Quantum manipulation of valleys in bilayer graphene

Wu, George; Lue, Ning-Yuan; Chen, Y. C.

doi:10.1103/physrevb.88.125422

Cited by 43 publications

(34 citation statements)

References 48 publications

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“…Conversely, an applied magnetic field breaks the SU (2) symmetry in favor of the CDW state and beyond a certain critical field B c , a "pseudo spin-flop" is observed where the ground state "flips" from the SC state to CDW order. This "pseudo spin-flop" was precisely observed in experiments performed under magnetic field, with a critical field B c ∼ 17T [9,13,123]. In particular, the ultrasound experiment [18] shows that the typical B versus T phase diagram in Fig.…”

Section: Figsupporting

confidence: 53%

Charge orders, magnetism and pairings in the cuprate superconductors

et al. 2016

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We review the recent developments in the field of cuprate superconductors with special focus on the recently observed charge order in the underdoped compounds. We introduce new theoretical developments following the study of the antiferromagnetic quantum critical point in two dimensions, in which preemptive orders in both charge and superconducting (SC) sectors emerge, that are in turn related by an SU(2) symmetry. We consider the implications of this proliferation of orders in the underdoped region, and provide a study of the type of fluctuations which characterize the SU(2) symmetry. We identify an intermediate energy scale where the SC fluctuations are dominant and argue that they are unstable towards the formation of a resonant excitonic state at the pseudogap temperature T (*). We discuss the implications of this scenario for a few key experiments.

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Section: Figsupporting

confidence: 53%

Charge orders, magnetism and pairings in the cuprate superconductors

et al. 2016

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“…Recent work on nickelate superlattices, spurred by predictions of potential superconductivity [21,22], showed that phase transitions [23][24][25] and electrical properties [26][27][28] can be controlled by dimensionality and interfacial constraints. It was also found that the orbital states can be strongly modified [29][30][31][32] and that magnetism can be induced [33][34][35] at nickelate interfaces. These results have shed light on methods to understand and control collective ordering in correlated systems using nickelate superlattices as an ideal testing ground.…”

Section: Introductionmentioning

confidence: 99%

Control of hidden ground-state order in NdNiO3 superlattices

Disa

Georgescu

Hart

et al. 2017

Phys. Rev. Materials

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The combination of charge and spin degrees of freedom with electronic correlations in condensed matter systems leads to a rich array of phenomena, such as magnetism, superconductivity, and novel conduction mechanisms. While such phenomena are observed in bulk materials, a richer array of behaviors becomes possible when these degrees of freedom are controlled in atomically layered heterostructures, where one can constrain dimensionality and impose interfacial boundary conditions. Here, we unlock a host of unique, hidden electronic and magnetic phase transitions in NdNiO 3 while approaching the two-dimensional (2D) limit, resulting from the differing influences of dimensional confinement and interfacial coupling. Most notably, we discover a new phase in fully 2D, single layer NdNiO 3 , in which all signatures of the bulk magnetic and charge ordering are found to vanish. In addition, for quasi two-dimensional layers down to a thickness of two unit cells, bulk-type ordering persists but separates from the onset of insulating behavior in a manner distinct from that found in the bulk or thin film nickelates. Using resonant x-ray spectroscopies, first-principles theory, and model calculations, we propose that the single layer phase suppression results from a new mechanism of interfacial electronic reconstruction based on ionicity differences across the interface, while the phase separation in multi-layer NdNiO 3 emerges due to enhanced 2D fluctuations. These findings provide insights into the intertwined mechanisms of charge and spin ordering in strongly correlated systems in reduced dimensions and illustrate the ability to use atomic layering to access hidden phases.

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“…The typical phase diagram of these compounds starts from an AF state at zero hole doping. Superconductivity appears above a hole doping level p 0.05 but (glassy-type) magnetic order persists at low temperature over some material-dependent doping range (typically up to p = 0.08 in YBa 2 Cu 3 O y [25] and refs. therein).…”

Section: Field-induced Charge Density Waves In Cuprates High Tc Smentioning

confidence: 99%

Nuclear magnetic resonance in high magnetic field: Application to condensed matter physics

Berthier

Horvatić

Julien

et al. 2017

Comptes Rendus. Physique

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In this review, we describe the potentialities offered by the nuclear magnetic resonance (NMR) technique to explore at a microscopic level new quantum states of condensed matter induced by high magnetic fields. We focus on experiments realised in resistive (up to 34 T) or hybrid (up to 45 T) magnets, which open a large access to these quantum phase transitions. After an introduction on NMR observable, we consider several topics: quantum spin systems (spin-Peierls transition, spin ladders, spin nematic phases, magnetisation plateaus and Bose-Einstein condensation of triplet excitations), the field-induced charge density wave (CDW) in high Tc superconductors, and exotic superconductivity including the Fulde-Ferrel-Larkin-Ovchinnikov superconducting state and the field-induced superconductivity due to the Jaccarino-Peter mechanism. J 3 H m z B J || H c H s spin gap J J || S = 0 S = 1 J J3D k B T

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Quantum manipulation of valleys in bilayer graphene

Cited by 43 publications

References 48 publications

Charge orders, magnetism and pairings in the cuprate superconductors

Charge orders, magnetism and pairings in the cuprate superconductors

Control of hidden ground-state order in NdNiO3 superlattices

Nuclear magnetic resonance in high magnetic field: Application to condensed matter physics

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