Floquet Hopf Insulators

Thomas Schuster, Snir Gazit, Joel E. Moore, Norman Y. Yao

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

ملخص

We predict the existence of a Floquet topological insulator in three-dimensional two-band systems, the Floquet Hopf insulator, which possesses two distinct topological invariants. One is the Hopf Z invariant, a linking number characterizing the (nondriven) Hopf topological insulator. The second invariant is an intrinsically Floquet Z2 invariant, and represents a condensed matter realization of the topology underlying the Witten anomaly in particle physics. Both invariants arise from topological defects in the system's time evolution, subject to a process in which defects at different quasienergies exchange even amounts of topological charge. Their contrasting classifications lead to a measurable physical consequence, namely, an unusual bulk-boundary correspondence where gapless edge modes are topologically protected, but may exist at either 0 or π quasienergy. Our results represent a phase of matter beyond the conventional classification of Floquet topological insulators.

اللغة الأصليةإنجليزيّة أمريكيّة
رقم المقال266803
دوريةPhysical Review Letters
مستوى الصوت123
رقم الإصدار26
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 30 ديسمبر 2019

All Science Journal Classification (ASJC) codes

  • !!General Physics and Astronomy

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