Zero-magnon sound in quantum Heisenberg ferromagnets

被引：10

作者：

Goll, Raphal ^{[1
]}

Rueckriegel, Andreas ^{[1
]}

Kopietz, Peter ^{[1
]}

机构：

[1] Goethe Univ Frankfurt, Inst Theoret Phys, Max von Laue Str 1, D-60438 Frankfurt, Germany

来源：

PHYSICAL REVIEW B | 2020年 / 102卷 / 22期

关键词：

LONGITUDINAL DYNAMICAL SUSCEPTIBILITY; RENORMALIZATION-GROUP APPROACH; LOW-TEMPERATURE BEHAVIOR; CORRELATION LENGTH; SPIN FLUCTUATIONS;

D O I：

10.1103/PhysRevB.102.224437

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using a functional renormalization-group approach, we show that at low temperatures and in a certain range of magnetic fields, the longitudinal dynamic structure factor of quantum Heisenberg ferromagnets in dimensions D <= 2 exhibits a well-defined quasiparticle peak with linear dispersion that we identify as zero-magnon sound. In D > 2, the larger phase space available for the decay into transverse spin waves leads only to a broad hump centered at zero frequency whose width scales linearly in momentum.

引用

页数：10

共 37 条

[1] ZERO SOUND AND SPIN FLUCTUATIONS IN LIQUID-HE-3 [J].

ALDRICH, CH ;

PETHICK, CJ ;

PINES, D .

PHYSICAL REVIEW LETTERS, 1976, 37 (13) :845-848

[2]

[Anonymous], 2010, INTRO FUNCTIONAL REN

[3] LONGITUDINAL SPIN DYNAMICS IN THE HEISENBERG ANTIFERROMAGNET: TWO-MAGNON EXCITATIONS [J].

Boliasova, O. O. ;

Krivoruchko, V. N. .

UKRAINIAN JOURNAL OF PHYSICS, 2020, 65 (10) :865-874

[4] LONGITUDINAL SPIN FLUCTUATIONS IN NICKEL [J].

BONI, P ;

MARTINEZ, JL ;

TRANQUADA, JM .

PHYSICAL REVIEW B, 1991, 43 (01) :575-584

[5] DYNAMICAL LONGITUDINAL CORRELATION-FUNCTION OF HEISENBERG MODEL AT LOW-TEMPERATURES [J].

DEWEL, G .

PHYSICA A, 1975, 82 (03) :365-388

[6] DYNAMICAL LONGITUDINAL CORRELATION-FUNCTION OF HEISENBERG MODEL AT LOW-TEMPERATURES .2. HYDRODYNAMIC REGIME [J].

DEWEL, G .

PHYSICA A, 1977, 89 (02) :245-264

[7]

Dupuis N., ARXIV200604853V1

[8] Spin functional renormalization group for quantum Heisenberg ferromagnets: Magnetization and magnon damping in two dimensions [J].

Goll, Raphael ;

Tarasevych, Dmytro ;

Krieg, Jan ;

Kopietz, Peter .

PHYSICAL REVIEW B, 2019, 100 (17)

[9] HYDRODYNAMIC THEORY OF SPIN WAVES [J].

HALPERIN, BI ;

HOHENBER.PC .

PHYSICAL REVIEW, 1969, 188 (02) :898-&

[10] LONGITUDINAL DYNAMICAL SUSCEPTIBILITY OF HEISENBERG FERROMAGNET AT SHORT WAVELENGTHS AND LOW TEMPERATURES [J].

HARRIS, AB .

PHYSICAL REVIEW B, 1971, 3 (09) :3065-&

← 1 2 3 4 →