Quantum criticality and spin liquid phase in the Shastry-Sutherland model

Yang, Jianwei; Sandvik, Anders W.; Wang, Ling

doi:10.1103/physrevb.105.l060409

Cited by 40 publications

(90 citation statements)

References 67 publications

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“…Below 1.8 K, the FWHM in Fig. 3b rises sharply and The DQCP separates a line of first-order QPTs and a QSL [16]. The first-order DS-PS transition at H = 0 extends further up in T and terminates at an Ising critical point (green circle) [30].…”

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confidence: 96%

“…At the highest pressure, 2.4 GPa, 1/T 1 exhibits critical scaling for T between 0.2 and 2 K, indicating sufficient proximity to the DQCP for realizing the characteristic quantum-critical fan [44]. The lack of scaling at 2.1 GPa, and the stronger first-order signals, makes the scenario of first-order transitions with emergent symmetry induced by a nearby multi-critical DQCP [7,8,13,14,16] more likely than a line of generic DQCPs on the enitire PS-AFM boundary [1,36].…”

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confidence: 99%

“…The DQCP has long been associated with unconventional phenomena including fractional spinon excitations and deconfined gauge fluctuations [3][4][5], and further intensive investigation of the DQCP scenario has introduced emergent symmetries [6][7][8][9][10] and exotic firstorder transitions [11,12]. In a very recent scenario, the DQCP is multi-critical [13,14] and generically connected to a gapless quantum spin liquid (QSL) [15][16][17][18][19].…”

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confidence: 99%

“…The 2D S = 1/2 Heisenberg model with uniform frustrated interactions on square-lattice offers a more frequently studied close analogy to the SSM, though hosting a four-fold degenerate dimerized phase in place of the two-fold degenerate PS phase of the SSM. A QSL phase exists in an extended parameter space between the dimerized and AFM phases [15,19,[38][39][40] and terminates at a DQCP with emergent SO(5) symmetry [14,16,17]. Beyond the DQCP, the direct PS-AFM transition is expected to be first-order, with the coexistence state inheriting (and breaking) the emergent symmetry of the DQCP [7][8][9]14].…”

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confidence: 99%

“…Early calculations indicated a first-order PS-AFM transition in the SSM [26], but in more recent work a DQCP with emergent O(4) symmetry [from the O(3) AFM and scalar PS order parameters] was proposed [36]. Other works argued that interactions beyond the SSM are required for reaching the DQCP [10] and that the SSM as well hosts a gapless QSL between the PS and AFM phases [14,16,18].…”

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confidence: 99%

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Deconfined quantum criticality and emergent symmetry in SrCu2(BO3)2

Cui¹,

Liu²,

Lin³

et al. 2022

Preprint

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The deconfined quantum critical point (DQCP) represents a paradigm shift in theories of quantum matter, presenting a "beyond Landau" scenario for order-order transitions. Its experimental realization, however, has remained elusive. Here we demonstrate by high-pressure 11 B NMR measurements on the quantum magnet SrCu2(BO3)2 that the magnetic field induced plaquette-singlet to antiferromagnetic transition above 1.8 GPa is proximate to a DQCP. We find a weak first-order transition between the two phases at a remarkably low temperature, Tc 0.07 K. Above Tc we observe quantum critical scaling at the highest pressure, 2.4 GPa. We explain the low first-order Tc values by a DQCP-induced emergent O(3) symmetry that is broken in the coexistence state. Our findings take the DQCP from a theoretical concept to a concrete experimental platform.

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confidence: 96%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Deconfined quantum criticality and emergent symmetry in SrCu2(BO3)2

Cui¹,

Liu²,

Lin³

et al. 2022

Preprint

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Competing orders, the Wess-Zumino-Witten term, and spin liquids

Huang

Lee

2023

Nuclear Physics B

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Discovery of quantum phases in the Shastry-Sutherland compound SrCu2(BO3)2 under extreme conditions of field and pressure

et al. 2022

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The 2-dimensional layered oxide material SrCu2(BO3)2, long studied as a realization of the Shastry-Sutherland spin topology, exhibits a range of intriguing physics as a function of both hydrostatic pressure and magnetic field, with a still debated intermediate plaquette phase appearing at approximately 20 kbar and a possible deconfined critical point at higher pressure. Here, we employ a tunnel diode oscillator (TDO) technique to probe the behavior in the combined extreme conditions of high pressure, high magnetic field, and low temperature. We reveal an extensive phase space consisting of multiple magnetic analogs of the elusive supersolid phase and a magnetization plateau. In particular, a 10 × 2 supersolid and a 1/5 plateau, identified by infinite Projected Entangled Pair States (iPEPS) calculations, are found to rely on the presence of both magnetic and non-magnetic particles in the sea of dimer singlets. These states are best understood as descendants of the full-plaquette phase, the leading candidate for the intermediate phase of SrCu2(BO3)2.

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Quantum criticality and spin liquid phase in the Shastry-Sutherland model

Cited by 40 publications

References 67 publications

Deconfined quantum criticality and emergent symmetry in SrCu2(BO3)2

Deconfined quantum criticality and emergent symmetry in SrCu2(BO3)2

Competing orders, the Wess-Zumino-Witten term, and spin liquids

Discovery of quantum phases in the Shastry-Sutherland compound SrCu2(BO3)2 under extreme conditions of field and pressure

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