Observation of Nonconventional Spin Waves in Composite-Fermion Ferromagnets

被引：21

作者：

Wurstbauer, U. ^{[1
]}

Majumder, D. ^{[2
]}

Mandal, S. S. ^{[2
]}

Dujovne, I. ^{[3
]}

Rhone, T. D. ^{[1
]}

Dennis, B. S. ^{[4
]}

Rigosi, A. F. ^{[1
]}

Jain, J. K. ^{[5
]}

Pinczuk, A. ^{[1
,6
]}

West, K. W. ^{[7
]}

Pfeiffer, L. N. ^{[7
]}

机构：

[1] Columbia Univ, Dept Phys, New York, NY 10027 USA

[2] Indian Assoc Cultivat Sci, Dept Theoret Phys, Kolkata 700032, India

[3] Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA

[4] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[5] Penn State Univ, Dept Phys, Davey Lab 104, University Pk, PA 16802 USA

[6] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA

[7] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 06期

基金：

美国国家科学基金会;

关键词：

COLLECTIVE EXCITATIONS; QUANTUM; POLARIZATION; TRANSITION;

D O I：

10.1103/PhysRevLett.107.066804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We find unexpected low energy excitations of fully spin-polarized composite-fermion ferromagnets in the fractional quantum Hall liquid, resulting from a complex interplay between a topological order manifesting through new energy levels and a magnetic order due to spin polarization. The lowest energy modes, which involve spin reversal, are remarkable in displaying unconventional negative dispersion at small momenta followed by a deep roton minimum at larger momenta. This behavior results from a nontrivial mixing of spin-wave and spin-flip modes creating a spin-flip excitonic state of composite-fermion particle-hole pairs. The striking properties of spin-flip excitons imply highly tunable mode couplings that enable fine control of topological states of itinerant two-dimensional ferromagnets.

引用

页数：4

共 21 条

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