Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 56: Correlated Electrons: Quantum-Critical Phenomena

TT 56.6: Vortrag

Donnerstag, 19. März 2020, 10:45–11:00, HSZ 304

Deconfined critical point in a doped random quantum Heisenberg magnet — •Darshan Joshi, Chenyuan Li, and Subir Sachdev — Department of Physics, Harvard University, Cambridge MA 02138, USA

We study a t-J model with both t and J random and all-to-all. This model has been studied earlier [1], and can be mapped to an Anderson impurity coupled to self-consistent fermionic and bosonic baths. We employ renormalization group and large M (for models with SU(M) spin symmetry) analyses, and find evidence for a deconfined critical point at zero temperature and small doping. The critical spin correlations are similar to those in a random magnet [2]. A disordered Fermi liquid phase is expected at large doping, while a spin glass phase is expected at small doping. We note connections to the physics of the underdoped cuprates.

[1] O. Parcollet and A. Georges, Physical Review B 59, 5341 (1999).

[2] S. Sachdev and J. Ye, Physical Review Letters 70, 3339 (1993).

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