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Magnetism in Correlated Electron Systems
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Magnetism in Correlated Electron Systems. |
| 개인저자 | Ye, Mengxing. |
| 단체저자명 | University of Minnesota. Physics. |
| 발행사항 | [S.l.]: University of Minnesota., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 164 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-05B. Dissertation Abstract International |
| ISBN | 9781687984562 |
| 학위논문주기 | Thesis (Ph.D.)--University of Minnesota, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
Advisor: Chubukov, Andrey V. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | This dissertation covers several aspects of magnetism in correlated electron systems. The rapid progress in understanding the origins and consequences of emergent quantum phenomena in correlated electron systems is pushed by the advances in theoretical developments, quantum material realizations and experiment probes. Magnetism has been found to be a driving force in many examples. We start with analysis of frustrated magnetic systems with localized spins. We first show the phase diagram of the triangular lattice Heisenberg $J_1$-$J_2$ model in a magnetic field, which exhibit a cascade of field induced magnetic phase transitions. We next critically examine the quantized thermal Hall measurement in Kitaev material and emphasize the importance the spin-lattice coupling in the observation of the quantization. We then study the spin-density-wave state in a compensated metal on a triangular lattice in the weak coupling limit, which develops the same ordering pattern as in the localized spin picture. While the system is not sensitive to the frustration as in a localized spin system, the magnetic field triggers a time-reversal-invariant bond order, unique in a compensated metal. Finally, we study the pseudogap physics, which describes the anomalies in the electronic properties of the system in transition between a Mott insulator with magnetic order and a normal metal by varying certain external parameter, such as temperature or the doping level away from half-filling. We analyze within the magnetic precursor scenario, and show that a coplanar magnetic order, which can be realized in the Hubbard model on a triangular lattice, introduces a knob that controls the strength of the pseudogap behavior. We find a transition between normal Fermi liquid like behavior and pseudogap behavior by varying the value of the knob. |
| 일반주제명 | Physics. Condensed matter physics. |
| 언어 | 영어 |
| 바로가기 | 
: 이 자료의 원문은 한국교육학술정보원에서 제공합니다. |
