Spin-orbit density wave induced hidden topological order in URu2Si2

被引:38
作者
Das, Tanmoy [1 ,2 ]
机构
[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
[2] Northeastern Univ, Dept Phys, Boston, MA 02115 USA
来源
SCIENTIFIC REPORTS | 2012年 / 2卷
关键词
FERMI-SURFACE; EXCITATIONS; TRANSITION; MAGNETISM; PRESSURE; LATTICE; MOMENT; PHASE; FIELD; HEAT;
D O I
10.1038/srep00596
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The conventional order parameters in quantum matters are often characterized by 'spontaneous' broken symmetries. However, sometimes the broken symmetries may blend with the invariant symmetries to lead to mysterious emergent phases. The heavy fermion metal URu2Si2 is one such example, where the order parameter responsible for a second- order phase transition at T-h=17.5 K has remained a long- standing mystery. Here we propose via ab- initio calculation and effective model that a novel spin- orbit density wave in the f- states is responsible for the hidden- order phase in URu2Si2. The staggered spin- orbit order spontaneously breaks rotational, and translational symmetries while time- reversal symmetry remains intact. Thus it is immune to pressure, but can be destroyed by magnetic field even at T=0 K, that means at a quantum critical point. We compute topological index of the order parameter to show that the hidden order is topologically invariant. Finally, some verifiable predictions are presented.
引用
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页数:5
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