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Publications Influence

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

695 15- PDF

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

137 15- PDF

Locally critical quantum phase transitions in strongly correlated metals

- Q. Si, S. Rabello, K. Ingersent, J. Smith
- Physics, Medicine
- Nature
- 28 November 2000

When a metal undergoes a continuous quantum phase transition, non-Fermi-liquid behaviour arises near the critical point. All the low-energy degrees of freedom induced by quantum criticality are… Expand

612 12- PDF

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

At a generic quantum critical point, the thermal expansion alpha is more singular than the specific heat c(p). Consequently, the "Grüneisen ratio," Gamma=alpha/c(p), diverges. When scaling applies,… Expand

227 11- PDF

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

We study a multiorbital model for the alkaline iron selenides K(1-x)Fe(2-y)Se(2) using a slave-spin method. With or without ordered vacancies, we identify a metal-to-Mott-insulator transition at the… Expand

95 5- PDF

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

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

Significance Conventional, thermally driven continuous phase transitions are described by universal critical behavior that is independent of microscopic details of a specific material. An analogous… Expand

51 5- PDF

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

101 5- PDF

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

66 5- PDF

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

- P. Coleman, C. P'epin, 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

203 4- PDF

High Temperature Superconductivity in Iron Pnictides and Chalcogenides

- Q. Si, R. Yu, E. Abrahams
- Physics, Materials Science
- 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

229 4- PDF