Quantum phase transition in a two-dimensional Kondo-Heisenberg model: A dynamical Schwinger-boson large- N approach
We generalize the dynamical large-N multichannel Schwinger-boson approach to study the quantum phase transition of a two-dimensional Kondo-Heisenberg model, relevant for heavy electron systems, close to an antiferromagnetic Kondo destruction quantum critical point. By breaking up a Kondo singlet int...
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| Veröffentlicht in: | Physical review. B 2020-09, Vol.102 (11), p.1, Article 115133 |
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| container_title | Physical review. B |
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| creator | Wang, Jiangfan Chang, Yung-Yeh Mou, Chung-Yu Kirchner, Stefan Chung, Chung-Hou |
| description | We generalize the dynamical large-N multichannel Schwinger-boson approach to study the quantum phase transition of a two-dimensional Kondo-Heisenberg model, relevant for heavy electron systems, close to an antiferromagnetic Kondo destruction quantum critical point. By breaking up a Kondo singlet into a charge fermion (holon) and a bosonic spinon, we identify and characterize the quantum phase transition from an antiferromagnetically ordered state to a Kondo-dominated paramagnetic state, and attribute a jump in the holon phase shift to Kondo breakdown. We calculate transport and thermodynamic quantities. The global finite-temperature phase diagram and the critical behavior of various physical observables therein show a close resemblance to experimental observations. |
| doi_str_mv | 10.1103/PhysRevB.102.115133 |
| format | Article |
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| source | APS: American Physical Society E-Journals (Physics) |
| subjects | Antiferromagnetism Critical point Fermions Heisenberg theory Phase diagrams Phase transitions Statistical models Two dimensional models |
| title | Quantum phase transition in a two-dimensional Kondo-Heisenberg model: A dynamical Schwinger-boson large- N approach |
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