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Some Remarks on Superfluidity

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Some Remarks on Superfluidity
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340
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Although Felix Bloch participated in three Lindau Meetings, the only lecture he gave is the present one. This is a pity, not only for historians of science, but also for the audiences of young scientists that were not allowed to listen to this inspiring lecturer. Even though he was born (and died) in Zürich, Bloch spent most of his life in the US and delivered his lecture in the broken English that Niels Bohr has described as “the international language of physics”. But irrespective of language, Bloch clearly shows that he has been an active teacher with a straightforward pedagogical approach. What he gives the audience is nothing less than a 45-minute lesson in quantum mechanics as applied to a macroscopic amount of superfluid rotating in a ring container, something like a donut, at the absolute zero of temperature. Superfluidity was discovered in liquid helium in the 1930’s and there is a whole zoo of strange effects appearing in this kind of system, such as quantization of rotation in a ring container. This topic is rather far from the work that Bloch received the Nobel Prize for in 1952 and also shows him not to be afraid to stick out his neck. This is so because one of the Nobel Laureates in the audience was Leon Cooper, a true specialist on this type of so-called macroscopic quantum phenomena, who had received the Nobel Prize in physics a few years earlier for a microscopic theory of superconductivity. Bloch delivers his lecture with transparencies, but also without them it is possible to follow it. According to a speech (which is available on Nobelprize.org) that he gave at the end of the Nobel Banquet 1952, thanking the university students for their felicitations, cheers and beautiful songs, his own students had “been a constant stimulus and a great source of inspiration” and the spirit of his young collaborators had “been an important factor in the success of our work.” Hear, hear, hear! Anders Bárány
Bloch, FelixMagnetismMusical developmentNuclear powerMeasurementKastler, AlfredModel buildingJosephson-KontaktSt. Louis CardinalsSizingAtomismCrystal habitOrder and disorder (physics)YearAngle of attackSuperconductivityPlane (tool)Telescopic sightCurrent densitySeparation processGasKnotPair productionScrew capWeightKardierenForceChemical substanceTemperatureBird vocalizationFACTS (newspaper)LiquidToolAnalog signalVisible spectrumEnergy levelHourAngeregter ZustandRailroad carFullingMetalKelvinRulerRadio jammingCartridge (firearms)ScoutingVolkswagen GolfColorfulnessCouchSelectivity (electronic)DrehmasseFocus (optics)Capital shipChannelingAlcohol proofLinear motorAtmospheric pressureIdeal gasTheodoliteHot workingCondenser (heat transfer)LightLambda baryonWireThin filmHyperbelnavigationModel buildingDirect currentVolumetric flow rateGround stationMeasuring instrumentParticleMeeting/Interview
Bloch, FelixNuclear powerKastler, AlfredModel buildingMusical developmentMagnetismMeasurementRail transport operationsPower (physics)ParticleMetreCartridge (firearms)H-alphaWind waveLiquidContrast (vision)Centre Party (Germany)Orbital periodHydrogen atomOrder and disorder (physics)Bird vocalizationZeitdiskretes SignalAtomismCosmic distance ladderRing (jewellery)TypesettingPhase (matter)TiefdruckgebietFACTS (newspaper)Spread spectrumGasFuelIPadDrehmasseLoudspeakerRulerFullingOrbitRail profileButtonSunriseAmplitudeColorfulnessTiefgangCylinder blockTurningSchwache LokalisationSizingHourAngeregter ZustandPionSpieltisch <Möbel>BackpackPair productionAngle of attackWeekAutumnEveningMultiplizitätHot isostatic pressingPagerSeparation processGentlemanMarble sculpture
Model buildingJosephson-KontaktBloch, FelixMagnetismMusical developmentNuclear powerMeasurementKastler, AlfredLiquidCapital shipCombined cycleLinear motorTypesettingVortexZeitdiskretes SignalOrder and disorder (physics)Phase (matter)Roll formingCoherence (signal processing)Color chargeAbsolute zeroAmmeterRemotely operated underwater vehicleFACTS (newspaper)DensitySpare partCartridge (firearms)Chemical substanceAtomismNoise figureCogenerationGravitational singularityContinental driftFahrgeschwindigkeitAngeregter ZustandMultiplizitätOrbital periodAlpha particleEnergiesparmodusZirkulatorYearVolumetric flow rateKelvinMassPlanck unitsFinger protocolPlant (control theory)AmplitudeVideoMoving walkwayTemperatureTelephoneMechanical fanStonewareFiling (metalworking)AutumnFoot (unit)CaliperRulerDrehmasseNorthrop Grumman B-2 SpiritFrictionHourSeparation processRelative articulationRailroad carTape recorderVisible spectrumAntenna diversityFlugbahnDirect currentAngle of attackMitsubishi A6M ZeroCardinal directionGirl (band)Ballpoint penGround stationToolMobile phone
Bloch, FelixModel buildingNuclear powerMagnetismMusical developmentMeasurementKastler, AlfredAtomismGasAngeregter ZustandTheodoliteCartridge (firearms)FACTS (newspaper)MeasurementSoundQuasiparticleParticleSteckverbinderVolumetric flow ratePhononProzessleittechnikNyquist stability criterionRoll formingLightCurrent densitySpeed of lightSeparation processSuperconductivityBookbindingGas turbineHose couplingSpeed of soundCasting defectFinishing (textiles)UniverseWavelengthAbsolute magnitudeSpare partGround stateZirkulatorAbsolute zeroOrder and disorder (physics)Composite materialMonthTurningFinger protocolStationeryHourDiesel engineIdeal gasKickstandMechanical fanEffects unitWeekDayBook designDrehmasseQuasarAngle of attackFullingNanotechnologyModel buildingMicroscopeThorns, spines, and pricklesStress (mechanics)FlightMorse codeWind farmScale (map)AutumnMeeting/Interview
Kastler, AlfredModel buildingBloch, FelixNuclear powerMagnetismMusical developmentMeasurementAlcohol proofAngeregter ZustandTemperatureSpare partZirkulatorAtomismRemotely operated underwater vehicleCasting defectSpeed of soundFACTS (newspaper)Contrast (vision)SoundRRS DiscoveryEnergy levelPartition of a setLiquidDirect currentBook designAbsolute zeroFahrgeschwindigkeitCartridge (firearms)Lambda baryonCooper (profession)TheodoliteCocktail party effectPhononNeutronScatteringH-alphaNatürliche RadioaktivitätStarMechanicFormation flyingPhononOrder and disorder (physics)Flavour (particle physics)FlugbahnMeasurementDensityGentlemanEngineDrehmassePitch (music)Vertical integrationAutumnSteckverbinderRefrigeratorBill of materialsMechanical fanElectronic mediaPlant (control theory)UniverseBusFord ExplorerWorkshopKelvinKritische MasseYearModel buildingNeutronenstreuungCabin (truck)SynthesizerBallpoint penSuperconductivityCurrent densityDayStock (firearms)TelephoneRutschungKontraktion
Bloch, FelixNuclear powerMusical developmentMagnetismMeasurementKastler, AlfredMeeting/Interview
Transcript: English(auto-generated)