Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 1603 |
| Fachzeitschrift | Nature Communications |
| Jahrgang | 11 |
| Ausgabenummer | 1 |
| Publikationsstatus | Veröffentlicht - 1 Dez. 2020 |
| Extern publiziert | Ja |
Abstract
The pure Kitaev honeycomb model harbors a quantum spin liquid in zero magnetic fields, while applying finite magnetic fields induces a topological spin liquid with non-Abelian anyonic excitations. This latter phase has been much sought after in Kitaev candidate materials, such as α-RuCl3. Currently, two competing scenarios exist for the intermediate field phase of this compound (B = 7 − 10 T), based on experimental as well as theoretical results: (i) conventional multiparticle magnetic excitations of integer quantum number vs. (ii) Majorana fermionic excitations of possibly non-Abelian nature with a fractional quantum number. To discriminate between these scenarios a detailed investigation of excitations over a wide field-temperature phase diagram is essential. Here, we present Raman spectroscopic data revealing low-energy quasiparticles emerging out of a continuum of fractionalized excitations at intermediate fields, which are contrasted by conventional spin-wave excitations. The temperature evolution of these quasiparticles suggests the formation of bound states out of fractionalized excitations.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Allgemeine Chemie
- Biochemie, Genetik und Molekularbiologie (insg.)
- Allgemeine Biochemie, Genetik und Molekularbiologie
- Physik und Astronomie (insg.)
- Allgemeine Physik und Astronomie
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in: Nature Communications, Jahrgang 11, Nr. 1, 1603, 01.12.2020.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Magnon bound states versus anyonic Majorana excitations in the Kitaev honeycomb magnet α-RuCl3
AU - Wulferding, Dirk
AU - Choi, Youngsu
AU - Do, Seung Hwan
AU - Lee, Chan Hyeon
AU - Lemmens, Peter
AU - Faugeras, Clément
AU - Gallais, Yann
AU - Choi, Kwang Yong
N1 - Funding information: We acknowledge important discussions with Natalia Perkins, Yuji Matsuda, and Stephen Nagler. Part of this work was performed at the LNCMI, a member of the European Magnetic Field Laboratory (EMFL). This work was supported by “Niedersächsisches Vorab” through the “Quantum-and Nano-Metrology (QUANOMET)” initiative within the project NL-4, DFG-Le967-16, and the Excellence Cluster DFG-EXC 2123 Quantum Frontiers. The work at CAU was supported by the National Research Foundation (NRF) of Korea (Grant no. 2020R1A2C3012367).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - The pure Kitaev honeycomb model harbors a quantum spin liquid in zero magnetic fields, while applying finite magnetic fields induces a topological spin liquid with non-Abelian anyonic excitations. This latter phase has been much sought after in Kitaev candidate materials, such as α-RuCl3. Currently, two competing scenarios exist for the intermediate field phase of this compound (B = 7 − 10 T), based on experimental as well as theoretical results: (i) conventional multiparticle magnetic excitations of integer quantum number vs. (ii) Majorana fermionic excitations of possibly non-Abelian nature with a fractional quantum number. To discriminate between these scenarios a detailed investigation of excitations over a wide field-temperature phase diagram is essential. Here, we present Raman spectroscopic data revealing low-energy quasiparticles emerging out of a continuum of fractionalized excitations at intermediate fields, which are contrasted by conventional spin-wave excitations. The temperature evolution of these quasiparticles suggests the formation of bound states out of fractionalized excitations.
AB - The pure Kitaev honeycomb model harbors a quantum spin liquid in zero magnetic fields, while applying finite magnetic fields induces a topological spin liquid with non-Abelian anyonic excitations. This latter phase has been much sought after in Kitaev candidate materials, such as α-RuCl3. Currently, two competing scenarios exist for the intermediate field phase of this compound (B = 7 − 10 T), based on experimental as well as theoretical results: (i) conventional multiparticle magnetic excitations of integer quantum number vs. (ii) Majorana fermionic excitations of possibly non-Abelian nature with a fractional quantum number. To discriminate between these scenarios a detailed investigation of excitations over a wide field-temperature phase diagram is essential. Here, we present Raman spectroscopic data revealing low-energy quasiparticles emerging out of a continuum of fractionalized excitations at intermediate fields, which are contrasted by conventional spin-wave excitations. The temperature evolution of these quasiparticles suggests the formation of bound states out of fractionalized excitations.
UR - http://www.scopus.com/inward/record.url?scp=85082779464&partnerID=8YFLogxK
U2 - 10.1038/s41467-020-15370-1
DO - 10.1038/s41467-020-15370-1
M3 - Article
C2 - 32231215
AN - SCOPUS:85082779464
VL - 11
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 1603
ER -