Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Ingersent, Kevin"'
Metallic quantum criticality is a central theme in a variety of strongly correlated systems. Recent experiments have raised the fundamental question of how the charge response can be singular in cases where the Landau framework of quantum criticality
Externí odkaz:
http://arxiv.org/abs/2206.01174
Autor:
Wu, Ang-Kun, Bauernfeind, Daniel, Cao, Xiaodong, Gopalakrishnan, Sarang, Ingersent, Kevin, Pixley, J. H.
The Anderson model for a magnetic impurity in a one-dimensional quasicrystal is studied using the numerical renormalization group (NRG). The main focus is elucidating the physics at the critical point of the Aubry-Andre (AA) Hamiltonian, which exhibi
Externí odkaz:
http://arxiv.org/abs/2205.06264
Autor:
Hu, Haoyu, Cai, Ang, Chen, Lei, Deng, Lili, Pixley, Jedediah H., Ingersent, Kevin, Si, Qimiao
In quantum materials, electrons that have strong correlations tend to localize, leading to quantum spins as the building blocks for low-energy physics. When strongly correlated electrons coexist with more weakly-correlated conduction electrons, multi
Externí odkaz:
http://arxiv.org/abs/2109.13224
Quantum criticality in certain heavy-fermion metals is believed to go beyond the Landau framework of order-parameter fluctuations. In particular, there is considerable evidence for Kondo destruction: a disappearance of the static Kondo singlet amplit
Externí odkaz:
http://arxiv.org/abs/1904.11471
Publikováno v:
Phys. Rev. B 99, 195410 (2019)
Kondo physics in doped monolayer graphene is predicted to exhibit unusual features due to the linear vanishing of the pristine material's density of states at the Dirac point. Despite several attempts, conclusive experimental observation of the pheno
Externí odkaz:
http://arxiv.org/abs/1808.08285
Publikováno v:
Phys. Rev. Lett. 121, 147602 (2018)
The numerical renormalization group is used to study quantum entanglement in the Kondo impurity model with a pseudogapped density of states $\rho(\varepsilon)\propto|\varepsilon|^r$ ($r>0$) that vanishes at the Fermi energy $\varepsilon=0$. The model
Externí odkaz:
http://arxiv.org/abs/1803.07583
Publikováno v:
Phys. Rev. B 96, 045103 (2017)
We use the poor man's scaling approach to study the phase boundaries of a pair of quantum impurity models featuring a power-law density of states $\rho(\omega)\propto|\omega|^r$ that gives rise to quantum phase transitions between local-moment and Ko
Externí odkaz:
http://arxiv.org/abs/1702.06515
Publikováno v:
Phys. Rev. B 101, 014452 (2020)
The appearance of unconventional superconductivity near heavy-fermion quantum critical points (QCPs) motivates investigation of pairing correlations close to a ``beyond Landau'' Kondo-destruction QCP. We focus on a two-Anderson-impurity cluster in wh
Externí odkaz:
http://arxiv.org/abs/1604.06449
Recent studies of heavy-fermion systems with tunable quantum fluctuations have focused on a variety of zero-temperature phase transitions that involve not only the onset of magnetic order but also the destruction of Kondo entanglement. Motivated by t
Externí odkaz:
http://arxiv.org/abs/1603.03829
Publikováno v:
Phys. Rev. B 93, 075148 (2016)
An Anderson model for a magnetic impurity in a two-dimensional electron gas with bulk Rashba spin-orbit interaction is solved using the numerical renormalization group under two different experimental scenarios. For a fixed Fermi energy, the Kondo te
Externí odkaz:
http://arxiv.org/abs/1509.08433