Related Experiment Video
Updated: Jun 3, 2026
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
From underdoped to overdoped cuprates: two quantum phase transitions
S G Ovchinnikov1, E I Shneyder, M M Korshunov
1L V Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, 660036 Krasnoyarsk, Russia.
Summary
This study reveals two quantum phase transitions (QPTs) in high-temperature cuprates, linked to Fermi surface topology changes. These findings challenge existing models of critical points in the cuprate phase diagram.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- High-temperature cuprates exhibit complex phase diagrams with distinct underdoped and overdoped regions.
- Existing research suggests a critical point, but proposals regarding its concentration and origin vary.
- Two main hypotheses exist: one linked to pseudogap formation (p≈0.2) and another to Hall effect measurements at optimal doping (p(opt)≈0.16).
Purpose of the Study:
- To precisely calculate the density of states in high-temperature cuprates.
- To identify and characterize the quantum phase transitions (QPTs) within the cuprate phase diagram.
- To determine the critical concentrations associated with changes in Fermi surface topology.
Main Methods:
- Precise density of states calculations.
- Analysis of Fermi surface topology changes upon doping.
- Theoretical modeling of quantum phase transitions.
Main Results:
- The study identified two distinct quantum phase transitions (QPTs).
- Two critical concentrations were determined, corresponding to changes in Fermi surface topology.
- These findings provide new insights into the complex phase diagram of high-temperature cuprates.
Conclusions:
- The existence of two QPTs, rather than a single critical point, is supported by density of states calculations.
- The critical concentrations are directly linked to alterations in the Fermi surface topology.
- This work offers a refined understanding of the electronic phase transitions in high-temperature cuprates.
More Related Videos
Related Concept Videos
02:39Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
02:33Phase Transitions: Sublimation and Deposition
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
02:31Phase Transitions
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
01:21Phase Transitions
A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
02:39Phase Transitions: Vaporization and Condensation
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
01:19Phase Diagram
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).