB.63.224509; Othernumber: PRBMDO000063000022224509000001; 049122PRB; PBD: 1 Jun 2001; Journal ID: ISSN 0163-1829

- Publisher:
- The American Physical Society

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; FLUCTUATIONS; HUBBARD MODEL; S MATRIX; SPECTRAL FUNCTIONS; TRANSITION TEMPERATURE

### Citation Formats

```
Rohe, Daniel, and Metzner, Walter.
```*Pair-fluctuation-induced pseudogap in the normal phase of the two-dimensional attractive Hubbard model at weak coupling*. United States: N. p., 2001.
Web. doi:10.1103/PhysRevB.63.224509.

```
Rohe, Daniel, & Metzner, Walter.
```*Pair-fluctuation-induced pseudogap in the normal phase of the two-dimensional attractive Hubbard model at weak coupling*. United States. doi:10.1103/PhysRevB.63.224509.

```
Rohe, Daniel, and Metzner, Walter. Fri .
"Pair-fluctuation-induced pseudogap in the normal phase of the two-dimensional attractive Hubbard model at weak coupling". United States. doi:10.1103/PhysRevB.63.224509.
```

```
@article{osti_40203505,
```

title = {Pair-fluctuation-induced pseudogap in the normal phase of the two-dimensional attractive Hubbard model at weak coupling},

author = {Rohe, Daniel and Metzner, Walter},

abstractNote = {One-particle spectral properties in the normal phase of the two-dimensional attractive Hubbard model are investigated in the weak-coupling regime using the non-self-consistent T-matrix approximation. The corresponding equations are evaluated numerically directly on the real-frequency axis. For temperatures sufficiently close to the superconducting transition temperature, a pseudogap in the one-particle spectral function is observed, which can be assigned to the increasing importance of pair fluctuations.},

doi = {10.1103/PhysRevB.63.224509},

journal = {Physical Review B},

issn = {0163-1829},

number = 22,

volume = 63,

place = {United States},

year = {2001},

month = {6}

}

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