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Quantum phase transitions in holographic models of magnetism and superconductors

We study a holographic model realizing an "antiferromagnetic" phase in which a global SU(2) symmetry representing spin is broken down to a U(1) by the presence of a finite electric charge density.… Expand

Quantum criticality in heavy-fermion metals

- P. Gegenwart, Q. Si, F. Steglich
- Physics
- 13 December 2007

Quantum criticality describes the collective fluctuations of matter undergoing a second-order phase transition at zero temperature. Heavy-fermion metals have in recent years emerged as prototypical… Expand

Universally diverging Grüneisen parameter and the magnetocaloric effect close to quantum critical points.

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Locally critical quantum phase transitions in strongly correlated metals

- Q. Si, S. Rabello, K. Ingersent, J. L. Smith
- PhysicsNature
- 28 November 2000

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Orbital-selective Mott phase in multiorbital models for alkaline iron selenides K1-xFe2-ySe2.

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Fermi surface reconstruction and multiple quantum phase transitions in the antiferromagnet CeRhIn5

- L. Jiao, Ye Chen,
+15 authors H. Q. Yuan - PhysicsProceedings of the National Academy of Sciences
- 5 January 2015

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TOPICAL REVIEW: How do Fermi liquids get heavy and die?

- P. Coleman, C. Pépin, Q. Si, R. Ramazashvili
- Physics
- 1 May 2001

We discuss non-Fermi liquid and quantum critical behaviour in heavy-fermion materials, focusing on the mechanism by which the electron mass appears to diverge at the quantum critical point. We ask… Expand

Quantum criticality and global phase diagram of magnetic heavy fermions

- Q. Si
- Physics
- 1 December 2009

Quantum criticality describes the collective fluctuations of matter undergoing a second‐order phase transition at zero temperature. It is being discussed in a number of strongly correlated electron… Expand

Local fluctuations in quantum critical metals

- Q. Si, S. Rabello, K. Ingersent, L. Smith
- Physics
- 25 February 2002

We show that spatially local, yet low-energy, fluctuations can play an essential role in the physics of strongly correlated electron systems tuned to a quantum critical point. A detailed microscopic… Expand

High Temperature Superconductivity in Iron Pnictides and Chalcogenides

- Q. Si, R. Yu, E. Abrahams
- Physics
- 11 March 2016

Superconductivity develops in metals upon the formation of a coherent macroscopic quantum state of electron pairs. Iron pnictides and chalcogenides are materials that have high superconducting… Expand

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