DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Jong-Jean | - |
dc.contributor.advisor | 김종진 | - |
dc.contributor.author | Kim, Do-Hyun | - |
dc.contributor.author | 김도현 | - |
dc.date.accessioned | 2011-12-14T07:23:29Z | - |
dc.date.available | 2011-12-14T07:23:29Z | - |
dc.date.issued | 2003 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=180940&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/47315 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 물리학과, 2003.2, [ x, 63 p. ] | - |
dc.description.abstract | In this paper we investigate for the infinite-range Ising spin glass model (i.e., Sherrington-Kirkpatrick (SK) model) with a transverse field under static approximation by using the imaginary-time replica formalism. From the investigations we show three important results: First, we show that a replica-symmetric quantum spin glass phase is stable in most of the area of spin glass phase in the temperature-transverse field phase diagram. This confirms the existence of stable replica-symmetric spin glass phase under static approximation, which is contrary to some previous results derived without the static approximation where the replica-symmetric solution is always unstable in the whole spin glass phase. Secondly, we show our theoretical result of nonlinear susceptibility $X_nl$ which conforms to the experimental result of nonlinear susceptibility measurement by Wu et al. [Phys. Rev. Lett. 71, 1919 (1993)] in a quantum spin glass $LiHo_xY_{1-x}F_4$. Thirdly, in classical (SK) spin glass system, we confirm the anomaly in the second temperature derivative of $C_H/T$ near the glass transition temperature $T_g$, associated possibly with the field-dependent variation of entropy in the spin glass transition, which agrees with the previous experimental observation in a classical spin glass system CuMn by Fogle et al. [Phys. Rev. Lett. 50, 1815 (1983)]. We also show that this anomaly is suppressed by the nonzero transverse field of quantum spin glass system, by which we can check for the quantum tunneling competing against spin freezing. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | quantum spin glass | - |
dc.subject | spin glass | - |
dc.subject | transverse Ising model | - |
dc.subject | 횡적 Ising 모델 | - |
dc.subject | 양자 스핀 유리 | - |
dc.subject | 스핀 유리 | - |
dc.title | Transverse ising spin glass model for quantum spin glass system | - |
dc.title.alternative | 양자 스핀 유리계를 위한 횡적 Ising 스핀 유리 모델 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 180940/325007 | - |
dc.description.department | 한국과학기술원 : 물리학과, | - |
dc.identifier.uid | 000985043 | - |
dc.contributor.localauthor | Kim, Do-Hyun | - |
dc.contributor.localauthor | 김도현 | - |
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