Sensing Floquet-Majorana fermions via heat transfer

被引:28
|
作者
Molignini, Paolo [1 ]
van Nieuwenburg, Evert [1 ,2 ]
Chitra, R. [1 ]
机构
[1] Swiss Fed Inst Technol, Inst Theoret Phys, CH-8093 Zurich, Switzerland
[2] CALTECH, Inst Quantum Informat & Matter, 1200 E Calif Blvd, Pasadena, CA 91125 USA
基金
美国国家科学基金会; 瑞士国家科学基金会;
关键词
TOPOLOGICAL INSULATOR; QUANTUM; DEVICES; STATES;
D O I
10.1103/PhysRevB.96.125144
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Time periodic modulations of the transverse field in the closed XY spin-1 2 chain generate a very rich dynamical phase diagram, with a hierarchy ofZn topological phases characterized by differing numbers of Floquet-Majorana modes. This rich phase diagram survives when the system is coupled to dissipative end reservoirs. Circumventing the obstacle of preparing and measuring quasienergy configurations endemic to Floquet-Majorana detection schemes, we show that stroboscopic heat transport and spin density are robust observables to detect both the dynamical phase transitions andMajorana modes in dissipative settings. We find that the heat current provides very clear signatures of these Floquet topological phase transitions. In particular, we observe that the derivative of the heat current, with respect to a control parameter, changes sign at the boundaries separating topological phaseswith differing nonzero numbers of Floquet-Majorana modes. We present a simple scheme to directly count the number of Floquet-Majorana modes in a phase from the Fourier transform of the local spin density profile. Our results are valid provided the anisotropies are not strong and can be easily implemented in quantum engineered systems.
引用
收藏
页数:6
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