Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Chichinadze, Dmitry"'
Autor:
Chichinadze, Dmitry V., Zhang, Naiyuan James, Lin, Jiang-Xiazi, Wang, Xiaoyu, Watanabe, Kenji, Taniguchi, Takashi, Vafek, Oskar, Li, J. I. A.
In a system of two-dimensional electrons, a combination of broken symmetry, interactions, and nontrivial topology can conspire to give rise to a nonlinear transport regime, where electric current density scales as the square of electric field. This r
Externí odkaz:
http://arxiv.org/abs/2411.11156
Publikováno v:
Phys. Rev. B 110, 184509 (2024)
We identify a new mechanism for the intrinsic superconducting diode effect (SDE) in multiphase superconductors. Using a Ginzburg-Landau and a microscopic two-band model, we find phase transitions into a mixed phase with finite-momentum Cooper pairs a
Externí odkaz:
http://arxiv.org/abs/2406.14612
Publikováno v:
Phys. Rev. B 109, 155118 (2024)
We investigate the crossover from an ordinary van Hove singularity (OVHS) to a higher order van Hove singularity (HOVHS) in a model applicable to Bernal bilayer graphene and rhombohedral trilayer graphene in a displacement field. At small doping, the
Externí odkaz:
http://arxiv.org/abs/2401.12384
Autor:
Zhang, Naiyuan James, Lin, Jiang-Xiazi, Chichinadze, Dmitry V., Wang, Yibang, Watanabe, Kenji, Taniguchi, Takashi, Fu, Liang, Li, J. I. A.
The ability to identify and characterize spontaneous symmetry breaking is central to our understanding of 2D materials with strong correlation, such as the moir\'e flat bands in magic-angle twisted graphene bilayer and trilayer. In this work, we util
Externí odkaz:
http://arxiv.org/abs/2209.12964
Publikováno v:
npj Quantum Materials (2022) 7:114
Motivated by measurements of compressibility and STM spectra in twisted bilayer graphene, we analyze the pattern of symmetry breaking for itinerant fermions near a van Hove singularity. Making use of an approximate SU(4) symmetry of the Landau functi
Externí odkaz:
http://arxiv.org/abs/2206.10539
Autor:
Shaffer, Daniel, Chichinadze, Dmitry
Publikováno v:
Phys. Rev. B 106, 014502 (2022)
A lot of attention has been drawn to superconductivity in UTe$_2$, with suggestions of time-reversal symmetry breaking triplet chiral superconducting order parameter. The chirality of the order parameter has been attributed to an accidental near dege
Externí odkaz:
http://arxiv.org/abs/2202.11732
We study symmetry-broken phases in twisted bilayer graphene at small filling above charge neutrality and at Van Hove filling. We argue that the Landau functionals for the particle-hole order parameters at these fillings both have an approximate SU(4)
Externí odkaz:
http://arxiv.org/abs/2108.05334
Publikováno v:
Phys. Rev. B 102, 125120 (2020)
We analyze density-wave and Pomeranchuk orders in twisted bilayer graphene. This compliments our earlier analysis of the pairing instabilities. We assume that near half-filling of either conduction or valence band, the Fermi level is close to Van Hov
Externí odkaz:
http://arxiv.org/abs/2007.00871
Publikováno v:
Phys. Rev. B 101, 224513 (2020)
Twisted bilayer graphene displays insulating and superconducting phases caused by exceptional flattening of its lowest energy bands. Superconductivity with highest $T_c$ appears at hole and electron dopings, near half-filling for valence or conductio
Externí odkaz:
http://arxiv.org/abs/1910.07379
Publikováno v:
Phys. Rev. B 99, 024509 (2019)
We compute the specific heat $C(T)$ in an Fe-based superconductor with only hole pockets. We use a three-orbital/three pocket model with two smaller hole pockets made out of $d_{xz}$ and $d_{yz}$ orbitals and a larger pocket made out of $d_{xy}$ orbi
Externí odkaz:
http://arxiv.org/abs/1808.06224