Abstract
Frustrated quantum magnets are a central theme in condensed matter physics due to the richness of their phase diagrams. They support a panoply of phases including various ordered states and topological phases. Yet, this problem has defied a solution for a long time due to the lack of controlled approximations which make it difficult to distinguish between competing phases. Here we report the discovery of a special quantum macroscopically degenerate point in the XXZ model on the spin-1/2 kagome quantum antiferromagnet for the ratio of Ising to antiferromagnetic transverse coupling Jz/J=-1/2. This point is proximate to many competing phases explaining the source of the complexity of the phase diagram. We identify five phases near this point including both spin-liquid and broken-symmetry phases and give evidence that the kagome Heisenberg antiferromagnet is close to a transition between two phases.
| Original language | English (US) |
|---|---|
| Article number | 117202 |
| Journal | Physical review letters |
| Volume | 120 |
| Issue number | 11 |
| DOIs | |
| State | Published - Mar 13 2018 |
Fingerprint
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Macroscopically Degenerate Exactly Solvable Point in the Spin- 1/2 Kagome Quantum Antiferromagnet. / Changlani, Hitesh J.; Kochkov, Dmitrii; Kumar, Krishna; Clark, Bryan K; Fradkin, Eduardo H.
In: Physical review letters, Vol. 120, No. 11, 117202, 13.03.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Macroscopically Degenerate Exactly Solvable Point in the Spin- 1/2 Kagome Quantum Antiferromagnet
AU - Changlani, Hitesh J.
AU - Kochkov, Dmitrii
AU - Kumar, Krishna
AU - Clark, Bryan K
AU - Fradkin, Eduardo H
PY - 2018/3/13
Y1 - 2018/3/13
N2 - Frustrated quantum magnets are a central theme in condensed matter physics due to the richness of their phase diagrams. They support a panoply of phases including various ordered states and topological phases. Yet, this problem has defied a solution for a long time due to the lack of controlled approximations which make it difficult to distinguish between competing phases. Here we report the discovery of a special quantum macroscopically degenerate point in the XXZ model on the spin-1/2 kagome quantum antiferromagnet for the ratio of Ising to antiferromagnetic transverse coupling Jz/J=-1/2. This point is proximate to many competing phases explaining the source of the complexity of the phase diagram. We identify five phases near this point including both spin-liquid and broken-symmetry phases and give evidence that the kagome Heisenberg antiferromagnet is close to a transition between two phases.
AB - Frustrated quantum magnets are a central theme in condensed matter physics due to the richness of their phase diagrams. They support a panoply of phases including various ordered states and topological phases. Yet, this problem has defied a solution for a long time due to the lack of controlled approximations which make it difficult to distinguish between competing phases. Here we report the discovery of a special quantum macroscopically degenerate point in the XXZ model on the spin-1/2 kagome quantum antiferromagnet for the ratio of Ising to antiferromagnetic transverse coupling Jz/J=-1/2. This point is proximate to many competing phases explaining the source of the complexity of the phase diagram. We identify five phases near this point including both spin-liquid and broken-symmetry phases and give evidence that the kagome Heisenberg antiferromagnet is close to a transition between two phases.
UR - http://www.scopus.com/inward/record.url?scp=85044203296&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85044203296&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.120.117202
DO - 10.1103/PhysRevLett.120.117202
M3 - Article
AN - SCOPUS:85044203296
VL - 120
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 11
M1 - 117202
ER -