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    Title: 量子物質奇異相態之模擬研究
    Other Titles: Simulating Exotic Phases of Quantum Matter
    Authors: 林瑜琤
    Contributors: 應用物理研究所
    Keywords: 非Landau-Ginzburg 型的量子相變;非局限的量子臨界點;量子自旋系統;拓 樸量子糾纏熵;共價鍵固態
    quantum phase transition beyond the Landau-Ginzburg-Wilson theory;deconfined quantum criticality;quantum spin systems;topological entanglement entropy;valence bond solids
    Date: 2013
    Issue Date: 2016-04-20 17:13:50 (UTC+8)
    Abstract: 強關聯物質中的量子效應可能引起一些不尋常的量子態及不能被Landau-Ginzburg 理論所解釋的量子相變。描述這些奇異量子相態的自然變量似乎不再是序參數,而是分 數自由度和拓樸序。因強量子起伏使得一些近似的解析方法失去可靠性,數值方法已成 為研討奇異量子態的必備工具。此研究計畫旨在藉大規模的數值模擬找出強關聯系統中 奇異量子現象的隱藏微觀機制,其中我們首強調量子自旋系統的模擬。
    Strong quantum effects in correlated materials can give rise to unusual quantum states of matter and quantum phase transitions that are not described by the standard Landau-Ginzburg paradigms. Instead of the order parameters, the natural variables to discuss these exotic quantum states and phase transitions are fractional degrees of freedom and topological order. Numerical methods are essential for our understanding of these exotic phases since the strong quantum fluctuations make approximate analytical treatments, such as mean-field theory, unreliable. The purpose of this research project is to find and characterize the microscopic mechanisms behind the variety of exotic phenomena observed in strongly-correlated matter, by performing large-scale simulations on model systems, primarily quantum spin systems.
    Relation: 計畫編號 NSC 101-2112-M004-005-MY3
    Data Type: report
    Appears in Collections:[應用物理研究所 ] 國科會研究計畫

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