Glassiness and exotic entropy scaling induced by quantum fluctuations in a disorder-free frustrated magnet.
Glassiness and exotic entropy scaling induced by quantum fluctuations in a disorder-free frustrated magnet.
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DOI：
10.1038/ncomms4497
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发表时间：
2014-04-01
影响因子：
16.6
通讯作者：
Iida, K.
中科院分区：
文献类型：
--
作者：
Klich, I.;Lee, S-H;Iida, K.
当自旋排列在三角形点阵中时，阻挫现象导致大量能量等价的基态，并导致奇异态，如自旋液体和自旋冰。在这里，我们报告一个替代的情况：一个系统，经典的液体，冻结在干净的限制到一个玻璃态诱导量子涨落。我们称这种玻璃态为自旋干扰。这方面的例子是一个受抑磁铁，其中自旋排列在一个三角形网络的双金字塔。量子修正打破了经典的简并成一组非周期性的自旋配置形成局部极小在崎岖的能源景观。这是通过将问题映射为具有六边形瓦片的瓦片来建立的。镶嵌的数量与边界长度而不是其体积成比例，显示了局部零能量模式的存在。讨论了低温热力学，并与其它玻璃态材料进行了比较。 自旋液体和自旋冰是在晶格上排列的自旋具有能量接近的几个状态时出现的，这种现象称为挫折。在这里，Klich等人表明量子涨落可以诱导自旋液体冻结成玻璃态。
When spins are arranged in a lattice of triangular motif, the phenomenon of frustration leads to numerous energetically equivalent ground states, and results in exotic states such as spin liquid and spin ice. Here we report an alternative situation: a system, classically a liquid, freezes in the clean limit into a glassy state induced by quantum fluctuations. We call such glassy state a spin jam. The case in point is a frustrated magnet, where spins are arranged in a triangular network of bipyramids. Quantum corrections break the classical degeneracy into a set of aperiodic spin configurations forming local minima in a rugged energy landscape. This is established by mapping the problem into tiling with hexagonal tiles. The number of tessellations scales with the boundary length rather than its volume, showing the absence of local zero-energy modes. Low-temperature thermodynamics is discussed to compare it with other glassy materials. Spin liquids and spin ices arise when spins arranged on a lattice have several states that are close in energy, a phenomenon referred to as frustration. Here, Klich et al. show that quantum fluctuations can induce a spin liquid to freeze into a glassy state.
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影响因子：
3.7
作者：
HALPERIN, BI;SASLOW, WM
通讯作者：
SASLOW, WM
影响因子：
0.8
作者：
Bono, D;Limot, L;Blanchard, N
通讯作者：
Blanchard, N
影响因子：
4.4
作者：
Jack, RL;Garrahan, JP
通讯作者：
Garrahan, JP
影响因子：
3
作者：
Bekenstein, JD
通讯作者：
Bekenstein, JD
DOI：
10.1073/pnas.84.21.7524
发表时间：
1987-11-01
影响因子：
11.1
作者：
BRYNGELSON, JD;WOLYNES, PG
通讯作者：
WOLYNES, PG