Second harmonic generation as a probe of broken mirror symmetry

被引：16

作者：

Fichera, Bryan T. ^{[1
]}

Kogar, Anshul ^{[1
]}

Ye, Linda ^{[1
]}

Gokce, Bilal ^{[1
,2
,3
]}

Zong, Alfred ^{[1
]}

Checkelsky, Joseph G. ^{[1
]}

Gedik, Nuh ^{[1
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] Univ Duisburg Essen, Tech Chem 1, D-45141 Essen, Germany

[3] Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, D-45141 Essen, Germany

来源：

PHYSICAL REVIEW B | 2020年 / 101卷 / 24期

关键词：

CHARGE-DENSITY WAVES; COMMENSURATE PHASE; TRANSITION;

D O I：

10.1103/PhysRevB.101.241106

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The notion of spontaneous symmetry breaking has been used to describe phase transitions in a variety of physical systems. In crystalline solids, the breaking of certain symmetries, such as mirror symmetry, is difficult to detect unambiguously. Using 1T-TaS2, we demonstrate here that rotational-anisotropy second harmonic generation (RA-SHG) is not only a sensitive technique for the detection of broken mirror symmetry, but also that it can differentiate between mirror symmetry-broken structures of opposite planar chirality. We also show that our analysis is applicable to a wide class of different materials with mirror symmetry-breaking transitions. Lastly, we find evidence for bulk mirror symmetry-breaking in the incommensurate charge density wave phase of 1T-TaS2. Our results pave the way for RA-SHG to probe candidate materials where broken mirror symmetry may play a pivotal role.

引用

页数：5

共 31 条

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[2]

Belinicher V. I., 1980, Soviet Physics - Uspekhi, V23, P199, DOI 10.1070/PU1980v023n03ABEH004703

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