Applied Physics Letters

... leads to a significantly larger modulation of the enhancements. The observed enhancement correlates with the changes in the Fermi level of graphene, indicating that the enhancement is chemical in nature, as electromagnetic enhancement is ruled out by hybrid electrodynamical and quantum mechanical C ...

... leads to a significantly larger modulation of the enhancements. The observed enhancement correlates with the changes in the Fermi level of graphene, indicating that the enhancement is chemical in nature, as electromagnetic enhancement is ruled out by hybrid electrodynamical and quantum mechanical C ...

Recent developments in transport phenomena in Weyl semimetals

... space. Since all three Pauli matrices have been used up in H Weyl , there is no matrix that anticommutes with H Weyl and gaps out the spectrum. There are then only two ways a Weyl point can be destroyed perturbatively.1 The ﬁrst is by annihilating it with another Weyl point of opposite chirality, ei ...

... space. Since all three Pauli matrices have been used up in H Weyl , there is no matrix that anticommutes with H Weyl and gaps out the spectrum. There are then only two ways a Weyl point can be destroyed perturbatively.1 The ﬁrst is by annihilating it with another Weyl point of opposite chirality, ei ...

Paper

... densities required [9]. When Feshbach resonances were explored in bosonic systems, strong interactions were always accompanied by strong losses, preventing the study of strongly interacting condensates [7, 10, 11]. The reason is that a Feshbach resonance couples the atomic Hilbert space to a resonan ...

... densities required [9]. When Feshbach resonances were explored in bosonic systems, strong interactions were always accompanied by strong losses, preventing the study of strongly interacting condensates [7, 10, 11]. The reason is that a Feshbach resonance couples the atomic Hilbert space to a resonan ...

Theory of ultracold atomic Fermi gases

... Kosterlitz-Thouless phase transition in 2D configurations 共Hadzibabic et al., 2006; Schweikhard et al., 2007兲. On the theoretical side, the first efforts were devoted to implementing the Gross-Pitaevskii theory of weakly interacting Bose gases in the presence of the trapping conditions of experiment ...

... Kosterlitz-Thouless phase transition in 2D configurations 共Hadzibabic et al., 2006; Schweikhard et al., 2007兲. On the theoretical side, the first efforts were devoted to implementing the Gross-Pitaevskii theory of weakly interacting Bose gases in the presence of the trapping conditions of experiment ...

5. Dilution Cooling - Particle Physics

... is the condition that T TF . For electrons in metal, we have seen that the Fermi energy is much higher than kB T at room temperature. What is the Fermi temperature for helium-3 in the dilute phase? Is it still higher than the temperature we are interested in? At 6.6% concentration, and using the e ...

... is the condition that T TF . For electrons in metal, we have seen that the Fermi energy is much higher than kB T at room temperature. What is the Fermi temperature for helium-3 in the dilute phase? Is it still higher than the temperature we are interested in? At 6.6% concentration, and using the e ...

Photoemission Spectroscopy of a Strongly Interacting Fermi Gas

... and for being a great dad. I know you became a lawyer (I blame Harvard), but I’m sure you could easily have been a great scientist in another life. I’d like to thank my Gramps for being a wonderful grandfather and for always being, at least to me, a model intellectual with great compassion and human ...

... and for being a great dad. I know you became a lawyer (I blame Harvard), but I’m sure you could easily have been a great scientist in another life. I’d like to thank my Gramps for being a wonderful grandfather and for always being, at least to me, a model intellectual with great compassion and human ...

the fermi liquid as a renormalization group fixed point

... Current interest in the physics of strongly correlated fermions [non-Fermi Liquids in d > 1] inspired a new wave of efforts aimed at clarifying the foundations of the Landau FLT and possible mechanisms of its breakdown. Let us mention only two approaches, which can be seen as sophisticated modern co ...

... Current interest in the physics of strongly correlated fermions [non-Fermi Liquids in d > 1] inspired a new wave of efforts aimed at clarifying the foundations of the Landau FLT and possible mechanisms of its breakdown. Let us mention only two approaches, which can be seen as sophisticated modern co ...

87, 063618 (2013)

... two-dimensional cold fermion systems support the Majorana fermions in the order parameter defects (but are otherwise completely gapped in the bulk), the corresponding threedimensional systems have topologically protected gapless nodes in the bulk supporting the relativistic Weyl fermion excitations. ...

... two-dimensional cold fermion systems support the Majorana fermions in the order parameter defects (but are otherwise completely gapped in the bulk), the corresponding threedimensional systems have topologically protected gapless nodes in the bulk supporting the relativistic Weyl fermion excitations. ...

Real-time evolution for weak interaction quenches in quantum systems

... prevent a wipe-out of the inﬂuence of the initial conditions such that thermalization with respect to a conventional Gibbs ensemble should not be expected. In analogy to equilibrium approaches [39], it was suggested that the long-time behavior can be reproduced by a statistical description based on ...

... prevent a wipe-out of the inﬂuence of the initial conditions such that thermalization with respect to a conventional Gibbs ensemble should not be expected. In analogy to equilibrium approaches [39], it was suggested that the long-time behavior can be reproduced by a statistical description based on ...

quantum simulations on square and triangular hubbard models

... cannot describe a complete physics of real materials, at least it captures the dominant physics of our interests. We will briey introduce the Hubbard model in the section 2.1. The numerical tool we use for the Hubbard model is the dynamical cluster approximation (DCA, section 2.2.3) with interactio ...

... cannot describe a complete physics of real materials, at least it captures the dominant physics of our interests. We will briey introduce the Hubbard model in the section 2.1. The numerical tool we use for the Hubbard model is the dynamical cluster approximation (DCA, section 2.2.3) with interactio ...

Electronic quasiparticles in the quantum dimer model: density matrix

... the coupling for the resonant term, and V is the coupling for the potential term. H1 contains the hopping terms of the fermionic dimers; t1 , t2 , and t3 correspond to three distinct types of hoppings. In the absence of the fermions, the undoped dimer model has an exactly solvable point (the RK poin ...

... the coupling for the resonant term, and V is the coupling for the potential term. H1 contains the hopping terms of the fermionic dimers; t1 , t2 , and t3 correspond to three distinct types of hoppings. In the absence of the fermions, the undoped dimer model has an exactly solvable point (the RK poin ...

Cooling and Trapping Neutral Atoms

... the disk as an atom mirror showed dispersive effects after reflection. ...

... the disk as an atom mirror showed dispersive effects after reflection. ...

Holographic non-Fermi

... Z −−−→ 0. Furthermore, the system’s resistivity exhibits a linear temperature dependence in sharp contrast to the quadratic dependence of a Fermi liquid. These anomalies, along with others, suggest that in the strange-metal phase, there is still a sharp Fermi surface, but no long-lived quasi-particl ...

... Z −−−→ 0. Furthermore, the system’s resistivity exhibits a linear temperature dependence in sharp contrast to the quadratic dependence of a Fermi liquid. These anomalies, along with others, suggest that in the strange-metal phase, there is still a sharp Fermi surface, but no long-lived quasi-particl ...

109, 105302 (2012)

... State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, Shanxi University, Taiyuan 030006, People’s Republic of China (Received 5 April 2012; published 5 September 2012) ...

... State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, Shanxi University, Taiyuan 030006, People’s Republic of China (Received 5 April 2012; published 5 September 2012) ...

TT 49: Transport: Topological Semimetals 2 (jointly with DS, MA, HL

... semimetals. It states that left- and right-handed fermions are not conserved individually, while their sum is. One of its experimental consequences is the negative magnetoresistance predicted in Weyl semimetals. Recent experiments show strong indications for such an anomalous conductivity response, ...

... semimetals. It states that left- and right-handed fermions are not conserved individually, while their sum is. One of its experimental consequences is the negative magnetoresistance predicted in Weyl semimetals. Recent experiments show strong indications for such an anomalous conductivity response, ...

MA 42: Transport: Topological Semimetals 2 (jointly with DS, MA, HL

... semimetals. It states that left- and right-handed fermions are not conserved individually, while their sum is. One of its experimental consequences is the negative magnetoresistance predicted in Weyl semimetals. Recent experiments show strong indications for such an anomalous conductivity response, ...

... semimetals. It states that left- and right-handed fermions are not conserved individually, while their sum is. One of its experimental consequences is the negative magnetoresistance predicted in Weyl semimetals. Recent experiments show strong indications for such an anomalous conductivity response, ...

University of Toronto Strongly Repulsive Ultracold

... that describes each particle (of dimension ℵ31 ), the full description of the quantum problem that is necessitated by the strong interactions and correlations requires a 3N dimensional continuous Hilbert space (of dimension ℵ3N 1 ). In essence, while in a non-interacting quantum system, one can solv ...

... that describes each particle (of dimension ℵ31 ), the full description of the quantum problem that is necessitated by the strong interactions and correlations requires a 3N dimensional continuous Hilbert space (of dimension ℵ3N 1 ). In essence, while in a non-interacting quantum system, one can solv ...

Orthogonal metals: The simplest non-Fermi liquids

... other discrete variable, for instance, a Zn rather than Ising, degree of freedom. In that case, the gauge redundancy is also Zn and the corresponding orthogonal metal is obtained when the slave spins are disordered, the fermions form a gapless Fermi surface, and the Zn gauge ﬁelds are gapped. For mo ...

... other discrete variable, for instance, a Zn rather than Ising, degree of freedom. In that case, the gauge redundancy is also Zn and the corresponding orthogonal metal is obtained when the slave spins are disordered, the fermions form a gapless Fermi surface, and the Zn gauge ﬁelds are gapped. For mo ...

Paper

... tween the two Fermi surfaces exceeds the energy gained from pairing – the so-called Chandrasekhar– Clogston (CC) limit of superconductivity. The issue of pairing and fermionic superfluidity in an imbalanced Fermi mixture has intrigued physicists for many decades. Although a population imbalance can ...

... tween the two Fermi surfaces exceeds the energy gained from pairing – the so-called Chandrasekhar– Clogston (CC) limit of superconductivity. The issue of pairing and fermionic superfluidity in an imbalanced Fermi mixture has intrigued physicists for many decades. Although a population imbalance can ...

4, 2710 (2013)

... Chunlei Qu1,*, Zhen Zheng2,*, Ming Gong3, Yong Xu1, Li Mao1, Xubo Zou2, Guangcan Guo2 & Chuanwei Zhang1 ...

... Chunlei Qu1,*, Zhen Zheng2,*, Ming Gong3, Yong Xu1, Li Mao1, Xubo Zou2, Guangcan Guo2 & Chuanwei Zhang1 ...

5.7. time-reversal symmetry for spin-1/2 and Kramers

... Consider the 3D BZ of a 3D insulator. Now, we consider constant kz planes. We can consider each constant kz plane as a 2D system. For most constant kz planes, they are not time-revers ally invariant 2D systems, because kz kz under time-reversal. However, the kz 0 and kz planes are time-re ...

... Consider the 3D BZ of a 3D insulator. Now, we consider constant kz planes. We can consider each constant kz plane as a 2D system. For most constant kz planes, they are not time-revers ally invariant 2D systems, because kz kz under time-reversal. However, the kz 0 and kz planes are time-re ...

Teaching Theoretical Physics: the cases of Enrico Fermi and Ettore

... January 20, 1927 he gave his first lecture on Theoretical Physics in Rome1. Noticeably, his course was annotated by Carlo Dei and Leonardo Martinozzi and then published [3]; the record book reporting the content of Fermi’s lectures is available as well, kept at the Archives of the University of Rome ...

... January 20, 1927 he gave his first lecture on Theoretical Physics in Rome1. Noticeably, his course was annotated by Carlo Dei and Leonardo Martinozzi and then published [3]; the record book reporting the content of Fermi’s lectures is available as well, kept at the Archives of the University of Rome ...

Landau`s Fermi Liquid Theory

... The free, i.e. non-interacting, Fermi gas give basic understanding of both cold Fermi systems. In particular, adding neutralizing or confining potentials it gives a qualitative understanding of Specific heat of (many) metals at low temperature The formation of neutron stars Adding a periodic potenti ...

... The free, i.e. non-interacting, Fermi gas give basic understanding of both cold Fermi systems. In particular, adding neutralizing or confining potentials it gives a qualitative understanding of Specific heat of (many) metals at low temperature The formation of neutron stars Adding a periodic potenti ...

# Enrico Fermi

Enrico Fermi (Italian: [enˈriko ˈfermi]; 29 September 1901 – 28 November 1954) was an Italian physicist, who is credited with the creation of the first nuclear reactor, the Chicago Pile-1. He made significant contributions to the development of quantum theory, nuclear and particle physics, and statistical mechanics. He is one of the men referred to as the ""architect and father of the atomic bomb"". Fermi held several patents related to the use of nuclear power, and was awarded the 1938 Nobel Prize in Physics for his work on induced radioactivity by neutron bombardment and the discovery of transuranic elements. He was widely regarded as one of the very few physicists to excel both theoretically and experimentally.Fermi's first major contribution was to statistical mechanics. After Wolfgang Pauli announced his exclusion principle in 1925, Fermi followed with a paper in which he applied the principle to an ideal gas, employing a statistical formulation now known as Fermi–Dirac statistics. Today, particles that obey the exclusion principle are called ""fermions"". Later Pauli postulated the existence of an uncharged invisible particle emitted along with an electron during beta decay, to satisfy the law of conservation of energy. Fermi took up this idea, developing a model that incorporated the postulated particle, which he named the ""neutrino"". His theory, later referred to as Fermi's interaction and still later as weak interaction, described one of the four fundamental forces of nature. Through experiments inducing radioactivity with recently discovered neutrons, Fermi discovered that slow neutrons were more easily captured than fast ones, and developed the Fermi age equation to describe this. After bombarding thorium and uranium with slow neutrons, he concluded that he had created new elements; although he was awarded the Nobel Prize for this discovery, the new elements were subsequently revealed to be fission products.Fermi left Italy in 1938 to escape new Italian Racial Laws that affected his Jewish wife Laura. He emigrated to the United States where he worked on the Manhattan Project during World War II. Fermi led the team that designed and built Chicago Pile-1, which went critical on 2 December 1942, demonstrating the first artificial self-sustaining nuclear chain reaction. He was on hand when the X-10 Graphite Reactor at Oak Ridge, Tennessee, went critical in 1943, and when the B Reactor at the Hanford Site did so the next year. At Los Alamos he headed F Division, part of which worked on Edward Teller's thermonuclear ""Super"" bomb. He was present at the Trinity test on 16 July 1945, where he used his Fermi method to estimate the bomb's yield.After the war, Fermi served under J. Robert Oppenheimer on the influential General Advisory Committee, which advised the Atomic Energy Commission on nuclear matters and policy. Following the detonation of the first Soviet fission bomb in August 1949, he strongly opposed the development of a hydrogen bomb on both moral and technical grounds. He was among the scientists who testified on Oppenheimer's behalf at the 1954 hearing that resulted in the denial of the latter's security clearance. Fermi did important work in particle physics, especially related to pions and muons, and he speculated that cosmic rays arose through material being accelerated by magnetic fields in interstellar space. Many awards, concepts, and institutions are named after Fermi, including the Enrico Fermi Award, the Enrico Fermi Institute, the Fermi National Accelerator Laboratory, the Fermi Gamma-ray Space Telescope, the Enrico Fermi Nuclear Generating Station, and the synthetic element fermium (one of just over a dozen elements named after people).