Miserev, Dmitry and Loss, Daniel and Klinovaja, Jelena. (2022) Instability of the ferromagnetic quantum critical point and symmetry of the ferromagnetic ground state in twodimensional and threedimensional electron gases with arbitrary spinorbit splitting. Physical review B: Condensed matter and materials physics, 106 (13). p. 134417.

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Official URL: https://edoc.unibas.ch/92107/
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Abstract
It is well known that in the absence of the spinorbit (SO) splitting the zerotemperature ferromagnetic phase transition in twodimensional (2D) and threedimensional (3D) electron gas is discontinuous (first order). The physical reason for this effect lies in the infrared catastrophe brought by the longrange particlehole fluctuations near the Fermi surface. It is widely believed that a finite SO splitting is able to regularize this infrared catastrophe, and therefore, to stabilize the ferromagnetic quantum critical point. In contrast to this, we show that the infrared catastrophe persists at arbitrary SO splitting and the zerotemperature ferromagnetic phase transition in the itinerant 2D and 3D electron gas is always discontinuous. We also find that SO splitting reduces the symmetry of the ferromagnetic ground state down to the symmetry of the spinorbit term. For example, Rashba SO splitting in 2D electron gas leads to the easyplane symmetry of the ferromagnetic ground state. A combination of the Rashba SO splitting with the Dresselhaus term reduces the symmetry of the ferromagnetic ground state down to the inplane Ising ferromagnet. The infrared catastrophe can be measured via the nonanalytic dependence of the spin susceptibility on magnetic field. This dependence is strongly anisotropic and follows the symmetry of SO splitting.
Faculties and Departments:  05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja) 

UniBasel Contributors:  Klinovaja, Jelena and Loss, Daniel 
Item Type:  Article, refereed 
Article Subtype:  Research Article 
Publisher:  American Physical Society 
ISSN:  10980121 
eISSN:  1550235X 
Note:  Publication type according to Uni Basel Research Database: Journal article 
Language:  English 
Identification Number:  
edoc DOI:  
Last Modified:  07 Feb 2023 04:10 
Deposited On:  01 Feb 2023 10:25 
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