Fidelity approach: the misleading role of finite size level crossing of excited energies

• URL: http://arxiv.org/abs/2007.01186v1
• Date: Thu, 2 Jul 2020 15:19:46 GMT
• Title: Fidelity approach: the misleading role of finite size level crossing of excited energies
• Authors: Somayyeh Nemati, Fatemeh Khastehdel Fumani, Saeed Mahdavifar
• Abstract summary: We show that quantum fidelity can truly identify two quantum phase transitions of a one-dimensional spin-1/2 quantum Ising model with competing nearest and next-nearest neighbour interactions in a transverse magnetic field.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Here, we show that, although quantum fidelity can truly identify two quantum phase transitions of a one-dimensional spin-1/2 quantum Ising model with competing nearest and next-nearest neighbour interactions in a transverse magnetic field, it may not be a suitable approach for analyzing its ground-state phase diagram.

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