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Published on: August 2, 2019
Communication: spin-boson model with diagonal and off-diagonal coupling to two independent baths: ground-state phase
Yang Zhao1, Yao Yao2, Vladimir Chernyak3
1Division of Materials Science, Nanyang Technological University, Singapore 639798, Singapore.
Abstract:
We investigate a spin-boson model with two boson baths that are coupled to two perpendicular components of the spin by employing the density matrix renormalization group method with an optimized boson basis. It is revealed that in the deep sub-Ohmic regime there exists a novel second-order phase transition between two types of doubly degenerate states, which is reduced to one of the usual types for nonzero tunneling. In addition, it is found that expectation values of the spin components display jumps at the phase boundary in the absence of bias and tunneling.
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