تقرير
Gauge fermions with flat bands and anomalous transport via chiral modes from breaking gauge symmetry
| العنوان: | Gauge fermions with flat bands and anomalous transport via chiral modes from breaking gauge symmetry |
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| المؤلفون: | Luo, Xi, Yu, Yue |
| سنة النشر: | 2016 |
| المجموعة: | Condensed Matter High Energy Physics - Theory |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, High Energy Physics - Theory |
| الوصف: | The dispersionless longitudinal photon in Maxwell theory is thought of as a redundant degree of freedom due to the gauge symmetry. We find that when there exist exactly flat bands with zero energy in a condensed matter system, the fermion field may locally transform as a gauge field and the system possesses a gauge symmetry. As the longitudinal photon, the redundant degrees of freedom from the flat bands must be gauged away from the physical states. As an example, we study spinless fermions on a generalized Lieb lattice in three dimensions. The flat band of the longitudinal fermion induces a gauge symmetry. An external magnetic field breaks this gauge symmetry and emerges a bunch of non-topologically chiral modes. Combining these emergent chiral modes with the chiral anomaly mode which is of an opposite chirality, rich anomalous electric transport phenomena exhibit and are expected to be observed in Pd$_3$Bi$_2$S$_2$ and Ag$_3$Se$_2$Au. Comment: 5 pages, 3 figures, minor revision, references added |
| نوع الوثيقة: | Working Paper |
| الوصول الحر: | http://arxiv.org/abs/1611.09653Test |
| رقم الانضمام: | edsarx.1611.09653 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |