Quantum phase transitions out of a Z2 x Z2 topological phase

被引：15

作者：

Jahromi, Saeed S. ^{[1
,2
]}

Masoudi, S. Farhad ^{[1
]}

Kargarian, Mehdi ^{[3
]}

Schmidt, Kai Phillip ^{[2
]}

机构：

[1] KN Toosi Univ Technol, Dept Phys, Tehran, Iran

[2] TU Dortmund, Lehrstuhl Theoret Phys I, D-44221 Dortmund, Germany

[3] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 21期

关键词：

TRIANGULAR LATTICE; HALL STATES; EXCITATIONS; DEGENERACY; ORDERS; MODEL;

D O I：

10.1103/PhysRevB.88.214411

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the low-energy spectral properties and robustness of the topological phase of color code, which is a quantum spin model for the aim of fault-tolerant quantum computation, in the presence of a uniform magnetic field or Ising interactions, using high-order series expansion and exact diagonalization. In a uniform magnetic field, we find first-order phase transitions in all field directions. In contrast, our results for the Ising interactions unveil that for strong enough Ising couplings, the Z(2) x Z(2) topological phase of color code breaks down to symmetry broken phases by first-or second-order phase transitions.

引用

页数：8

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