Soft Modes, Localization, and Two-Level Systems in Spin Glasses

被引：51

作者：

Baity-Jesi, M. ^{[1
,2
,3
]}

Martin-Mayor, V. ^{[1
,3
]}

Parisi, G. ^{[4
,5
]}

Perez-Gaviro, S. ^{[3
,6
]}

机构：

[1] Univ Complutense, Dept Fis Teor 1, E-28040 Madrid, Spain

[2] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[3] Inst Biocomp & Fis Sistemas Complejos BIFI, Zaragoza 50009, Spain

[4] Univ Roma La Sapienza, Soft & Living Matter Lab, NANOTEC CNR, Dipartimento Fis, I-00185 Rome, Italy

[5] Univ Roma La Sapienza, Ist Nazl Fis Nucl, I-00185 Rome, Italy

[6] Ctr Univ Def, Zaragoza 50090, Spain

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 26期

基金：

欧洲研究理事会;

关键词：

DYNAMIC CORRELATIONS; TEMPERATURE; EXCITATIONS;

D O I：

10.1103/PhysRevLett.115.267205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In the three-dimensional Heisenberg spin glass in a random field, we study the properties of the inherent structures that are obtained by an instantaneous cooling from infinite temperature. For a not too large field the density of states g(omega) develops localized soft plastic modes and reaches zero as omega(4) (for large fields a gap appears). When we perturb the system adding a force along the softest mode, one reaches very similar minima of the energy, separated by small barriers, that appear to be good candidates for classical two-level systems.

引用

页数：6

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