Controlling phase diagram of finite spin-1/2 chains by tuning boundary interactions

Presenting Author: Cheng Peng, Stanford University

We propose a construct of finite size quantum spin-1/2 system, referred to as controllable spin wire (CSW), in which only Ising-type spin-spin interactions with a transverse field in the bulk, and multiple spin couplings as well as canted fields on the boundaries. The tunable Hamiltonians on the boundaries, we call them tuning Hamiltonians (TH’s), are used for determing physical properties in the bulk, including energy/entanglement spectrums, entanglement entropy, and magnetization. The CSW contains only nearest-neighboring interactions, which could be easily realized in artificial quantum circuits. Last but not least, we provides a possible scheme of studying infinite spin systems with only moderate CSW system.

Read this article online: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.085111

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