Fermionic Spin Excitations in Two- and Three-Dimensional Antiferromagnets

被引：30

作者：

Hao, Zhihao ^{[1
]}

Tchernyshyov, Oleg ^{[1
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 18期

关键词：

QUANTUM; LIQUIDS; LATTICE; CHAIN;

D O I：

10.1103/PhysRevLett.103.187203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spin excitations in an ordered Heisenberg magnet are magnons-bosons with spin 1. That may change when frustration and quantum fluctuations suppress the order and restore the spin-rotation symmetry. We show that spin excitations in the S = 1/2 Heisenberg antiferromagnet on a kagome lattice are spinons-fermions with spin 1/2. In the ground state the system can be described as a collection of small, heavy pairs of spinons with spin 0. A magnetic excitation of lowest energy amounts to breaking up a pair into two spinons at a cost of 0.06 J.

引用

页数：4

共 28 条

[1] LARGE-N LIMIT OF THE HEISENBERG-HUBBARD MODEL - IMPLICATIONS FOR HIGH-TC SUPERCONDUCTORS [J].

AFFLECK, I ;

MARSTON, JB .

PHYSICAL REVIEW B, 1988, 37 (07) :3774-3777

[2] RESONATING VALENCE BONDS - NEW KIND OF INSULATOR [J].

ANDERSON, PW .

MATERIALS RESEARCH BULLETIN, 1973, 8 (02) :153-160

[3] FRACTIONAL STATISTICS AND THE QUANTUM HALL-EFFECT [J].

AROVAS, D ;

SCHRIEFFER, JR ;

WILCZEK, F .

PHYSICAL REVIEW LETTERS, 1984, 53 (07) :722-723

[4] Electronic orbital currents and polarization in Mott insulators [J].

Bulaevskii, L. N. ;

Batista, C. D. ;

Mostovoy, M. V. ;

Khomskii, D. I. .

PHYSICAL REVIEW B, 2008, 78 (02)

[5] Quantum kagome antiferromagnet in a magnetic field: Low-lying nonmagnetic excitations versus valence-bond crystal order [J].

Cabra, DC ;

Grynberg, MD ;

Holdsworth, PCW ;

Honecker, A ;

Pujol, P ;

Richter, J ;

Schmalfuss, D ;

Schulenburg, J .

PHYSICAL REVIEW B, 2005, 71 (14)

[6] SPIN LIQUIDS ON THE HUSIMI CACTUS [J].

CHANDRA, P ;

DOUCOT, B .

JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1994, 27 (05) :1541-1556

[7] KAGOME SPIN-1/2 ANTIFERROMAGNETS IN THE HYPERBOLIC PLANE [J].

ELSER, V ;

ZENG, C .

PHYSICAL REVIEW B, 1993, 48 (18) :13647-13653

[8] NUCLEAR ANTIFERROMAGNETISM IN A REGISTERED HE-3 SOLID [J].

ELSER, V .

PHYSICAL REVIEW LETTERS, 1989, 62 (20) :2405-2408

[9]

*EPAPS, EPRLTAO103006947 EPA

[10] WHAT IS THE SPIN OF A SPIN-WAVE [J].

FADDEEV, LD ;

TAKHTAJAN, LA .

PHYSICS LETTERS A, 1981, 85 (6-7) :375-377

← 1 2 3 →