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• W2950489251 abstract "We find that the first-order quantum phase transitions (QPTs) are characterized by intrinsic jumps of relevant operators while the continuous ones are not. Based on such an observation, we propose a bond reversal method where a quantity $mathcal{D}$, the difference of bond strength (DBS), is introduced to judge whether or not a QPT is of first order. This method is first applied to an exactly solvable spin-$1/2$ XXZ Heisenberg chain and a quantum Ising chain with a longitudinal field where distinct jumps of $mathcal{D}$ appear at the first-order transition points for both cases. We then use it to study the topological QPT of a cross-coupled (${J}_{ifmmodetimeselsetexttimesfi{}}$) spin ladder where the Haldane--rung-singlet transition switches from being continuous to exhibiting a first-order character at ${J}_{ifmmodetimeselsetexttimesfi{},I}ensuremath{simeq}0.30(2)$. Finally, we study a recently proposed one-dimensional analogy of a deconfined quantum critical point connecting two ordered phases in a spin-$1/2$ chain. We rule out the possibility of a weakly first-order QPT because the DBS is smooth when crossing the transition point. Moreover, we affirm that such a transition belongs to the Gaussian universality class with a central charge $c=1$." @default.
• W2950489251 created "2019-06-27" @default.
• W2950489251 creator A5033309103 @default.
• W2950489251 creator A5071001963 @default.
• W2950489251 creator A5076591687 @default.
• W2950489251 date "2019-09-26" @default.
• W2950489251 modified "2023-10-14" @default.
• W2950489251 title "Intrinsic jump character of first-order quantum phase transitions" @default.
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• W2950489251 doi "https://doi.org/10.1103/physrevb.100.121111" @default.
• W2950489251 hasPublicationYear "2019" @default.
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